draft-ietf-sipping-pstn-call-flows-00.txt   draft-ietf-sipping-pstn-call-flows-01.txt 
SIPPING Working Group A. Johnston SIPPING Working Group A. Johnston
Internet Draft WorldCom Internet Draft WorldCom
Document: draft-ietf-sipping-pstn-call-flows-00.txt S. Donovan Document: draft-ietf-sipping-pstn-call-flows-01.txt S. Donovan
Expires: February 2003 R. Sparks Expires: April 2003 R. Sparks
C. Cunningham C. Cunningham
dynamicsoft dynamicsoft
K. Summers K. Summers
Sonus Sonus
August 2002 November 2002
Session Initiation Protocol PSTN Call Flows Session Initiation Protocol PSTN Call Flows
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
skipping to change at page 1, line 37 skipping to change at line 36
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
Abstract Abstract
This informational document gives examples of Session Initiation This document contains best current practice examples of Session
Protocol (SIP) call flows showing interworking with the Public Initiation Protocol (SIP) call flows showing interworking with the
Switched Telephone Network (PSTN). Elements in these call flows Public Switched Telephone Network (PSTN). Elements in these call
include SIP User Agents and Clients, SIP Proxy Servers, and PSTN flows include SIP User Agents, SIP Proxy Servers, and PSTN Gateways.
Gateways. Scenarios include SIP to PSTN, PSTN to SIP, and PSTN to Scenarios include SIP to PSTN, PSTN to SIP, and PSTN to PSTN via SIP.
PSTN via SIP. PSTN telephony protocols are illustrated using ISDN PSTN telephony protocols are illustrated using ISDN (Integrated
(Integrated Services Digital Network), ANSI ISUP (ISDN User Part), Services Digital Network), ISUP (ISDN User Part), and FGB (Feature
and FGB (Feature Group B) circuit associated signaling. PSTN calls Group B) circuit associated signaling. PSTN calls are illustrated
are illustrated using global telephone numbers from the PSTN and using global telephone numbers from the PSTN and private extensions
private extensions served on by a PBX (Private Branch Exchange). served on by a PBX (Private Branch Exchange). Call flow diagrams and
Call flow diagrams and message details are shown. message details are shown.
SIP PSTN Call Flows August 2002 Johnston et al Expires - May 2003 [Page 1]
SIP PSTN Call Flows November 2002
Conventions used in this document Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [1]. document are to be interpreted as described in RFC-2119 [1].
Table of Contents Table of Contents
1. Overview.......................................................2 1. Overview.......................................................2
1.1 General Assumptions........................................3 1.1 General Assumptions........................................3
1.2 Legend for Message Flows...................................4 1.2 Legend for Message Flows...................................4
1.3 SIP Protocol Assumptions...................................4 1.3 SIP Protocol Assumptions...................................5
2. SIP to PSTN Dialing............................................6 2. SIP to PSTN Dialing............................................6
2.1 Successful SIP to ISUP PSTN call...........................7 2.1 Successful SIP to ISUP PSTN call...........................7
2.2 Successful SIP to ISDN PBX call...........................15 2.2 Successful SIP to ISDN PBX call...........................15
2.3 Successful SIP to ISUP PSTN call with overflow............23 2.3 Successful SIP to ISUP PSTN call with overflow............23
2.4 Unsuccessful SIP to PSTN call: Treatment from PSTN........32 2.4 Unsuccessful SIP to PSTN call: Treatment from PSTN........32
2.5 Unsuccessful SIP to PSTN: REL w/Cause from PSTN...........39 2.5 Unsuccessful SIP to PSTN: REL w/Cause from PSTN...........39
2.6 Unsuccessful SIP to PSTN: ANM Timeout.....................44 2.6 Unsuccessful SIP to PSTN: ANM Timeout.....................44
3. PSTN to SIP Dialing...........................................50 3. PSTN to SIP Dialing...........................................50
3.1 Successful PSTN to SIP call...............................52 3.1 Successful PSTN to SIP call...............................51
3.2 Successful PSTN to SIP call, Fast Answer..................59 3.2 Successful PSTN to SIP call, Fast Answer..................58
3.3 Successful PBX to SIP call................................65 3.3 Successful PBX to SIP call................................64
3.4 Unsuccessful PSTN to SIP REL, SIP error mapped to REL.....72 3.4 Unsuccessful PSTN to SIP REL, SIP error mapped to REL.....71
3.5 Unsuccessful PSTN to SIP REL, SIP busy mapped to REL......74 3.5 Unsuccessful PSTN to SIP REL, SIP busy mapped to REL......73
3.6 Unsuccessful PSTN->SIP, SIP error interworking to tones...78 3.6 Unsuccessful PSTN->SIP, SIP error interworking to tones...77
3.7 Unsuccessful PSTN->SIP, ACM timeout.......................82 3.7 Unsuccessful PSTN->SIP, ACM timeout.......................81
3.8 Unsuccessful PSTN->SIP, ACM timeout, stateless Proxy......86 3.8 Unsuccessful PSTN->SIP, ACM timeout, stateless Proxy......85
3.9 Unsuccessful PSTN->SIP, Caller Abandonment................90 3.9 Unsuccessful PSTN->SIP, Caller Abandonment................89
4. PSTN to PSTN Dialing via SIP Network..........................96 4. PSTN to PSTN Dialing via SIP Network..........................95
4.1 Successful ISUP PSTN to ISUP PSTN call....................97 4.1 Successful ISUP PSTN to ISUP PSTN call....................96
4.2 Successful FGB PBX to ISDN PBX call with overflow........105 4.2 Successful FGB PBX to ISDN PBX call with overflow........104
Security Considerations.........................................113 Security Considerations.........................................112
References......................................................113 Normative References............................................114
Acknowledgments.................................................114 Informative References..........................................114
Acknowledgments.................................................115
Author's Addresses..............................................115 Author's Addresses..............................................115
1. Overview 1. Overview
The call flows shown in this document were developed in the design of The call flows shown in this document were developed in the design of
a carrier-class SIP IP Telephony network. They represent an example a SIP IP communications network. They represent an example
minimum set of functionality for SIP to be used in IP Telephony minimum set of functionality.
applications.
It is the hope of the authors that this document will be useful for It is the hope of the authors that this document will be useful for
SIP implementors, designers, and protocol researchers alike and will SIP implementors, designers, and protocol researchers alike and will
help further the goal of a standard SIP implementation for IP help further the goal of a standard implementation of RFC 3261 [2].
Telephony. It is envisioned that as changes to the standard and These flows represent carefully checked and working group reviewed
additional RFCs are added that this document will reflect those
SIP PSTN Call Flows August 2002
changes and represent the current state of a standard interoperable Johnston et al Expires - May 2002 [Page 2]
SIP IP Telephony implementation. SIP PSTN Call Flows November 2002
These call flows are based on the current version 2.0 of SIP in scenarios of the most common SIP/PSTN interworking examples as a
RFC 3261[2] with SDP usage described in RFC 3264[3]. companion to the specifications.
Note that this document is informational, and is NOT NORMATIVE on any These call flows are based on the current version 2.0 of SIP in
aspect of SIP or SIP/PSTN interworking. RFC 3261 [2] with SDP usage described in RFC 3264 [3]. Other RFCs
also comprise the SIP standard but are not used in this set of basic
call flows. The SIP/ISUP mapping is based on RFC zzzz [4].
Various PSTN signaling protocols are illustrated in this document: Various PSTN signaling protocols are illustrated in this document:
ISDN (Integrated Services Digital Network), ANSI ISUP (ISDN User ISDN (Integrated Services Digital Network), ISUP (ISDN User
Part) and FGB (Feature Group B) circuit associated signaling. They Part) and FGB (Feature Group B) circuit associated signaling. This
were chosen to illustrate the nature of SIP/PSTN interworking - they document shows mainly ANSI ISUP due to its practical origins.
are not a complete or even representative set. Also, some details However, as used in this document, the usage is virtually identical
and parameters of these PSTN protocols have been omitted. For full to the ITU-T International ISUP used as the reference in [4].
information about SIP to ISUP mapping, refer to [4].
Basic SIP call flow examples contained in a companion document, RFC Basic SIP call flow examples are contained in a companion document,
yyyy[5]. RFC yyyy [10].
1.1 General Assumptions 1.1 General Assumptions
A number of architecture, network, and protocol assumptions underly A number of architecture, network, and protocol assumptions underlie
the call flows in this document. Note that these assumptions are not the call flows in this document. Note that these assumptions are not
requirements. They are outlined in this section so that they may be requirements. They are outlined in this section so that they may be
taken into consideration and to aid in the understanding of the call taken into consideration and to aid in the understanding of the call
flow examples. flow examples.
The authentication of SIP User Agents in these example call flows is The authentication of SIP User Agents in these example call flows is
performed using SIP Digest as defined in [3] and [6]. performed using SIP Digest as defined in [3] and [5].
Some Proxy Servers in these call flows insert Record-Route headers Some Proxy Servers in these call flows insert Record-Route headers
into requests to ensure that they are in the signaling path for into requests to ensure that they are in the signaling path for
future message exchanges. future message exchanges.
These flows show UDP for transport. Other transport schemes could These flows show TLS, TCP, and UDP for transport. SCTP [6] could
also be used. also be used. See the discussion in RFC 3261 [2] for details on the
transport issues for SIP.
Throughout this document the call flows show a network where the
proxy servers authenticate users on behalf of gateways. Gateways may
also authenticate users directly. Both of these are reasonable usages
of SIP. If gateways do not authenticate directly they would be to
refuse requests from entities other than trusted proxy servers with
which they have effective channel security (for example [7] or [8])."
The SIP Proxy Server has access to a Location Service and other The SIP Proxy Server has access to a Location Service and other
databases. Information present in the Request-URI and the context databases. Information present in the Request-URI and the context
(From header) is sufficient to determine to which proxy or gateway (From header) is sufficient to determine to which proxy or gateway
the message should be routed. In most cases, a primary and secondary the message should be routed. In most cases, a primary and secondary
SIP PSTN Call Flows August 2002
route will be determined in case of Proxy or Gateway failure route will be determined in case of Proxy or Gateway failure
downstream. downstream.
Gateways provide tones (ringing, busy, etc) and announcements to the Gateways provide tones (ringing, busy, etc) and announcements to the
PSTN side based on SIP response messages, or pass along audio in-band PSTN side based on SIP response messages, or pass along audio in-band
tones (ringing, busy tone, etc.) in an early media stream to the SIP tones (ringing, busy tone, etc.) in an early media stream to the SIP
side. side.
Johnston et al Expires - May 2002 [Page 3]
SIP PSTN Call Flows November 2002
The interactions between the Proxy and Gateway can be summarized as The interactions between the Proxy and Gateway can be summarized as
follows: follows:
. The SIP Proxy Server performs digit analysis and lookup and . The SIP Proxy Server performs digit analysis and lookup and
locates the correct gateway. locates the correct gateway.
. The SIP Proxy Server performs gateway location based on primary . The SIP Proxy Server performs gateway location based on primary
and secondary routing. and secondary routing.
Telephone numbers are usually represented as SIP URIs. Note that an Telephone numbers are usually represented as SIP URIs. Note that an
alternative is the use of the tel URI [9]. alternative is the use of the tel URI [7].
This document shows typical examples of SIP/ISUP interworking.
Although in the spirit of the SIP-T framework [8], these examples do
not represent a complete implementation of the framework. The
examples here represent more of a minimal set of examples for very
basic SIP to ISUP interworking, rather than the more complex goal of
ISUP transparency. In particular, there are NO examples of
encapsulated ISUP in this document. If present, these messages would
show S/MIME encryption due to the sensitive nature of this
information, as discussed in the SIP-T Framework security
considerations section. (Note - RFC 3204 [9] contains an example of
an INVITE with encapsulated ISUP.) See the Security Considerations
section for a more detailed discussion on the security of these call
flows.
In ISUP, the Calling Party Number is abbreviated as CgPN and the
Called Party Number is abbreviated as CdPN. Other abbreviations
include Numbering Plan Indicator (NPI) and Nature of Address (NOA).
1.2 Legend for Message Flows 1.2 Legend for Message Flows
Dashed lines (---) represent signaling messages that are mandatory to Dashed lines (---) represent signaling messages that are mandatory to
the call scenario. These messages can be SIP or PSTN the call scenario. These messages can be SIP or PSTN
signaling. The arrow indicates the direction of message flow. signaling. The arrow indicates the direction of message flow.
Double dashed lines (===) represent media paths between network Double dashed lines (===) represent media paths between network
elements. elements.
Messages with parentheses around their name represent optional Messages with parentheses around their name represent optional
messages. messages.
Messages are identified in the Figures as F1, F2, etc. This Messages are identified in the Figures as F1, F2, etc. This
references the message details in the list that follows the Figure. references the message details in the list that follows the Figure.
Comments in the message details are shown in the following form: Comments in the message details are shown in the following form:
/* Comments. */ /* Comments. */
Johnston et al Expires - May 2002 [Page 4]
SIP PSTN Call Flows November 2002
1.3 SIP Protocol Assumptions 1.3 SIP Protocol Assumptions
This document is informational only and is NOT NORMATIVE in any This document is informational only and is NOT NORMATIVE in any
sense. sense, in that it does not prescribe the flows that are shown, indeed
they MUST NOT be copied due to the reasons described in the next
paragraph. On the other hand, these SIP/PSTN call flows represent
well-reviewed examples of SIP/PSTN interworking usage that are best
common practice according to community consensus.
For simplicity in reading and editing the document, there are a For simplicity in reading and editing the document, there are a
number of differences between some of the examples and actual SIP number of differences between some of the examples and actual SIP
messages. For example, the SIP Digest responses are not actual MD5 messages. For example, the SIP Digest responses are not actual MD5
encodings. Call-IDs are often repeated, and CSeq counts often begin encodings. Call-IDs are often repeated, and CSeq counts often begin
at 1. Header fields are usually shown in the same order. Usually at 1. Header fields are usually shown in the same order. Usually
SIP PSTN Call Flows August 2002
only the minimum required header field set is shown, others that only the minimum required header field set is shown, others that
would normally be present such as Accept, Supported, Allow, etc are would normally be present such as Accept, Supported, Allow, etc are
not shown. not shown.
Actors: Actors:
Element Display Name URI IP Address Element Display Name URI IP Address
------- ------------ --- ---------- ------- ------------ --- ----------
User Agent BigGuy UserA@atlanta.com 192.168.100.101 User Agent Alice sip:alice@atlanta.com 192.0.2.101
User Agent LittleGuy UserB@biloxi.com 192.168.200.201 User Agent Bob sip:bob@biloxi.com 192.0.2.200
Proxy Server ss1.atlanta.com 192.168.255.111 Proxy Server sip:ss1.atlanta.com 192.0.2.111
User Agent (Gateway) gw1.atlanta.com 192.168.255.201 User Agent (Gateway) sip:gw1.atlanta.com 192.0.2.201
User Agent (Gateway) gw2.atlanta.com 192.168.255.202 User Agent (Gateway) sip:gw2.atlanta.com 192.0.2.202
User Agent (Gateway) gw3.atlanta.com 192.168.255.203 User Agent (Gateway) sip:gw3.atlanta.com 192.0.2.203
User Agent (Gateway) ngw1.atlanta.com 192.168.255.101 User Agent (Gateway) sip:ngw1.atlanta.com 192.0.2.103
User Agent (Gateway) ngw2.atlanta.com 192.168.255.102 User Agent (Gateway) sip:ngw2.atlanta.com 192.0.2.102
SIP PSTN Call Flows August 2002
Note that NGW 1 and NGW 2 also have a device URIs (Contacts) of
sip:ngw1@atlanta.com and sip:ngw2@atlanta.com which resolves to the
Proxy Server sip:ss1.wcom.com using DNS SRV records.
Johnston et al Expires - May 2002 [Page 5]
SIP PSTN Call Flows November 2002
2. SIP to PSTN Dialing 2. SIP to PSTN Dialing
In the following scenarios, User A (BigGuy sip:UserA@atlanta.com) is In the following scenarios, Alice (Alice sip:alice@atlanta.com) is a
a SIP phone or other SIP-enabled device. User B is reachable via the SIP phone or other SIP-enabled device. Bob is reachable via the
PSTN at global telephone number +19725552222. User A places a call PSTN at global telephone number +19725552222. Alice places a call
to User B through a Proxy Server Proxy 1 and a Network Gateway. In to Bob through a Proxy Server Proxy 1 and a Network Gateway. In
other scenarios, User A places calls to User C, who is served via a other scenarios, Alice places calls to Carol, who is served via a
PBX (Private Branch Exchange) and is identified by a private PBX (Private Branch Exchange) and is identified by a private
extension 444-3333, or global number +1-918-555-3333. Note that User extension 444-3333, or global number +1-918-555-3333. Note that User
A uses his/her global telephone number +1-314-555-1111 in the From A uses his/her global telephone number +1-314-555-1111 in the From
header in the INVITE messages. This then gives the Gateway the header in the INVITE messages. This then gives the Gateway the
option of using this header to populate the calling party option of using this header to populate the calling party
identification field in subsequent signaling (CgPN in ISUP). Left identification field in subsequent signaling. Left open is the issue
open is the issue of how the Gateway can determine the accuracy of of how the Gateway can determine the accuracy of the telephone
the telephone number, necessary before passing it as a valid CgPN in number, necessary before passing it as a valid calling party number
the PSTN. in the PSTN.
In these scenarios, User A is a SIP phone or other SIP-enabled In these scenarios, Alice is a SIP phone or other SIP-enabled
device. User A places a call to User B in the PSTN or User C on a device. Alice places a call to Bob in the PSTN or Carol on a
PBX through a Proxy Server and a Gateway. PBX through a Proxy Server and a Gateway.
In the failure scenarios, the call does not complete. In some In the failure scenarios, the call does not complete. In some
cases, however, a media stream is still setup. This is due to the cases, however, a media stream is still setup. This is due to the
fact that some failures in dialing to the PSTN result in in-band fact that some failures in dialing to the PSTN result in in-band
tones (busy, reorder tones or announcements - "The number you have tones (busy, reorder tones or announcements - "The number you have
dialed has changed. The new number is..."). The 183 Session dialed has changed. The new number is..."). The 183 Session
Progress response containing SDP media information is used to Progress response containing SDP media information is used to
setup this early media path so that the caller User A knows the final setup this early media path so that the caller Alice knows the final
disposition of the call. disposition of the call.
The media stream is either terminated by the caller after the tone or The media stream is either terminated by the caller after the tone or
announcement has been heard and understood, or by the Gateway after a announcement has been heard and understood, or by the Gateway after a
timer expires. timer expires.
In other failure scenarios, a SS7 Release with Cause Code is mapped In other failure scenarios, a SS7 Release with Cause Code is mapped
to a SIP response. In these scenarios, the early media path is not to a SIP response. In these scenarios, the early media path is not
used, but the actual failure code is conveyed to the caller by the used, but the actual failure code is conveyed to the caller by the
SIP User Agent Client. SIP User Agent Client.
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SIP PSTN Call Flows November 2002
2.1 Successful SIP to ISUP PSTN call 2.1 Successful SIP to ISUP PSTN call
User A Proxy 1 NGW 1 Switch B Alice Proxy 1 NGW 1 Switch B
| | | | | | | |
| INVITE F1 | | | | INVITE F1 | | |
|--------------->| | | |--------------->| | |
| 100 F2 | | | | 100 F2 | | |
|<---------------| INVITE F3 | | |<---------------| INVITE F3 | |
| |--------------->| | | |--------------->| |
| | 100 F4 | | | | 100 F4 | |
| |<---------------| IAM F5 | | |<---------------| IAM F5 |
| | |--------------->| | | |--------------->|
| | | ACM F6 | | | | ACM F6 |
skipping to change at page 7, line 44 skipping to change at line 324
| BYE F14 | | | | BYE F14 | | |
|--------------->| BYE F15 | | |--------------->| BYE F15 | |
| |--------------->| | | |--------------->| |
| | 200 F16 | | | | 200 F16 | |
| 200 F17 |<---------------| REL F18 | | 200 F17 |<---------------| REL F18 |
|<---------------| |--------------->| |<---------------| |--------------->|
| | | RLC F19 | | | | RLC F19 |
| | |<---------------| | | |<---------------|
| | | | | | | |
User A dials the globalized E.164 number +19725552222 to reach Alice dials the globalized E.164 number +19725552222 to reach
User B. Note that A might have only dialed the last 7 digits, or Bob. Note that A might have only dialed the last 7 digits, or
some other dialing plan. It is assumed that the SIP User Agent some other dialing plan. It is assumed that the SIP User Agent
Client converts the digits into a global number and puts them into a Client converts the digits into a global number and puts them into a
SIP URI. Note that tel URIs could be used instead of SIP URIs. SIP URI. Note that tel URIs could be used instead of SIP URIs.
User A could use either their SIP address (sip:UserA@atlanta.com) or Alice could use either their SIP address (sip:alice@atlanta.com) or
SIP telephone number (sip:+13145551111@ss1.atlanta.com;user=phone) in SIP telephone number (sip:+13145551111@ss1.atlanta.com;user=phone) in
the From header. In this example, the telephone number is included, the From header. In this example, the telephone number is included,
and it is shown as being passed as calling party identification and it is shown as being passed as calling party identification
SIP PSTN Call Flows August 2002
through the Network Gateway (NGW 1) to User B (F5). Note that for Johnston et al Expires - May 2002 [Page 7]
this number to be passed into the SS7 network, it would have to be SIP PSTN Call Flows November 2002
somehow verified for accuracy.
In this scenario, User B answers the call then User A disconnects the through the Network Gateway (NGW 1) to Bob (F5). Note that for this
call. Signaling between NGW 1 and User B's telephone switch is ANSI number to be passed into the SS7 network, it would have to be somehow
verified for accuracy.
In this scenario, Bob answers the call then Alice disconnects the
call. Signaling between NGW 1 and Bob's telephone switch is ANSI
ISUP. For the details of SIP to ISUP mapping, refer to [4]. ISUP. For the details of SIP to ISUP mapping, refer to [4].
In this flow, notice that the Contact returned by NGW 1 in messages
F7-11 is sip:ngw1@atlanta.com. This is because NGW 1 only accepts
SIP messages that come through Proxy 1 - any direct signaling will be
ignored. Since this Contact URI may be used outside of this dialog
and must be routable (Section 8.1.1.8 in RFC 3261 [2]) the Contact
URI for NGW 1 must resolve to Proxy 1. This Contact URI is an AOR
which resolves via DNS to Proxy 1 (sip:ss1.atlanta.com) which then
resolves it to sip:ngw1.atlanta.com which is the address of NGW 1.
This flow shows TCP transport.
Message Details Message Details
F1 INVITE A -> Proxy 1 F1 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com;transport=tcp>
Proxy-Authorization: Digest username="UserA", realm="atlanta.com", Proxy-Authorization: Digest username="alice", realm="atlanta.com",
nonce="dc3a5ab25302aa931904ba7d88fa1cf5", opaque="", nonce="dc3a5ab25302aa931904ba7d88fa1cf5", opaque="",
uri="sip:+19725552222@ss1.atlanta.com;user=phone", uri="sip:+19725552222@ss1.atlanta.com;user=phone",
response="ccdca50cb091d587421457305d097458c" response="ccdca50cb091d587421457305d097458c"
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F2 100 Trying Proxy 1 -> User A Johnston et al Expires - May 2002 [Page 8]
SIP PSTN Call Flows November 2002
F2 100 Trying Proxy 1 -> Alice
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
SIP PSTN Call Flows August 2002
Content-Length: 0 Content-Length: 0
/* Proxy 1 uses a Location Service function to determine the gateway /* Proxy 1 uses a Location Service function to determine the gateway
for terminating this call. The call is forwarded to NGW 1. Client for terminating this call. The call is forwarded to NGW 1. Client
for A prepares to receive data on port 49172 from the for A prepares to receive data on port 49172 from the
network.*/ network.*/
F3 INVITE Proxy 1 -> NGW 1 F3 INVITE Proxy 1 -> NGW 1
INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying NGW 1 -> Proxy 1 F4 100 Trying NGW 1 -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> Johnston et al Expires - May 2002 [Page 9]
SIP PSTN Call Flows November 2002
;received=192.0.2.111
From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 IAM NGW 1 -> User B F5 IAM NGW 1 -> Bob
SIP PSTN Call Flows August 2002
IAM IAM
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
F6 ACM User B -> NGW 1 F6 ACM Bob -> NGW 1
ACM ACM
F7 183 Session Progress NGW 1 -> Proxy 1 F7 183 Session Progress NGW 1 -> Proxy 1
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* NGW 1 sends PSTN audio (ringing) in the RTP path to A */ /* NGW 1 sends PSTN audio (ringing) in the RTP path to A */
F8 183 Session Progress Proxy 1 -> User A Johnston et al Expires - May 2002 [Page 10]
SIP PSTN Call Flows November 2002
F8 183 Session Progress Proxy 1 -> Alice
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
SIP PSTN Call Flows August 2002
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F9 ANM User B -> NGW 1 F9 ANM Bob -> NGW 1
ANM ANM
F10 200 OK NGW 1 -> Proxy 1 F10 200 OK NGW 1 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
Johnston et al Expires - May 2002 [Page 11]
SIP PSTN Call Flows November 2002
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F11 200 OK Proxy 1 -> User A F11 200 OK Proxy 1 -> Alice
SIP PSTN Call Flows August 2002
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F12 ACK A -> Proxy 1 F12 ACK Alice -> Proxy 1
ACK sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 ACK sip:ngw1@atlanta.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
Johnston et al Expires - May 2002 [Page 12]
SIP PSTN Call Flows November 2002
F13 ACK Proxy 1 -> NGW 1 F13 ACK Proxy 1 -> NGW 1
ACK sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 ACK sip:ngw1@atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
SIP PSTN Call Flows August 2002
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
/* User A Hangs Up with User B. */ /* Alice Hangs Up with Bob. */
F14 BYE A -> Proxy 1 F14 BYE Alice -> Proxy 1
BYE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 BYE sip:ngw1@atlanta.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F15 BYE Proxy 1 -> NGW 1 F15 BYE Proxy 1 -> NGW 1
BYE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 BYE sip:ngw1@atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
Johnston et al Expires - May 2002 [Page 13]
SIP PSTN Call Flows November 2002
F16 200 OK NGW 1 -> Proxy 1 F16 200 OK NGW 1 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
SIP PSTN Call Flows August 2002
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F17 200 OK Proxy 1 -> A F17 200 OK Proxy 1 -> A
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F18 REL NGW 1 -> B F18 REL NGW 1 -> B
REL REL
CauseCode=16 Normal CauseCode=16 Normal
F19 RLC B -> NGW 1 F19 RLC B -> NGW 1
RLC RLC
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 14]
SIP PSTN Call Flows November 2002
2.2 Successful SIP to ISDN PBX call 2.2 Successful SIP to ISDN PBX call
User A Proxy 1 GW 1 PBX C Alice Proxy 1 GW 1 PBX C
| | | | | | | |
| INVITE F1 | | | | INVITE F1 | | |
|--------------->| | | |--------------->| | |
| 100 F2 | | | | 100 F2 | | |
|<---------------| INVITE F3 | | |<---------------| INVITE F3 | |
| |--------------->| | | |--------------->| |
| | 100 F4 | | | | 100 F4 | |
| |<---------------| SETUP F5 | | |<---------------| SETUP F5 |
| | |--------------->| | | |--------------->|
| | | CALL PROC F6 | | | | CALL PROC F6 |
skipping to change at page 15, line 49 skipping to change at line 717
| |--------------->| | | |--------------->| |
| | 200 F18 | | | | 200 F18 | |
| 200 F19 |<---------------| DISConnect F20 | | 200 F19 |<---------------| DISConnect F20 |
|<---------------| |--------------->| |<---------------| |--------------->|
| | | RELease F21 | | | | RELease F21 |
| | |<---------------| | | |<---------------|
| | | RELease COM F22| | | | RELease COM F22|
| | |--------------->| | | |--------------->|
| | | | | | | |
User A is a SIP device while User C is connected via a Alice is a SIP device while Carol is connected via a
Gateway (GW 1) to a PBX. The PBX connection is via a ISDN trunk Gateway (GW 1) to a PBX. The PBX connection is via a ISDN trunk
group. User A dials User C's telephone number (918-555-3333) which group. Alice dials Carol's telephone number (918-555-3333) which
is globalized and put into a SIP URI. is globalized and put into a SIP URI.
The host portion of the Request-URI in the INVITE F3 is used to The host portion of the Request-URI in the INVITE F3 is used to
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 15]
SIP PSTN Call Flows November 2002
identify the context (customer, trunk group, or line) in which the identify the context (customer, trunk group, or line) in which the
private number 444-3333 is valid. Otherwise, this INVITE message private number 444-3333 is valid. Otherwise, this INVITE message
could get forwarded by GW 1 and the context of the digits could could get forwarded by GW 1 and the context of the digits could
become lost and the call unroutable. become lost and the call unroutable.
Proxy 1 looks up the telephone number and locates the gateway that Proxy 1 looks up the telephone number and locates the gateway that
serves User C. User C is identified by its extension serves Carol. Carolis identified by its extension
(444-3333) in the Request-URI sent to GW 1. (444-3333) in the Request-URI sent to GW 1.
Note that the Contact URI for GW1 as used in messages F8, F9, F12,
and F13 is sips:4443333@gw1.atlanta.com which does resolve directly
to the gateway.
This flow shows the use of Secure SIP (sips) URIs.
Message Details Message Details
F1 INVITE A -> Proxy 1 F1 INVITE Alice -> Proxy 1
INVITE sip:+19185553333@ss1.atlanta.com;user=phone SIP/2.0 INVITE sips:+19185553333@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 INVITE CSeq: 2 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sips:alice@client.atlanta.com>
Proxy-Authorization: Digest username="UserA", Proxy-Authorization: Digest username="alice",
realm="atlanta.com", nonce="qo0dc3a5ab22aa931904badfa1cf5j9h", realm="atlanta.com", nonce="qo0dc3a5ab22aa931904badfa1cf5j9h",
opaque="", uri="sip:+19185553333@ss1.atlanta.com;user=phone", opaque="", uri="sips:+19185553333@ss1.atlanta.com;user=phone",
response="6c792f5c9fa360358b93c7fb826bf550" response="6c792f5c9fa360358b93c7fb826bf550"
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F2 100 Trying Proxy 1 -> User A F2 100 Trying Proxy 1 -> Alice
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 Johnston et al Expires - May 2002 [Page 16]
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> SIP PSTN Call Flows November 2002
Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
SIP PSTN Call Flows August 2002
CSeq: 2 INVITE CSeq: 2 INVITE
Content-Length: 0 Content-Length: 0
F3 INVITE Proxy 1 -> GW 1 F3 INVITE Proxy 1 -> GW 1
INVITE sip:4443333@gw1.atlanta.com SIP/2.0 INVITE sips:4443333@gw1.atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 INVITE CSeq: 2 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sips:alice@client.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying GW -> Proxy 1 F4 100 Trying GW -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 INVITE CSeq: 2 INVITE
Content-Length: 0 Content-Length: 0
F5 SETUP GW 1 -> User C Johnston et al Expires - May 2002 [Page 17]
SIP PSTN Call Flows November 2002
F5 SETUP GW 1 -> Carol
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=SETUP Message type=SETUP
Bearer capability: Information transfer capability=0 (Speech) or 16 Bearer capability: Information transfer capability=0 (Speech) or 16
(3.1 kHz audio) (3.1 kHz audio)
SIP PSTN Call Flows August 2002
Channel identification=Preferred or exclusive B-channel Channel identification=Preferred or exclusive B-channel
Progress indicator=1 (Call is not end-to-end ISDN;further call Progress indicator=1 (Call is not end-to-end ISDN;further call
progress information may be available inband) progress information may be available inband)
Called party number: Called party number:
Type of number unknown Type of number unknown
Digits=444-3333 Digits=444-3333
F6 CALL PROCeeding User C -> GW 1 F6 CALL PROCeeding Carol-> GW 1
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=CALL PROC Message type=CALL PROC
Channel identification=Exclusive B-channel Channel identification=Exclusive B-channel
F7 PROGress User C -> GW 1 F7 PROGress Carol-> GW 1
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=PROG Message type=PROG
Progress indicator=1 (Call is not end-to-end ISDN;further call Progress indicator=1 (Call is not end-to-end ISDN;further call
progress information may be available inband) progress information may be available inband)
F8 180 Ringing GW 1 -> Proxy 1 F8 180 Ringing GW 1 -> Proxy 1
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 INVITE CSeq: 2 INVITE
Contact: <sip:4443333@gw1.atlanta.com> Contact: <sips:4443333@gw1.atlanta.com>
Content-Length: 0 Content-Length: 0
F9 180 Ringing Proxy 1 -> User A F9 180 Ringing Proxy 1 -> Alice
Johnston et al Expires - May 2002 [Page 18]
SIP PSTN Call Flows November 2002
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
SIP PSTN Call Flows August 2002 To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 INVITE CSeq: 2 INVITE
Contact: <sip:4443333@gw1.atlanta.com> Contact: <sips:4443333@gw1.atlanta.com>
Content-Length: 0 Content-Length: 0
F10 CONNect User C -> GW 1 F10 CONNect Carol-> GW 1
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=CONN Message type=CONN
F11 CONNect ACK GW 1 -> User C F11 CONNect ACK GW 1 -> Carol
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=CONN ACK Message type=CONN ACK
F12 200 OK GW 1 -> Proxy 1 F12 200 OK GW 1 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 INVITE CSeq: 2 INVITE
Contact: <sip:4443333@gw1.atlanta.com> Contact: <sips:4443333@gw1.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 140 Content-Length: 140
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
t=0 0 t=0 0
Johnston et al Expires - May 2002 [Page 19]
SIP PSTN Call Flows November 2002
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F13 200 OK Proxy 1 -> User A F13 200 OK Proxy 1 -> Alice
SIP PSTN Call Flows August 2002
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone>;tag=314159 To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 INVITE CSeq: 2 INVITE
Contact: <sip:4443333@gw1.atlanta.com> Contact: <sips:4443333@gw1.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 140 Content-Length: 140
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F14 ACK A -> Proxy 1 F14 ACK Alice -> Proxy 1
ACK sip:4443333@gw1.atlanta.com SIP/2.0 ACK sips:4443333@gw1.atlanta.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sips:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 ACK CSeq: 2 ACK
Content-Length: 0 Content-Length: 0
F15 ACK Proxy 1 -> GW 1 F15 ACK Proxy 1 -> GW 1
ACK sip:4443333@gw1.atlanta.com SIP/2.0 ACK sips:4443333@gw1.atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101
Johnston et al Expires - May 2002 [Page 20]
SIP PSTN Call Flows November 2002
;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
SIP PSTN Call Flows August 2002
CSeq: 2 ACK CSeq: 2 ACK
Content-Length: 0 Content-Length: 0
/* User A Hangs Up with User B. */ /* Alice Hangs Up with Bob. */
F16 BYE A -> Proxy 1 F16 BYE Alice -> Proxy 1
BYE sip:4443333@gw1.atlanta.com SIP/2.0 BYE sips:4443333@gw1.atlanta.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sips:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 3 BYE CSeq: 3 BYE
Content-Length: 0 Content-Length: 0
F17 BYE Proxy 1 -> GW 1 F17 BYE Proxy 1 -> GW 1
BYE sip:4443333@gw1.atlanta.com SIP/2.0 BYE sips:4443333@gw1.atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 3 BYE CSeq: 3 BYE
Content-Length: 0 Content-Length: 0
F18 200 OK GW 1 -> Proxy 1 F18 200 OK GW 1 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 Johnston et al Expires - May 2002 [Page 21]
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> SIP PSTN Call Flows November 2002
Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
SIP PSTN Call Flows August 2002
CSeq: 3 BYE CSeq: 3 BYE
Content-Length: 0 Content-Length: 0
F19 200 OK Proxy 1 -> A F19 200 OK Proxy 1 -> A
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TLS client.atlanta.com:5061;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sips:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: OtherGuy <sip:+19185553333@ss1.atlanta.com;user=phone> To: Carol <sips:+19185553333@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 3 BYE CSeq: 3 BYE
Content-Length: 0 Content-Length: 0
F20 DISConnect GW 1 -> User C F20 DISConnect GW 1 -> Carol
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=DISC Message type=DISC
Cause=16 (Normal clearing) Cause=16 (Normal clearing)
F21 RELease User C -> GW 1 F21 RELease Carol-> GW 1
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=REL Message type=REL
F22 RELease COMplete GW 1 -> User C F22 RELease COMplete GW 1 -> Carol
Protocol discriminator=Q.931 Protocol discriminator=Q.931
Message type=REL COM Message type=REL COM
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 22]
SIP PSTN Call Flows November 2002
2.3 Successful SIP to ISUP PSTN call with overflow 2.3 Successful SIP to ISUP PSTN call with overflow
User A Proxy 1 NGW 1 NGW 2 Switch B Alice Proxy 1 NGW 1 NGW 2 Switch B
| | | | | | | | | |
| INVITE F1 | | | | | INVITE F1 | | | |
|------------->| | | | |------------->| | | |
| | INVITE F2 | | | | | INVITE F2 | | |
| 100 F3 |------------->| | | | 100 F3 |------------->| | |
|<-------------| 503 F4 | | | |<-------------| 503 F4 | | |
| |<-------------| | | | |<-------------| | |
| | ACK F5 | | | | | ACK F5 | | |
| |------------->| | | | |------------->| | |
| | INVITE F6 | | | | INVITE F6 | |
skipping to change at page 23, line 46 skipping to change at line 1106
| BYE F16 | | | | BYE F16 | | |
|------------->| BYE F17 | | |------------->| BYE F17 | |
| |---------------------------->| | | |---------------------------->| |
| | 200 F18 | | | | 200 F18 | |
| 200 F19 |<----------------------------| REL F20 | | 200 F19 |<----------------------------| REL F20 |
|<-------------| |------------->| |<-------------| |------------->|
| | | RLC F21 | | | | RLC F21 |
| | |<-------------| | | |<-------------|
| | | | | | | |
User A calls User B through Proxy 1. Proxy 1 tries to route to a Alice calls Bob through Proxy 1. Proxy 1 tries to route to a
Network Gateway NGW 1. NGW 1 is not available and responds with a 503 Network Gateway NGW 1. NGW 1 is not available and responds with a 503
Service Unavailable (F4). The call is then routed to Network Gateway Service Unavailable (F4). The call is then routed to Network Gateway
NGW 2. User B answers the call. The call is terminated when User A NGW 2. Bob answers the call. The call is terminated when Alice
disconnects the call. NGW 2 and User B's telephone switch use ANSI disconnects the call. NGW 2 and Bob's telephone switch use ANSI
ISUP signaling. ISUP signaling.
NGW 2 also only accepts SIP messages that come through Proxy 1, so
the Contact URI sip:ngw2@atlanta.com is used in this flow.
Johnston et al Expires - May 2002 [Page 23]
SIP PSTN Call Flows November 2002
This flow shows UDP transport.
Message Details Message Details
SIP PSTN Call Flows August 2002
F1 INVITE A -> Proxy 1 F1 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com>
Proxy-Authorization: Digest username="UserA", Proxy-Authorization: Digest username="alice",
realm="atlanta.com", nonce="b59311c3ba05b401cf80b2a2c5ac51b0", realm="atlanta.com", nonce="b59311c3ba05b401cf80b2a2c5ac51b0",
opaque="", uri="sip:+19725552222@ss1.atlanta.com;user=phone", opaque="", uri="sip:+19725552222@ss1.atlanta.com;user=phone",
response="ba6ab44923fa2614b28e3e3957789ab0" response="ba6ab44923fa2614b28e3e3957789ab0"
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine where B is /* Proxy 1 uses a Location Service function to determine where B is
located. Proxy 1 receives a primary route NGW 1 and a secondary located. Proxy 1 receives a primary route NGW 1 and a secondary
route NGW 2. NGW 1 is tried first */ route NGW 2. NGW 1 is tried first */
F2 INVITE Proxy 1 -> NGW 1 F2 INVITE Proxy 1 -> NGW 1
INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Johnston et al Expires - May 2002 [Page 24]
SIP PSTN Call Flows November 2002
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
SIP PSTN Call Flows August 2002
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F3 100 Trying Proxy 1 -> User A F3 100 Trying Proxy 1 -> Alice
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F4 503 Service Unavailable NGW 1 -> Proxy 1 F4 503 Service Unavailable NGW 1 -> Proxy 1
SIP/2.0 503 Service Unavailable SIP/2.0 503 Service Unavailable
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=123456789 ;tag=123456789
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 ACK Proxy 1 -> NGW 1 F5 ACK Proxy 1 -> NGW 1
ACK sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 Johnston et al Expires - May 2002 [Page 25]
SIP PSTN Call Flows November 2002
ACK sip:ngw1@atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com>;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com>;user=phone>
SIP PSTN Call Flows August 2002
;tag=123456789 ;tag=123456789
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
/* Proxy 1 now tries secondary route to NGW 2 */ /* Proxy 1 now tries secondary route to NGW 2 */
F6 INVITE Proxy 1 -> NGW 2 F6 INVITE Proxy 1 -> NGW 2
INVITE sip:+19725552222@ngw2.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ngw2.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F7 IAM NGW 2 -> User B F7 IAM NGW 2 -> Bob
IAM IAM
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
F8 ACM User B -> NGW 2 F8 ACM Bob -> NGW 2
Johnston et al Expires - May 2002 [Page 26]
SIP PSTN Call Flows November 2002
ACM ACM
F9 183 Session Progress NGW 2 -> Proxy 1 F9 183 Session Progress NGW 2 -> Proxy 1
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
SIP PSTN Call Flows August 2002
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw2.atlanta.com;user=phone> Contact: <sip:ngw2@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com
s=- s=-
c=IN IP4 192.168.255.102 c=IN IP4 ngw2.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* RTP packets are sent by GW to A for audio (e.g. ring tone) */ /* RTP packets are sent by GW to A for audio (e.g. ring tone) */
F10 183 Session Progress Proxy 1 -> User A F10 183 Session Progress Proxy 1 -> Alice
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw2.atlanta.com;user=phone> Contact: <sip:ngw2@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
Johnston et al Expires - May 2002 [Page 27]
SIP PSTN Call Flows November 2002
o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com
s=- s=-
c=IN IP4 192.168.255.102 c=IN IP4 ngw2.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
SIP PSTN Call Flows August 2002
F11 ANM User B -> NGW 2 F11 ANM Bob -> NGW 2
ANM ANM
F12 200 OK NGW 2 -> Proxy 1 F12 200 OK NGW 2 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw2.atlanta.com;user=phone> Contact: <sip:ngw2@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com
s=- s=-
c=IN IP4 192.168.255.102 c=IN IP4 ngw2.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F13 200 OK Proxy 1 -> User A F13 200 OK Proxy 1 -> Alice
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Johnston et al Expires - May 2002 [Page 28]
SIP PSTN Call Flows November 2002
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw2.atlanta.com;user=phone> Contact: <sip:ngw2@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
SIP PSTN Call Flows August 2002
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw2.atlanta.com
s=- s=-
c=IN IP4 192.168.255.102 c=IN IP4 ngw2.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F14 ACK A -> Proxy 1 F14 ACK Alice -> Proxy 1
ACK sip:+19725552222@ngw2.atlanta.com;user=phone SIP/2.0 ACK sip:ngw2@atlanta.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
Route: <ss1.atlanta.com;lr> Route: <ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F15 ACK Proxy 1 -> NGW 2 F15 ACK Proxy 1 -> NGW 2
ACK sip:+19725552222@ngw2.atlanta.com;user=phone SIP/2.0 ACK sip:ngw2@atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
/* RTP streams are established between A and B(via the GW) */ /* RTP streams are established between A and B(via the GW) */
/* User A Hangs Up with User B. */ Johnston et al Expires - May 2002 [Page 29]
SIP PSTN Call Flows November 2002
F16 BYE A -> Proxy 1 /* Alice Hangs Up with Bob. */
BYE sip:+19725552222@ngw2.atlanta.com;user=phone SIP/2.0 F16 BYE Alice -> Proxy 1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
SIP PSTN Call Flows August 2002
BYE sip:ngw2@atlanta.com SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
Route: <ss1.atlanta.com;lr> Route: <ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F17 BYE Proxy 1 -> NGW 2 F17 BYE Proxy 1 -> NGW 2
BYE sip:+19725552222@ngw2.atlanta.com;user=phone SIP/2.0 BYE sip:ngw2@atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F18 200 OK NGW 2 -> Proxy 1 F18 200 OK NGW 2 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.2
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F19 200 OK Proxy 1 -> User A Johnston et al Expires - May 2002 [Page 30]
SIP PSTN Call Flows November 2002
F19 200 OK Proxy 1 -> Alice
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
SIP PSTN Call Flows August 2002
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F20 REL NGW 2 -> B F20 REL NGW 2 -> B
REL REL
CauseCode=16 Normal CauseCode=16 Normal
F21 RLC B -> NGW 2 F21 RLC B -> NGW 2
RLC RLC
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 31]
SIP PSTN Call Flows November 2002
2.4 Unsuccessful SIP to PSTN call: Treatment from PSTN 2.4 Unsuccessful SIP to PSTN call: Treatment from PSTN
User A Proxy 1 NGW 1 User B Alice Proxy 1 NGW 1 Bob
| | | | | | | |
| INVITE F1 | | | | INVITE F1 | | |
|--------------->| | | |--------------->| | |
| 100 F2 | | | | 100 F2 | | |
|<---------------| INVITE F3 | | |<---------------| INVITE F3 | |
| |--------------->| | | |--------------->| |
| | 100 F4 | | | | 100 F4 | |
| |<---------------| IAM F5 | | |<---------------| IAM F5 |
| | |--------------->| | | |--------------->|
| | | ACM F6 | | | | ACM F6 |
skipping to change at page 32, line 44 skipping to change at line 1528
| | | RLC F14 | | | | RLC F14 |
| | 487 F15 |<---------------| | | 487 F15 |<---------------|
| |<---------------| | | |<---------------| |
| | ACK F16 | | | | ACK F16 | |
| 487 F17 |--------------->| | | 487 F17 |--------------->| |
|<---------------| | | |<---------------| | |
| ACK F18 | | | | ACK F18 | | |
|--------------->| | | |--------------->| | |
| | | | | | | |
User A calls User B in the PSTN through a proxy server Proxy 1 and a Alice calls Bob in the PSTN through a proxy server Proxy 1 and a
Network Gateway NGW 1. The call is rejected by the PSTN with an in- Network Gateway NGW 1. The call is rejected by the PSTN with an in-
band treatment (tone or recording) played. User A hears the band treatment (tone or recording) played. Alice hears the
treatment and then hangs up, which results in a CANCEL (F9) being treatment and then hangs up, which results in a CANCEL (F9) being
sent to terminate the call. (A BYE is not sent since no final sent to terminate the call. (A BYE is not sent since no final
response was ever received by User A.) response was ever received by Alice.)
Message Details Message Details
SIP PSTN Call Flows August 2002
F1 INVITE A -> Proxy 1 Johnston et al Expires - May 2002 [Page 32]
SIP PSTN Call Flows November 2002
F1 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com;transport=tcp>
Proxy-Authorization: Digest username="UserA", Proxy-Authorization: Digest username="alice",
realm="atlanta.com", nonce="01cf8311c3b0b2a2c5ac51bb59a05b40", realm="atlanta.com", nonce="01cf8311c3b0b2a2c5ac51bb59a05b40",
opaque="", uri="sip:+19725552222@ss1.atlanta.com;user=phone", opaque="", uri="sip:+19725552222@ss1.atlanta.com;user=phone",
response="e178fbe430e6680a1690261af8831f40" response="e178fbe430e6680a1690261af8831f40"
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F2 100 Trying Proxy 1 -> A F2 100 Trying Proxy 1 -> A
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
/* Proxy 1 uses a Location Service function to determine where B is /* Proxy 1 uses a Location Service function to determine where B is
located. Based upon location analysis the call is forwarded to NGW located. Based upon location analysis the call is forwarded to NGW
1. Client for A prepares to receive data on port 49172 from the 1. Client for A prepares to receive data on port 49172 from the
network. */ network. */
F3 INVITE Proxy 1 -> NGW 1 F3 INVITE Proxy 1 -> NGW 1
INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 33]
SIP PSTN Call Flows November 2002
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying NGW 1 -> Proxy 1 F4 100 Trying NGW 1 -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 IAM NGW 1 -> User B F5 IAM NGW 1 -> Bob
IAM IAM
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
F6 ACM User B -> NGW 1 F6 ACM Bob -> NGW 1
ACM ACM
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 34]
SIP PSTN Call Flows November 2002
F7 183 Session Progress NGW 1 -> Proxy 1 F7 183 Session Progress NGW 1 -> Proxy 1
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F8 183 Session Progress Proxy 1 -> User A F8 183 Session Progress Proxy 1 -> Alice
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 35]
SIP PSTN Call Flows November 2002
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Caller hears the recorded announcement, then hangs up */ /* Caller hears the recorded announcement, then hangs up */
F9 CANCEL A -> Proxy 1 F9 CANCEL Alice -> Proxy 1
CANCEL sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 CANCEL sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F10 200 OK Proxy 1 -> A F10 200 OK Proxy 1 -> A
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F11 CANCEL Proxy 1 -> NGW 1 F11 CANCEL Proxy 1 -> NGW 1
CANCEL sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 CANCEL sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F12 200 OK NGW 1 -> Proxy 1 F12 200 OK NGW 1 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
SIP PSTN Call Flows August 2002
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> Johnston et al Expires - May 2002 [Page 36]
SIP PSTN Call Flows November 2002
From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F13 REL NGW 1 -> B F13 REL NGW 1 -> B
REL REL
CauseCode=18 No user responding CauseCode=18 No user responding
F14 RLC B -> NGW 1 F14 RLC B -> NGW 1
RLC RLC
F15 487 Request Terminated NGW 1 -> Proxy 1 F15 487 Request Terminated NGW 1 -> Proxy 1
SIP/2.0 487 Request Terminated SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F16 ACK Proxy 1 -> NGW 1 F16 ACK Proxy 1 -> NGW 1
ACK sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 ACK sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 37]
SIP PSTN Call Flows November 2002
F17 487 Request Terminated Proxy 1 -> A F17 487 Request Terminated Proxy 1 -> A
SIP/2.0 487 Request Terminated SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F18 ACK A -> Proxy 1 F18 ACK Alice -> Proxy 1
ACK sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 ACK sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 38]
SIP PSTN Call Flows November 2002
2.5 Unsuccessful SIP to PSTN: REL w/Cause from PSTN 2.5 Unsuccessful SIP to PSTN: REL w/Cause from PSTN
User A Proxy 1 NGW 1 Switch B Alice Proxy 1 NGW 1 Switch B
| | | | | | | |
| INVITE F1 | | | | INVITE F1 | | |
|--------------->| | | |--------------->| | |
| 100 F2 | | | | 100 F2 | | |
|<---------------| INVITE F3 | | |<---------------| INVITE F3 | |
| |--------------->| | | |--------------->| |
| | 100 F4 | | | | 100 F4 | |
| |<---------------| IAM F5 | | |<---------------| IAM F5 |
| | |--------------->| | | |--------------->|
| | | REL(1) F6 | | | | REL(1) F6 |
skipping to change at page 39, line 31 skipping to change at line 1841
| | 404 F8 |--------------->| | | 404 F8 |--------------->|
| |<---------------| | | |<---------------| |
| | ACK F9 | | | | ACK F9 | |
| |--------------->| | | |--------------->| |
| 404 F10 | | | | 404 F10 | | |
|<---------------| | | |<---------------| | |
| ACK F11 | | | | ACK F11 | | |
|--------------->| | | |--------------->| | |
| | | | | | | |
User A calls PSTN User B through a Proxy Server Proxy 1 and a Network Alice calls PSTN Bob through a Proxy Server Proxy 1 and a Network
Gateway NGW 1. The call is rejected by the PSTN with a Gateway NGW 1. The call is rejected by the PSTN with a
ANSI ISUP Release message REL containing a specific Cause code. ANSI ISUP Release message REL containing a specific Cause code.
This cause value (1) is mapped by the Gateway to a SIP 404 Address This cause value (1) is mapped by the Gateway to a SIP 404 Address
Incomplete response which is proxied back to User A. For more Incomplete response which is proxied back to Alice. For more
details of ISUP cause value to SIP responses refer to [4]. details of ISUP cause value to SIP response mapping refer to [4].
Message Details Message Details
F1 INVITE A -> Proxy 1 F1 INVITE Alice -> Proxy 1
INVITE sip:+44-1234@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+44-1234@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone> To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com;transport=tcp>
Proxy-Authorization: Digest username="UserA", Proxy-Authorization: Digest username="alice",
realm="atlanta.com", nonce="j1c3b0b01cf832da2c5ac51bb59a05b40", realm="atlanta.com", nonce="j1c3b0b01cf832da2c5ac51bb59a05b40",
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 39]
SIP PSTN Call Flows November 2002
opaque="", uri="sip:+44-1234@ss1.atlanta.com;user=phone", opaque="", uri="sip:+44-1234@ss1.atlanta.com;user=phone",
response="a451358d46b55512863efe1dccaa2f42" response="a451358d46b55512863efe1dccaa2f42"
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F2 100 Trying Proxy 1 -> A F2 100 Trying Proxy 1 -> A
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone> To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
/* Proxy 1 uses a Location Service function to determine where B is /* Proxy 1 uses a Location Service function to determine where B is
located. Based upon location analysis the call is forwarded to NGW1. located. Based upon location analysis the call is forwarded to NGW1.
Client for A prepares to receive data on port 49172 from the network. Client for A prepares to receive data on port 49172 from the network.
*/ */
F3 INVITE Proxy 1 -> NGW 1 F3 INVITE Proxy 1 -> NGW 1
INVITE sip:+44-1234@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+44-1234@ngw1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone> To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 40]
SIP PSTN Call Flows November 2002
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying NGW 1 -> Proxy 1 F4 100 Trying NGW 1 -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone> To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 IAM NGW 1 -> User B F5 IAM NGW 1 -> Bob
IAM IAM
CdPN=44-1234,NPI=E.164,NOA=International CdPN=44-1234,NPI=E.164,NOA=International
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
F6 REL User B -> NGW 1 F6 REL Bob -> NGW 1
REL REL
CauseValue=1 Unallocated number CauseValue=1 Unallocated number
F7 RLC NGW 1 -> User B F7 RLC NGW 1 -> Bob
RLC RLC
/* Network Gateway maps CauseValue=1 to the SIP message 404 Not /* Network Gateway maps CauseValue=1 to the SIP message 404 Not
Found */ Found */
F8 404 Not Found NGW 1 -> Proxy 1 F8 404 Not Found NGW 1 -> Proxy 1
SIP/2.0 404 Not Found SIP/2.0 404 Not Found
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
SIP PSTN Call Flows August 2002
;received=192.168.255.111 Johnston et al Expires - May 2002 [Page 41]
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 SIP PSTN Call Flows November 2002
;received=192.168.100.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> ;received=192.0.2.111
Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.0.2.101
From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159 To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Error-Info: <sip:not-found-ann@ann.atlanta.com> Error-Info: <sip:not-found-ann@ann.atlanta.com>
Content-Length: 0 Content-Length: 0
F9 ACK Proxy 1 -> NGW 1 F9 ACK Proxy 1 -> NGW 1
ACK sip:+44-1234@ngw1.atlanta.com;user=phone SIP/2.0 ACK sip:+44-1234@ngw1.atlanta.com;user=phone SIP/2.0
Max-Forwards: 70 Max-Forwards: 70
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159 To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F10 404 Not Found Proxy 1 -> User A F10 404 Not Found Proxy 1 -> Alice
SIP/2.0 404 Not Found SIP/2.0 404 Not Found
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159 To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Error-Info: <sip:not-found-ann@ann.atlanta.com> Error-Info: <sip:not-found-ann@ann.atlanta.com>
Content-Length: 0 Content-Length: 0
F11 ACK User A -> Proxy 1 F11 ACK Alice -> Proxy 1
ACK sip:+44-1234@ss1.atlanta.com;user=phone SIP/2.0 ACK sip:+44-1234@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159 To: Bob <sip:+44-1234@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 42]
SIP PSTN Call Flows November 2002
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 43]
SIP PSTN Call Flows November 2002
2.6 Unsuccessful SIP to PSTN: ANM Timeout 2.6 Unsuccessful SIP to PSTN: ANM Timeout
User A Proxy 1 NGW 1 Switch B Alice Proxy 1 NGW 1 Switch B
| | | | | | | |
| INVITE F1 | | | | INVITE F1 | | |
|--------------->| | | |--------------->| | |
| 100 F2 | | | | 100 F2 | | |
|<---------------| INVITE F3 | | |<---------------| INVITE F3 | |
| |--------------->| | | |--------------->| |
| | 100 F4 | | | | 100 F4 | |
| |<---------------| IAM F5 | | |<---------------| IAM F5 |
| | |--------------->| | | |--------------->|
| | | ACM F6 | | | | ACM F6 |
skipping to change at page 44, line 36 skipping to change at line 2050
| | | RLC F10 | | | | RLC F10 |
| | 480 F11 |<---------------| | | 480 F11 |<---------------|
| |<---------------| | | |<---------------| |
| | ACK F12 | | | | ACK F12 | |
| |--------------->| | | |--------------->| |
| 480 F13 | | | | 480 F13 | | |
|<---------------| | | |<---------------| | |
| ACK F14 | | | | ACK F14 | | |
|--------------->| | | |--------------->| | |
User A calls User B in the PSTN through a proxy server Proxy 1 and Alice calls Bob in the PSTN through a proxy server Proxy 1 and
Network Gateway NGW 1. The call is released by the Gateway after a Network Gateway NGW 1. The call is released by the Gateway after a
timer expires due to no ANswer Message (ANM) being received. The timer expires due to no ANswer Message (ANM) being received. The
Gateway sends an ISUP Release REL message to the PSTN and a 480 Gateway sends an ISUP Release REL message to the PSTN and a 480
Temporarily Unavailable response to User A in the SIP network. Temporarily Unavailable response to Alice in the SIP network.
Message Details Message Details
F1 INVITE A -> Proxy 1 F1 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 44]
SIP PSTN Call Flows November 2002
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserA@192.168.100.101> Contact: <sip:alice@client.atlanta.com;transport=tcp>
Proxy-Authorization: Digest username="UserA", Proxy-Authorization: Digest username="alice",
realm="atlanta.com", nonce="da2c5ac51bb59a05j1c3b0b01cf832b40", realm="atlanta.com", nonce="da2c5ac51bb59a05j1c3b0b01cf832b40",
opaque="", uri="sip:+19725552222@ss1.atlanta.com;user=phone", opaque="", uri="sip:+19725552222@ss1.atlanta.com;user=phone",
response="579cb9db184cdc25bf816f37cbc03c7d" response="579cb9db184cdc25bf816f37cbc03c7d"
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine where B is /* Proxy 1 uses a Location Service function to determine where B is
located. Based upon location analysis the call is forwarded to NGW located. Based upon location analysis the call is forwarded to NGW
1. Client for A prepares to receive data on port 49172 from the 1. Client for A prepares to receive data on port 49172 from the
network.*/ network.*/
F2 100 Trying Proxy 1 -> A F2 100 Trying Proxy 1 -> A
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F3 INVITE Proxy 1 -> NGW 1 F3 INVITE Proxy 1 -> NGW 1
INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
SIP PSTN Call Flows August 2002
Contact: <sip:UserA@192.168.100.101> Johnston et al Expires - May 2002 [Page 45]
SIP PSTN Call Flows November 2002
Contact: <sip:alice@client.atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 147 Content-Length: 150
v=0 v=0
o=UserA 2890844526 2890844526 IN IP4 client.atlanta.com o=alice 2890844526 2890844526 IN IP4 client.atlanta.com
s=- s=-
c=IN IP4 192.168.100.101 c=IN IP4 client.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 49172 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying NGW 1 -> Proxy 1 F4 100 Trying NGW 1 -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 IAM NGW 1 -> User B F5 IAM NGW 1 -> Bob
IAM IAM
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
F6 ACM User B -> NGW 1 F6 ACM Bob -> NGW 1
ACM ACM
F7 183 Session Progress NGW 1 -> Proxy 1 F7 183 Session Progress NGW 1 -> Proxy 1
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 46]
SIP PSTN Call Flows November 2002
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F8 183 Session Progress Proxy 1 -> User A F8 183 Session Progress Proxy 1 -> Alice
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+19725552222@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* After NGW 1's timer expires, Network Gateway sends REL to ISUP /* After NGW 1's timer expires, Network Gateway sends REL to ISUP
network and 480 to SIP network */ network and 480 to SIP network */
F9 REL NGW 1 -> User B F9 REL NGW 1 -> Bob
REL REL
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 47]
SIP PSTN Call Flows November 2002
CauseCode=18 No user responding CauseCode=18 No user responding
F10 RLC User B -> NGW 1 F10 RLC Bob -> NGW 1
RLC RLC
F11 480 Temporarily Unavailable NGW 1 -> Proxy 1 F11 480 Temporarily Unavailable NGW 1 -> Proxy 1
SIP/2.0 480 Temporarily Unavailable SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Error-Info: <sip:temp-unavail-ann@ann.atlanta.com> Error-Info: <sip:temp-unavail-ann@ann.atlanta.com>
Content-Length: 0 Content-Length: 0
F12 ACK Proxy 1 -> NGW 1 F12 ACK Proxy 1 -> NGW 1
ACK sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 ACK sip:ngw1@atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70 Max-Forwards: 70
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F13 480 Temporarily Unavailable F13 Proxy 1 -> User A F13 480 Temporarily Unavailable F13 Proxy 1 -> Alice
SIP/2.0 480 Temporarily Unavailable SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
;received=192.168.100.101 ;received=192.0.2.101
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 48]
SIP PSTN Call Flows November 2002
CSeq: 1 INVITE CSeq: 1 INVITE
Error-Info: <sip:temp-unavail-ann@ann.atlanta.com> Error-Info: <sip:temp-unavail-ann@ann.atlanta.com>
Content-Length: 0 Content-Length: 0
F14 ACK User A -> Proxy 1 F14 ACK Alice -> Proxy 1
ACK sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 ACK sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Max-Forwards: 70 Max-Forwards: 70
Via: SIP/2.0/UDP client.atlanta.com:5060;branch=z9hG4bK74bf9 Via: SIP/2.0/TCP client.atlanta.com:5060;branch=z9hG4bK74bf9
From: BigGuy <sip:+13145551111@ss1.atlanta.com;user=phone> From: Alice <sip:+13145551111@ss1.atlanta.com;user=phone>
;tag=9fxced76sl ;tag=9fxced76sl
To: LittleGuy <sip:+19725552222@ss1.atlanta.com;user=phone> To: Bob <sip:+19725552222@ss1.atlanta.com;user=phone>
;tag=314159 ;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@atlanta.com Call-ID: 2xTb9vxSit55XU7p8@atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 49]
SIP PSTN Call Flows November 2002
3. PSTN to SIP Dialing 3. PSTN to SIP Dialing
In these scenarios, User A is placing calls from the PSTN to User B In these scenarios, Alice is placing calls from the PSTN to Bob
in a SIP network. User A's telephone switch signals to a Network in a SIP network. Alice's telephone switch signals to a Network
Gateway (NGW 1) using ANSI ISUP. Gateway (NGW 1) using ANSI ISUP.
Since the called SIP User Agent does not send in-band signaling Since the called SIP User Agent does not send in-band signaling
information, no early media path needs to be established on the IP information, no early media path needs to be established on the IP
side. As a result, the 183 Session Progress response is not used. side. As a result, the 183 Session Progress response is not used.
However, NGW 1 will establish a one way speech path prior to call However, NGW 1 will establish a one way speech path prior to call
completion, and generate ringing for the PSTN caller. Any tones or completion, and generate ringing for the PSTN caller. Any tones or
recordings are generated by NGW 1 and played in this speech path. recordings are generated by NGW 1 and played in this speech path.
When the call completes successfully, NGW 1 bridges the PSTN speech When the call completes successfully, NGW 1 bridges the PSTN speech
path with the IP media path. path with the IP media path.
To reduce the number of messages, only a single proxy server is shown To reduce the number of messages, only a single proxy server is shown
in these flows, which means that the atlanta.com proxy server has in these flows, which means that the atlanta.com proxy server has
access to the biloxi.com location service. access to the biloxi.com location service.
SIP PSTN Call Flows August 2002 Johnston et al Expires - May 2002 [Page 50]
SIP PSTN Call Flows August 2002 SIP PSTN Call Flows November 2002
3.1 Successful PSTN to SIP call 3.1 Successful PSTN to SIP call
Switch A NGW 1 Proxy 1 User B Switch A NGW 1 Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | 100 F4 |--------------->| | | 100 F4 |--------------->|
| |<---------------| | | |<---------------| |
| | | 180 F5 | | | | 180 F5 |
| | 180 F6 |<---------------| | | 180 F6 |<---------------|
| ACM F7 |<---------------| | | ACM F7 |<---------------| |
|<---------------| | | |<---------------| | |
skipping to change at page 52, line 40 skipping to change at line 2347
|--------------->| | | |--------------->| | |
| RLC F14 | | | | RLC F14 | | |
|<---------------| BYE F15 | | |<---------------| BYE F15 | |
| |--------------->| BYE F16 | | |--------------->| BYE F16 |
| | |--------------->| | | |--------------->|
| | | 200 F17 | | | | 200 F17 |
| | 200 F18 |<---------------| | | 200 F18 |<---------------|
| |<---------------| | | |<---------------| |
| | | | | | | |
In this scenario, User A from the PSTN calls User B through a Network In this scenario, Alice from the PSTN calls Bob through a Network
Gateway NGW1 and Proxy Server Proxy 1. When User B answers the call Gateway NGW1 and Proxy Server Proxy 1. When Bob answers the call
the media path is setup end-to-end. The call terminates when User A the media path is setup end-to-end. The call terminates when Alice
hangs up the call, with User A's telephone switch sending an ISUP hangs up the call, with Alice's telephone switch sending an ISUP
RELease message which is mapped to a BYE by NGW 1. RELease message which is mapped to a BYE by NGW 1.
Message Details Message Details
F1 IAM User A -> NGW 1 F1 IAM Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
SIP PSTN Call Flows August 2002
F2 INVITE A -> Proxy 1 Johnston et al Expires - May 2002 [Page 51]
SIP PSTN Call Flows November 2002
F2 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine where B is /* Proxy 1 uses a Location Service function to determine where B is
located. Based upon location analysis the call is forwarded to NGW located. Based upon location analysis the call is forwarded to NGW
1. NGW 1 prepares to receive data on port 3456 from User A.*/ 1. NGW 1 prepares to receive data on port 3456 from Alice.*/
F3 INVITE Proxy 1 -> User B F3 INVITE Proxy 1 -> Bob
INVITE sip:UserB@192.168.200.201 SIP/2.0 INVITE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 52]
SIP PSTN Call Flows November 2002
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying User B -> Proxy 1 F4 100 Trying Bob -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 180 Ringing User B -> Proxy 1 F5 180 Ringing Bob -> Proxy 1
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
Content-Length: 0 Content-Length: 0
F6 180 Ringing Proxy 1 -> NGW 1 F6 180 Ringing Proxy 1 -> NGW 1
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
Content-Length: 0 Content-Length: 0
F7 ACM NGW 1 -> User A F7 ACM NGW 1 -> Alice
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 53]
SIP PSTN Call Flows November 2002
ACM ACM
F8 200 OK User B -> Proxy 1 F8 200 OK Bob -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 145 Content-Length: 146
v=0 v=0
o=UserB 2890844527 2890844527 IN IP4 client.biloxi.com o=bob 2890844527 2890844527 IN IP4 client.biloxi.com
s=- s=-
c=IN IP4 192.168.200.201 c=IN IP4 client.biloxi.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F9 200 OK Proxy 1 -> NGW 1 F9 200 OK Proxy 1 -> NGW 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 145 Content-Length: 146
v=0 v=0
o=UserB 2890844527 2890844527 IN IP4 client.biloxi.com o=bob 2890844527 2890844527 IN IP4 client.biloxi.com
s=- s=-
c=IN IP4 192.168.200.201 c=IN IP4 client.biloxi.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 54]
SIP PSTN Call Flows November 2002
F10 ACK NGW 1 -> Proxy 1 F10 ACK NGW 1 -> Proxy 1
ACK sip:UserB@192.168.200.201 SIP/2.0 ACK sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F11 ACK Proxy 1 -> User B F11 ACK Proxy 1 -> Bob
ACK sip:UserB@192.168.200.201 SIP/2.0 ACK sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F12 ANM User B -> NGW 1 F12 ANM Bob -> NGW 1
ANM ANM
/* RTP streams are established between A and B (via the GW) */ /* RTP streams are established between A and B (via the GW) */
/* User A Hangs Up with User B. */ /* Alice Hangs Up with Bob. */
F13 REL User A -> NGW 1 F13 REL Alice -> NGW 1
REL REL
CauseCode=16 Normal CauseCode=16 Normal
F14 RLC NGW 1 -> User A F14 RLC NGW 1 -> Alice
RLC RLC
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 55]
SIP PSTN Call Flows November 2002
F15 BYE NGW 1-> Proxy 1 F15 BYE NGW 1-> Proxy 1
BYE sip:UserB@192.168.200.201 SIP/2.0 BYE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F16 BYE Proxy 1 -> User B F16 BYE Proxy 1 -> Bob
BYE sip:UserB@192.168.200.201 SIP/2.0 BYE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F17 200 OK User B -> Proxy 1 F17 200 OK Bob -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F18 200 OK Proxy 1 -> NGW 1 F18 200 OK Proxy 1 -> NGW 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 56]
SIP PSTN Call Flows November 2002
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 57]
SIP PSTN Call Flows November 2002
3.2 Successful PSTN to SIP call, Fast Answer 3.2 Successful PSTN to SIP call, Fast Answer
Switch A NGW 1 Proxy 1 User B Switch A NGW 1 Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | 100 F4 |--------------->| | | 100 F4 |--------------->|
| |<---------------| | | |<---------------| |
| | | 200 F5 | | | | 200 F5 |
| | 200 F6 |<---------------| | | 200 F6 |<---------------|
| |<---------------| | | |<---------------| |
| | ACK F7 | | | | ACK F7 | |
skipping to change at page 59, line 34 skipping to change at line 2643
|--------------->| | | |--------------->| | |
| RLC F11 | | | | RLC F11 | | |
|<---------------| BYE F12 | | |<---------------| BYE F12 | |
| |--------------->| BYE F13 | | |--------------->| BYE F13 |
| | |--------------->| | | |--------------->|
| | | 200 F14 | | | | 200 F14 |
| | 200 F15 |<---------------| | | 200 F15 |<---------------|
| |<---------------| | | |<---------------| |
| | | | | | | |
This "fast answer" scenario is similar to 5.1.1 except that User B This "fast answer" scenario is similar to 3.1 except that Bob
immediately accepts the call, sending a 200 OK (F5) without sending a immediately accepts the call, sending a 200 OK (F5) without sending a
180 Ringing response. The Gateway then sends an Answer Message (ANM) 180 Ringing response. The Gateway then sends an Answer Message (ANM)
without sending an Address Complete Message (ACM). Note that for without sending an Address Complete Message (ACM). Note that for
ETSI and some other ISUP variants, a CONnect message (CON) would be ETSI and some other ISUP variants, a CONnect message (CON) would be
sent instead of the ANM. sent instead of the ANM.
Message Details Message Details
F1 IAM User A -> NGW 1 F1 IAM Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
F2 INVITE NGW 1 -> Proxy 1 F2 INVITE NGW 1 -> Proxy 1
INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 58]
SIP PSTN Call Flows November 2002
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine where B is /* Proxy 1 uses a Location Service function to determine where B is
located. Based upon location analysis the call is forwarded to User located. Based upon location analysis the call is forwarded to User
B. User B prepares to receive data on port 3456 from User A.*/ B. Bob prepares to receive data on port 3456 from Alice.*/
F3 INVITE Proxy 1 -> User B F3 INVITE Proxy 1 -> Bob
INVITE UserB@biloxi.com SIP/2.0 INVITE bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying Proxy 1 -> NGW 1 F4 100 Trying Proxy 1 -> NGW 1
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 59]
SIP PSTN Call Flows November 2002
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 200 OK User B -> Proxy 1 F5 200 OK Bob -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 145 Content-Length: 146
v=0 v=0
o=UserB 2890844527 2890844527 IN IP4 client.biloxi.com o=bob 2890844527 2890844527 IN IP4 client.biloxi.com
s=- s=-
c=IN IP4 192.168.200.201 c=IN IP4 client.biloxi.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F6 200 OK Proxy 1 -> NGW 1 F6 200 OK Proxy 1 -> NGW 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 145 Content-Length: 147
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 60]
SIP PSTN Call Flows November 2002
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.200.201 c=IN IP4 client.biloxi.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F7 ACK NGW 1 -> Proxy 1 F7 ACK NGW 1 -> Proxy 1
ACK UserB@192.168.200.201 SIP/2.0 ACK bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F8 ACK Proxy 1 -> User B F8 ACK Proxy 1 -> Bob
ACK UserB@192.168.200.201 SIP/2.0 ACK bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=130.131.132.14 ;received=130.131.132.14
Max-Forwards: 69 Max-Forwards: 69
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F9 ANM User B -> NGW 1 F9 ANM Bob -> NGW 1
ANM ANM
/* RTP streams are established between A and B (via the GW) */ /* RTP streams are established between A and B (via the GW) */
/* User A Hangs Up with User B. */ /* Alice Hangs Up with Bob. */
F10 REL ser A -> NGW 1 F10 REL ser Alice -> NGW 1
REL REL
CauseCode=16 Normal CauseCode=16 Normal
SIP PSTN Call Flows August 2002
F11 RLC NGW 1 -> User A Johnston et al Expires - May 2002 [Page 61]
SIP PSTN Call Flows November 2002
F11 RLC NGW 1 -> Alice
RLC RLC
F12 BYE NGW 1 -> Proxy 1 F12 BYE NGW 1 -> Proxy 1
BYE sip:UserB@192.168.200.201 SIP/2.0 BYE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F13 BYE Proxy 1 -> User B F13 BYE Proxy 1 -> Bob
BYE sip:UserB@192.168.200.201 SIP/2.0 BYE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F14 200 OK User B -> Proxy 1 F14 200 OK Bob -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F15 200 OK Proxy 1 -> NGW 1 F15 200 OK Proxy 1 -> NGW 1
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 62]
SIP PSTN Call Flows November 2002
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 63]
SIP PSTN Call Flows November 2002
3.3 Successful PBX to SIP call 3.3 Successful PBX to SIP call
PBX A GW 1 Proxy 1 User B PBX A GW 1 Proxy 1 Bob
| | | | | | | |
| Seizure | | | | Seizure | | |
|--------------->| | | |--------------->| | |
| Wink | | | | Wink | | |
|<---------------| | | |<---------------| | |
| MF Digits F1 | | | | MF Digits F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | 100 F4 |--------------->| | | 100 F4 |--------------->|
| |<---------------| | | |<---------------| |
skipping to change at page 65, line 43 skipping to change at line 2911
|--------------->| | | |--------------->| | |
| Seizure Removal| | | | Seizure Removal| | |
|<---------------| BYE F11 | | |<---------------| BYE F11 | |
| |--------------->| BYE F12 | | |--------------->| BYE F12 |
| | |--------------->| | | |--------------->|
| | | 200 F13 | | | | 200 F13 |
| | 200 F14 |<---------------| | | 200 F14 |<---------------|
| |<---------------| | | |<---------------| |
| | | | | | | |
In this scenario, User A dials from PBX A to User B through GW 1 and In this scenario, Alice dials from PBX A to Bob through GW 1 and
Proxy 1. This is an example of a call that appears destined for the Proxy 1. This is an example of a call that appears destined for the
PSTN but instead is routed to a SIP Client. PSTN but instead is routed to a SIP Client.
Signaling between PBX A and GW 1 is Feature Group B (FGB) circuit Signaling between PBX A and GW 1 is Feature Group B (FGB) circuit
associated signaling, in-band Mult-Frequency (MF) outpulsing. After associated signaling, in-band Mult-Frequency (MF) outpulsing. After
the receipt of the 180 Ringing from User B, GW 1 generates ringing the receipt of the 180 Ringing from Bob, GW 1 generates ringing
tone for User A. tone for Alice.
User B answers the call by sending a 200 OK. The call terminates Bob answers the call by sending a 200 OK. The call terminates
when User A hangs up, causing GW1 to send a BYE. when Alice hangs up, causing GW1 to send a BYE.
SIP PSTN Call Flows August 2002 Johnston et al Expires - May 2002 [Page 64]
SIP PSTN Call Flows November 2002
The Gateway can only identify the trunk group that the The Gateway can only identify the trunk group that the
call came in on, it cannot identify the individual line on PBX A that call came in on, it cannot identify the individual line on PBX A that
is placing the call. The SIP URI used to identify the caller is is placing the call. The SIP URI used to identify the caller is
shown in these flows as sip:551313@gw1.atlanta.com. shown in these flows as sip:551313@gw1.atlanta.com.
Message Details Message Details
PBX A -> GW 1 PBX Alice -> GW 1
Seizure Seizure
GW 1 -> PBX A GW 1 -> PBX A
Wink Wink
F1 MF Digits PBX A -> GW 1 F1 MF Digits PBX Alice -> GW 1
KP 1 972 555 2222 ST KP 1 972 555 2222 ST
F2 INVITE GW 1 -> Proxy 1 F2 INVITE GW 1 -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
Max-Forwards: 70 Max-Forwards: 70
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:551313@gw1.atlanta.com;user=phone> Contact: <sip:551313@gw1.atlanta.com;user=phone>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine where the /* Proxy 1 uses a Location Service function to determine where the
phone number +19725552222 is located. Based upon location phone number +19725552222 is located. Based upon location
analysis the call is forwarded to SIP User B. */ analysis the call is forwarded to SIP Bob. */
SIP PSTN Call Flows August 2002
F3 INVITE Proxy 1 -> User B Johnston et al Expires - May 2002 [Page 65]
SIP PSTN Call Flows November 2002
INVITE sip:UserB@192.168.200.201 SIP/2.0 F3 INVITE Proxy 1 -> Bob
INVITE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:551313@gw1.atlanta.com;user=phone> Contact: <sip:551313@gw1.atlanta.com;user=phone>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying Proxy 1 -> GW 1 F4 100 Trying Proxy 1 -> GW 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 180 Ringing User B -> Proxy 1 F5 180 Ringing Bob -> Proxy 1
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
SIP PSTN Call Flows August 2002
Contact: <sip:UserB@192.168.200.201> Johnston et al Expires - May 2002 [Page 66]
SIP PSTN Call Flows November 2002
Contact: <sip:bob@client.biloxi.com>
Content-Length: 0 Content-Length: 0
F6 180 Ringing Proxy 1 -> GW 1 F6 180 Ringing Proxy 1 -> GW 1
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
Content-Length: 0 Content-Length: 0
/* One way Voice path is established between GW and the PBX for /* One way Voice path is established between GW and the PBX for
ringing. */ ringing. */
F7 200 OK User B -> Proxy 1 F7 200 OK Bob -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 145 Content-Length: 146
v=0 v=0
o=UserB 2890844527 2890844527 IN IP4 client.biloxi.com o=bob 2890844527 2890844527 IN IP4 client.biloxi.com
s=- s=-
c=IN IP4 192.168.200.201 c=IN IP4 client.biloxi.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F8 200 OK Proxy 1 -> GW 1 F8 200 OK Proxy 1 -> GW 1
SIP/2.0 200 OK SIP/2.0 200 OK
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 67]
SIP PSTN Call Flows November 2002
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 145 Content-Length: 146
v=0 v=0
o=UserB 2890844527 2890844527 IN IP4 client.biloxi.com o=bob 2890844527 2890844527 IN IP4 client.biloxi.com
s=- s=-
c=IN IP4 192.168.200.201 c=IN IP4 client.biloxi.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F9 ACK GW 1 -> Proxy 1 F9 ACK GW 1 -> Proxy 1
ACK sip:UserB@192.168.200.201 SIP/2.0 ACK sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F10 ACK Proxy 1 -> User B F10 ACK Proxy 1 -> Bob
ACK sip:UserB@192.168.200.201 SIP/2.0 ACK sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
Max-Forwards: 69 Max-Forwards: 69
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
/* RTP streams are established between A and B (via the GW) */ /* RTP streams are established between A and B (via the GW) */
SIP PSTN Call Flows August 2002
/* User A Hangs Up with User B. */ Johnston et al Expires - May 2002 [Page 68]
SIP PSTN Call Flows November 2002
/* Alice Hangs Up with Bob. */
F11 BYE GW 1 -> Proxy 1 F11 BYE GW 1 -> Proxy 1
BYE sip:UserB@192.168.200.201 SIP/2.0 BYE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
Max-Forwards: 70 Max-Forwards: 70
Route: <sip:ss1.atlanta.com;lr> Route: <sip:ss1.atlanta.com;lr>
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F12 BYE Proxy 1 -> User B F12 BYE Proxy 1 -> Bob
BYE sip:UserB@192.168.200.201 SIP/2.0 BYE sip:bob@client.biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
Max-Forwards: 69 Max-Forwards: 69
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F13 200 OK User B -> Proxy 1 F13 200 OK Bob -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
F14 200 OK Proxy 1 -> GW 1 F14 200 OK Proxy 1 -> GW 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/UDP gw1.atlanta.com:5060;branch=z9hG4bKwqwee65
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm From: <sip:551313@gw1.atlanta.com;user=phone>;tag=jwdkallkzm
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 69]
SIP PSTN Call Flows November 2002
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 2 BYE CSeq: 2 BYE
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 70]
SIP PSTN Call Flows November 2002
3.4 Unsuccessful PSTN to SIP REL, SIP error mapped to REL 3.4 Unsuccessful PSTN to SIP REL, SIP error mapped to REL
Switch A GW 1 Proxy 1 User B Switch A GW 1 Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| | | |--------------->| |
| | 604 F3 | | | | 604 F3 | |
| |<---------------| | | |<---------------| |
| | ACK F4 | | | | ACK F4 | |
| |--------------->| | | |--------------->| |
| REL F5 | | | | REL F5 | | |
|<---------------| | | |<---------------| | |
| RLC F6 | | | | RLC F6 | | |
|--------------->| | | |--------------->| | |
| | | | | | | |
User A attempts to place a call through Gateway GW 1 and Proxy 1, Alice attempts to place a call through Gateway GW 1 and Proxy 1,
which is unable to find any routing for the number. The call is which is unable to find any routing for the number. The call is
rejected by Proxy 1 with a REL message containing a specific Cause rejected by Proxy 1 with a REL message containing a specific Cause
value mapped by the gateway based on the SIP error. value mapped by the gateway based on the SIP error.
Message Details Message Details
F1 IAM User A -> GW 1 F1 IAM Alice -> GW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=972-555-9999,NPI=E.164,NOA=National CdPN=972-555-9999,NPI=E.164,NOA=National
F2 INVITE A -> Proxy 1 F2 INVITE Alice -> Proxy 1
INVITE sip:+1972559999@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+1972559999@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@gw1.atlanta.com;user=phone>;tag=076342s From: <sip:+13145551111@gw1.atlanta.com;user=phone>;tag=076342s
To: <sip:+1972559999@ss1.atlanta.com;user=phone> To: <sip:+1972559999@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@gw1.atlanta.com;user=phone> Contact: <sip:+13145551111@gw1.atlanta.com;user=phone;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 140 Content-Length: 140
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 71]
SIP PSTN Call Flows November 2002
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service to find a route to +1-972-555- /* Proxy 1 uses a Location Service to find a route to +1-972-555-
9999. A route is not found, so Proxy 1 rejects the call. */ 9999. A route is not found, so Proxy 1 rejects the call. */
F3 604 Does Not Exist Anywhere Proxy 1 -> GW 1 F3 604 Does Not Exist Anywhere Proxy 1 -> GW 1
SIP/2.0 604 Does Not Exist Anywhere SIP/2.0 604 Does Not Exist Anywhere
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:+13145551111@gw1.atlanta.com;user=phone>;tag=076342s From: <sip:+13145551111@gw1.atlanta.com;user=phone>;tag=076342s
To: <sip:+1972559999@ss1.atlanta.com;user=phone>;tag=6a34d410 To: <sip:+1972559999@ss1.atlanta.com;user=phone>;tag=6a34d410
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Error-Info: <sip:does-not-exist@ann.atlanta.com> Error-Info: <sip:does-not-exist@ann.atlanta.com>
Content-Length: 0 Content-Length: 0
F4 ACK GW 1 -> Proxy 1 F4 ACK GW 1 -> Proxy 1
ACK sip:+1972559999@ss1.atlanta.com;user=phone SIP/2.0 ACK sip:+1972559999@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@gw1.atlanta.com;user=phone>;tag=076342s From: <sip:+13145551111@gw1.atlanta.com;user=phone>;tag=076342s
To: <sip:+1972559999@ss1.atlanta.com;user=phone>;tag=6a34d410 To: <sip:+1972559999@ss1.atlanta.com;user=phone>;tag=6a34d410
Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@gw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F5 REL GW 1 -> User A F5 REL GW 1 -> Alice
REL REL
CauseCode=1 CauseCode=1
F6 RLC User A -> GW 1 F6 RLC Alice -> GW 1
RLC RLC
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 72]
SIP PSTN Call Flows November 2002
3.5 Unsuccessful PSTN to SIP REL, SIP busy mapped to REL 3.5 Unsuccessful PSTN to SIP REL, SIP busy mapped to REL
Switch A NGW 1 Proxy 1 User B Switch A NGW 1 Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | 100 F4 |--------------->| | | 100 F4 |--------------->|
| |<---------------| | | |<---------------| |
| | | 600 F5 | | | | 600 F5 |
| | |<---------------| | | |<---------------|
| | | ACK F6 | | | | ACK F6 |
| | 600 F7 |--------------->| | | 600 F7 |--------------->|
| |<---------------| | | |<---------------| |
| | ACK F8 | | | | ACK F8 | |
| |--------------->| | | |--------------->| |
| REL(17) F9 | | | | REL(17) F9 | | |
|<---------------| | | |<---------------| | |
| RLC F10 | | | | RLC F10 | | |
|<-------------->| | | |<-------------->| | |
| | | | | | | |
In this scenario, User A calls User B through Network Gateway NGW 1 In this scenario, Alice calls Bob through Network Gateway NGW 1
and Proxy 1. The call is routed to User B by Proxy 1. The call is and Proxy 1. The call is routed to Bob by Proxy 1. The call is
rejected by User B who sends a 600 Busy Everywhere response. The rejected by Bob who sends a 600 Busy Everywhere response. The
Gateway sends a REL message containing a specific Cause value mapped Gateway sends a REL message containing a specific Cause value mapped
by the gateway based on the SIP error. by the gateway based on the SIP error.
Since no interworking is indicated in the IAM (F1), the busy tone is Since no interworking is indicated in the IAM (F1), the busy tone is
generated locally by User A's telephone switch. In scenario 5.2.3, generated locally by Alice's telephone switch. In some scenarios,
the busy signal is generated by the Gateway since interworking is the busy signal is generated by the Gateway since interworking is
indicated. For more discussion on interworking, refer to [4]. indicated. For more discussion on interworking, refer to [4].
Message Details Message Details
F1 IAM User A -> NGW 1 F1 IAM Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
F2 INVITE A -> Proxy 1 F2 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 73]
SIP PSTN Call Flows November 2002
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 140 Content-Length: 140
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine a route for /* Proxy 1 uses a Location Service function to determine a route for
+19725552222. The call is then forwarded to User B. */ +19725552222. The call is then forwarded to Bob. */
F3 INVITE F3 Proxy 1 -> User B F3 INVITE F3 Proxy 1 -> Bob
INVITE UserB@biloxi.com SIP/2.0 INVITE bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 140 Content-Length: 140
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 gw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.201 c=IN IP4 gw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying Proxy 1 -> NGW 1 F4 100 Trying Proxy 1 -> NGW 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
SIP PSTN Call Flows August 2002
;received=192.168.255.201 Johnston et al Expires - May 2002 [Page 74]
SIP PSTN Call Flows November 2002
;received=192.0.2.201
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 600 Busy Everywhere User B -> Proxy 1 F5 600 Busy Everywhere Bob -> Proxy 1
SIP/2.0 600 Busy Everywhere SIP/2.0 600 Busy Everywhere
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F6 ACK Proxy 1 -> User B F6 ACK Proxy 1 -> Bob
ACK UserB@biloxi.com SIP/2.0 ACK bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F7 600 Busy Everywhere Proxy 1 -> NGW 1 F7 600 Busy Everywhere Proxy 1 -> NGW 1
SIP/2.0 600 Busy Everywhere SIP/2.0 600 Busy Everywhere
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F8 ACK NGW 1 -> Proxy 1 F8 ACK NGW 1 -> Proxy 1
ACK UserB@biloxi.com SIP/2.0 ACK bob@biloxi.com SIP/2.0
SIP PSTN Call Flows August 2002
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Johnston et al Expires - May 2002 [Page 75]
SIP PSTN Call Flows November 2002
Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F9 REL NGW 1 -> User A F9 REL NGW 1 -> Alice
REL REL
CauseCode=17 Busy CauseCode=17 Busy
F10 RLC User A -> NGW 1 F10 RLC Alice -> NGW 1
RLC RLC
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 76]
SIP PSTN Call Flows November 2002
3.6 Unsuccessful PSTN->SIP, SIP error interworking to tones 3.6 Unsuccessful PSTN->SIP, SIP error interworking to tones
Switch A NGW 1 Proxy 1 User B Switch A NGW 1 Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | 100 F4 |--------------->| | | 100 F4 |--------------->|
| |<---------------| | | |<---------------| |
| | | 600 F5 | | | | 600 F5 |
| | |<---------------| | | |<---------------|
| | | ACK F6 | | | | ACK F6 |
| | 600 F7 |--------------->| | | 600 F7 |--------------->|
skipping to change at page 78, line 33 skipping to change at line 3470
| One Way Voice | | | | One Way Voice | | |
|<===============| | | |<===============| | |
| Busy Tone | | | | Busy Tone | | |
|<===============| | | |<===============| | |
| REL(16) F10 | | | | REL(16) F10 | | |
|--------------->| | | |--------------->| | |
| RLC F11 | | | | RLC F11 | | |
|<---------------| | | |<---------------| | |
| | | | | | | |
In this scenario, User A calls User B through Network Gateway NGW1 In this scenario, Alice calls Bob through Network Gateway NGW1
and Proxy 1. The call is routed to User B by Proxy 1. The call is and Proxy 1. The call is routed to Bob by Proxy 1. The call is
rejected by the User B client. NGW 1 sets up a two way voice path to rejected by the Bob client. NGW 1 sets up a two way voice path to
User A and plays busy tone. The caller then disconnects Alice and plays busy tone. The caller then disconnects
NGW 1 plays the busy tone since the IAM (F1) indicates the NGW 1 plays the busy tone since the IAM (F1) indicates the
interworking is present. In scenario 5.2.2, with no interworking, interworking is present. In scenario 5.2.2, with no interworking,
the busy indication is carried in the REL Cause value and is the busy indication is carried in the REL Cause value and is
generated locally instead. generated locally instead.
Again, note that for ETSI or ITU ISUP, a CONnect message would be Again, note that for ETSI or ITU ISUP, a CONnect message would be
sent instead of the Answer Message. sent instead of the Answer Message.
Message Details Message Details
F1 IAM User A -> NGW 1 F1 IAM Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 77]
SIP PSTN Call Flows November 2002
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
Interworking=encountered Interworking=encountered
F2 INVITE NGW1 -> Proxy 1 F2 INVITE NGW1 -> Proxy 1
INVITE sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine a route for /* Proxy 1 uses a Location Service function to determine a route for
+19725552222. The call is then forwarded to User B. */ +19725552222. The call is then forwarded to Bob. */
F3 INVITE Proxy 1 -> User B F3 INVITE Proxy 1 -> Bob
INVITE UserB@biloxi.com SIP/2.0 INVITE bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 78]
SIP PSTN Call Flows November 2002
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying User B -> Proxy 1 F4 100 Trying Bob -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 600 Busy Everywhere User B -> Proxy 1 F5 600 Busy Everywhere Bob -> Proxy 1
SIP/2.0 600 Busy Everywhere SIP/2.0 600 Busy Everywhere
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F6 ACK Proxy 1 -> User B F6 ACK Proxy 1 -> Bob
ACK UserB@biloxi.com SIP/2.0 ACK bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F7 600 Busy Everywhere Proxy 1 -> NGW 1 F7 600 Busy Everywhere Proxy 1 -> NGW 1
SIP/2.0 600 Busy Everywhere SIP/2.0 600 Busy Everywhere
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
SIP PSTN Call Flows August 2002
;received=192.168.255.101 Johnston et al Expires - May 2002 [Page 79]
SIP PSTN Call Flows November 2002
;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F8 ACK NGW 1 -> Proxy 1 F8 ACK NGW 1 -> Proxy 1
ACK sip:+19725552222@ngw1.atlanta.com;user=phone SIP/2.0 ACK sip:ngw1@atlanta.com SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F9 ACM NGW 1 -> User A F9 ACM NGW 1 -> Alice
ACM ACM
/* A one way speech path is established between NGW 1 and User A. */ /* A one way speech path is established between NGW 1 and Alice. */
/* Call Released after User A hangs up. */ /* Call Released after Alice hangs up. */
F10 REL User A -> NGW 1 F10 REL Alice -> NGW 1
REL REL
CauseCode=16 CauseCode=16
F11 RLC NGW 1 -> User A F11 RLC NGW 1 -> Alice
RLC RLC
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 80]
SIP PSTN Call Flows November 2002
3.7 Unsuccessful PSTN->SIP, ACM timeout 3.7 Unsuccessful PSTN->SIP, ACM timeout
Switch A NGW 1 Proxy 1 User B Switch A NGW 1 Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | 100 F4 |--------------->| | | 100 F4 |--------------->|
| |<---------------| | | |<---------------| |
| | | INVITE F5 | | | | INVITE F5 |
| | |--------------->| | | |--------------->|
| | | INVITE F6 | | | | INVITE F6 |
| | |--------------->| | | |--------------->|
skipping to change at page 82, line 34 skipping to change at line 3659
| | |--------------->| | | |--------------->|
| REL F10 | | | | REL F10 | | |
|--------------->| | | |--------------->| | |
| RLC F11 | | | | RLC F11 | | |
|<---------------| | | |<---------------| | |
| | CANCEL F12 | | | | CANCEL F12 | |
| |--------------->| | | |--------------->| |
| | 200 F13 | | | | 200 F13 | |
| |<---------------| | | |<---------------| |
User A calls User B through NGW 1 and Proxy 1. Proxy 1 re-sends the Alice calls Bob through NGW 1 and Proxy 1. Proxy 1 re-sends the
INVITE after the expiration of SIP timer T1 without receiving any INVITE after the expiration of SIP timer T1 without receiving any
response from User B. User B never responds with 180 Ringing or any response from Bob. Bob never responds with 180 Ringing or any
other response (it is reachable but unresponsive). After the other response (it is reachable but unresponsive). After the
expiration of a timer, User A's network disconnects the call by expiration of a timer, Alice's network disconnects the call by
sending a Release message REL. The Gateway maps this to a CANCEL. sending a Release message REL. The Gateway maps this to a CANCEL.
Message Details Message Details
F1 IAM User A -> NGW 1 F1 IAM Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
F2 INVITE A -> Proxy 1 F2 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 81]
SIP PSTN Call Flows November 2002
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine a route for /* Proxy 1 uses a Location Service function to determine a route for
+19725552222. The call is then forwarded to User B. */ +19725552222. The call is then forwarded to Bob. */
F3 INVITE Proxy 1 -> User B F3 INVITE Proxy 1 -> Bob
INVITE sip:UserB@biloxi.com SIP/2.0 INVITE sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
c c=IN IP4 192.168.255.101 c c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying Proxy 1 -> NGW 1 F4 100 Trying Proxy 1 -> NGW 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 82]
SIP PSTN Call Flows November 2002
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 INVITE Proxy 1 -> User B F5 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
F6 INVITE Proxy 1 -> User B F6 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
F7 INVITE Proxy 1 -> User B F7 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
F8 INVITE Proxy 1 -> User B F8 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
F9 INVITE Proxy 1 -> User B F9 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
/* Timer expires in User A's access network. */ /* Timer expires in Alice's access network. */
F10 REL User A -> NGW 1 F10 REL Alice -> NGW 1
REL REL
CauseCode=16 Normal CauseCode=16 Normal
F11 RLC NGW 1 -> User A F11 RLC NGW 1 -> Alice
RLC RLC
F12 CANCEL NGW 1 -> Proxy 1 F12 CANCEL NGW 1 -> Proxy 1
CANCEL sip:+19725552222@ss11.atlanta.com;user=phone SIP/2.0 CANCEL sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 83]
SIP PSTN Call Flows November 2002
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F13 200 OK Proxy 1 -> NGW 1 F13 200 OK Proxy 1 -> NGW 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 84]
SIP PSTN Call Flows November 2002
3.8 Unsuccessful PSTN->SIP, ACM timeout, stateless Proxy 3.8 Unsuccessful PSTN->SIP, ACM timeout, stateless Proxy
Switch A NGW 1 Stateless Proxy 1 User B Switch A NGW 1 Stateless Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | INVITE F4 |--------------->| | | INVITE F4 |--------------->|
| |--------------->| INVITE F5 | | |--------------->| INVITE F5 |
| | INVITE F6 |--------------->| | | INVITE F6 |--------------->|
| |--------------->| INVITE F7 | | |--------------->| INVITE F7 |
| | INVITE F8 |--------------->| | | INVITE F8 |--------------->|
| |--------------->| INVITE F9 | | |--------------->| INVITE F9 |
| | INVITE F10 |--------------->| | | INVITE F10 |--------------->|
| |--------------->| INVITE F11 | | |--------------->| INVITE F11 |
| | INVITE F12 |--------------->| | | INVITE F12 |--------------->|
| |--------------->| INVITE F13 | | |--------------->| INVITE F13 |
| | |--------------->| | | |--------------->|
| REL F14 | | | | REL F14 | | |
|--------------->| | | |--------------->| | |
| RLC F15 | | | | RLC F15 | | |
|<---------------| | | |<---------------| | |
In this scenario, User A calls User B through NGW 1 and Proxy 1. In this scenario, Alice calls Bob through NGW 1 and Proxy 1.
Since Proxy 1 is stateless (it does not send a 100 Trying response), Since Proxy 1 is stateless (it does not send a 100 Trying response),
NGW 1 re-sends the INVITE message after the expiration of NGW 1 re-sends the INVITE message after the expiration of
SIP timer T1. User B does not respond with 180 Ringing. User A's SIP timer T1. Bob does not respond with 180 Ringing. Alice's
network disconnects the call with a release REL (CauseCode=102 network disconnects the call with a release REL (CauseCode=102
Timeout). Timeout).
Message Details Message Details
F1 IAM User A -> NGW 1 F1 IAM Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
F2 INVITE NGW 1 -> Proxy 1 F2 INVITE NGW 1 -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 85]
SIP PSTN Call Flows November 2002
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine a route for /* Proxy 1 uses a Location Service function to determine a route for
+19725552222. The call is then forwarded to User B. */ +19725552222. The call is then forwarded to Bob. */
F3 INVITE Proxy 1 -> User B F3 INVITE Proxy 1 -> Bob
INVITE sip:UserB@biloxi.com SIP/2.0 INVITE sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
Max-Forwards: 69 Max-Forwards: 69
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 INVITE NGW 1 -> Proxy 1 F4 INVITE NGW 1 -> Proxy 1
Same as Message F2 Same as Message F2
F5 INVITE Proxy 1 -> User B F5 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 86]
SIP PSTN Call Flows November 2002
F6 INVITE NGW 1 -> Proxy 1 F6 INVITE NGW 1 -> Proxy 1
Same as Message F2 Same as Message F2
F7 INVITE Proxy 1 -> User B F7 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
F8 INVITE NGW 1 -> Proxy 1 F8 INVITE NGW 1 -> Proxy 1
Same as Message F2 Same as Message F2
F9 INVITE Proxy 1 -> User B F9 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
F10 INVITE NGW 1 -> Proxy 1 F10 INVITE NGW 1 -> Proxy 1
Same as Message F2 Same as Message F2
F11 INVITE Proxy 1 -> User B F11 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
F12 INVITE NGW 1 -> Proxy 1 F12 INVITE NGW 1 -> Proxy 1
Same as Message F2 Same as Message F2
F13 INVITE Proxy 1 -> User B F13 INVITE Proxy 1 -> Bob
Same as Message F3 Same as Message F3
/* A timer expires in User A's access network. */ /* A timer expires in Alice's access network. */
F14 REL User A -> NGW 1 F14 REL Alice -> NGW 1
REL REL
CauseCode=102 Timeout CauseCode=102 Timeout
SIP PSTN Call Flows August 2002
F15 RLC NGW 1 -> User A Johnston et al Expires - May 2002 [Page 87]
SIP PSTN Call Flows November 2002
F15 RLC NGW 1 -> Alice
RLC RLC
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 88]
SIP PSTN Call Flows November 2002
3.9 Unsuccessful PSTN->SIP, Caller Abandonment 3.9 Unsuccessful PSTN->SIP, Caller Abandonment
Switch A NGW 1 Proxy 1 User B Switch A NGW 1 Proxy 1 Bob
| | | | | | | |
| IAM F1 | | | | IAM F1 | | |
|--------------->| INVITE F2 | | |--------------->| INVITE F2 | |
| |--------------->| INVITE F3 | | |--------------->| INVITE F3 |
| | 100 F4 |--------------->| | | 100 F4 |--------------->|
| |<---------------| | | |<---------------| |
| | | 180 F5 | | | | 180 F5 |
| | 180 F6 |<---------------| | | 180 F6 |<---------------|
| ACM F7 |<---------------| | | ACM F7 |<---------------| |
|<---------------| | | |<---------------| | |
skipping to change at page 90, line 44 skipping to change at line 3986
| | |<---------------| | | |<---------------|
| | | 487 F14 | | | | 487 F14 |
| | |<---------------| | | |<---------------|
| | | ACK F15 | | | | ACK F15 |
| | 487 F16 |--------------->| | | 487 F16 |--------------->|
| |<---------------| | | |<---------------| |
| | ACK F17 | | | | ACK F17 | |
| |--------------->| | | |--------------->| |
| | | | | | | |
In this scenario, User A calls User B through NGW 1 and Proxy 1. In this scenario, Alice calls Bob through NGW 1 and Proxy 1.
User B does not respond with 200 OK. NGW 1 plays ringing tone since Bob does not respond with 200 OK. NGW 1 plays ringing tone since
the ACM indicates that interworking has been encountered. User A the ACM indicates that interworking has been encountered. Alice
disconnects the call with a Release message REL which is mapped by disconnects the call with a Release message REL which is mapped by
NGW 1 to a CANCEL. Note that if User B had sent a 200 OK response NGW 1 to a CANCEL. Note that if Bob had sent a 200 OK response
after the REL, NGW 1 would have sent an ACK then a BYE to properly after the REL, NGW 1 would have sent an ACK then a BYE to properly
terminate the call. terminate the call.
Message Details Message Details
SIP PSTN Call Flows August 2002
F1 IAM User A -> NGW 1 Johnston et al Expires - May 2002 [Page 89]
SIP PSTN Call Flows November 2002
F1 IAM Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=972-555-2222,NPI=E.164,NOA=National CdPN=972-555-2222,NPI=E.164,NOA=National
F2 INVITE A -> Proxy 1 F2 INVITE Alice -> Proxy 1
INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 INVITE sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 uses a Location Service function to determine a route for /* Proxy 1 uses a Location Service function to determine a route for
+19725552222. The call is then forwarded to User B. */ +19725552222. The call is then forwarded to Bob. */
F3 INVITE Proxy 1 -> User B F3 INVITE Proxy 1 -> Bob
INVITE sip:UserB@biloxi.com SIP/2.0 INVITE sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sip:ngw1@atlanta.com;transport=tcp>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 90]
SIP PSTN Call Flows November 2002
v=0 v=0
o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com o=GW 2890844527 2890844527 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 3456 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 100 Trying User B -> Proxy 1 F4 100 Trying Bob -> Proxy 1
SIP/2.0 100 Trying SIP/2.0 100 Trying
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.201 ;received=192.0.2.201
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F5 180 Ringing User B -> Proxy 1 F5 180 Ringing Bob -> Proxy 1
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com;transport=tcp>
Content-Length: 0 Content-Length: 0
F6 180 Ringing Proxy 1 -> NGW 1 F6 180 Ringing Proxy 1 -> NGW 1
SIP/2.0 180 Ringing SIP/2.0 180 Ringing
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sip:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 91]
SIP PSTN Call Flows November 2002
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:UserB@192.168.200.201> Contact: <sip:bob@client.biloxi.com>
Content-Length: 0 Content-Length: 0
F7 ACM NGW 1 -> User A F7 ACM NGW 1 -> Alice
ACM ACM
/* User A hangs up */ /* Alice hangs up */
F8 REL User A -> NGW 1 F8 REL Alice -> NGW 1
REL REL
CauseCode=16 Normal CauseCode=16 Normal
F9 RLC NGW 1 -> User A F9 RLC NGW 1 -> Alice
RLC RLC
F10 CANCEL NGW 1 -> Proxy 1 F10 CANCEL NGW 1 -> Proxy 1
CANCEL sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0 CANCEL sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F11 200 OK Proxy 1 -> NGW 1 F11 200 OK Proxy 1 -> NGW 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F12 CANCEL Proxy 1 -> User B F12 CANCEL Proxy 1 -> Bob
SIP PSTN Call Flows August 2002
CANCEL sip:UserB@biloxi.com SIP/2.0 Johnston et al Expires - May 2002 [Page 92]
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 SIP PSTN Call Flows November 2002
CANCEL sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F13 200 OK User B -> Proxy 1 F13 200 OK Bob -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone> To: <sip:+19725552222@ss1.atlanta.com;user=phone>
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 CANCEL CSeq: 1 CANCEL
Content-Length: 0 Content-Length: 0
F14 487 Request Terminated User B -> Proxy 1 F14 487 Request Terminated Bob -> Proxy 1
SIP/2.0 487 Request Terminated SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TCP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F15 ACK Proxy 1 -> User B F15 ACK Proxy 1 -> Bob
ACK sip:UserB@biloxi.com SIP/2.0 ACK sip:bob@biloxi.com SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
F16 487 Request Terminated Proxy 1 -> NGW 1 F16 487 Request Terminated Proxy 1 -> NGW 1
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 93]
SIP PSTN Call Flows November 2002
SIP/2.0 487 Request Terminated SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Content-Length: 0 Content-Length: 0
F17 ACK NGW 1 -> Proxy 1 F17 ACK NGW 1 -> Proxy 1
ACK sip:+19725552222@ss11.atlanta.com;user=phone SIP/2.0 ACK sip:+19725552222@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TCP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159 To: <sip:+19725552222@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com Call-ID: 4Fde34wkd11wsGFDs3@ngw1.atlanta.com
CSeq: 1 ACK CSeq: 1 ACK
Content-Length: 0 Content-Length: 0
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 94]
SIP PSTN Call Flows November 2002
4. PSTN to PSTN Dialing via SIP Network 4. PSTN to PSTN Dialing via SIP Network
In these scenarios, both the caller and the called party are in the In these scenarios, both the caller and the called party are in the
telephone network, either normal PSTN subscribers or PBX extensions. telephone network, either normal PSTN subscribers or PBX extensions.
The calls route through two Gateways and at least one SIP Proxy The calls route through two Gateways and at least one SIP Proxy
Server. The Proxy Server performs the authentication and location of Server. The Proxy Server performs the authentication and location of
the Gateways. the Gateways.
Again it is noted that the intent of this call flows document is not Again it is noted that the intent of this call flows document is not
to provide a detailed parameter level mapping of SIP to PSTN to provide a detailed parameter level mapping of SIP to PSTN
protocols. For information on SIP to ISUP mapping, the reader is protocols. For information on SIP to ISUP mapping, the reader is
referred to other references [4]. referred to other references [4].
In these scenarios, the call is successfully completed between the In these scenarios, the call is successfully completed between the
two Gateways allowing the PSTN or PBX users to communicate. The 183 two Gateways allowing the PSTN or PBX users to communicate. The 183
Session Progress response is used to indicate in-band alerting may Session Progress response is used to indicate in-band alerting may
flow from the called party telephone switch to the caller. flow from the called party telephone switch to the caller.
SIP PSTN Call Flows August 2002 Johnston et al Expires - May 2002 [Page 95]
SIP PSTN Call Flows November 2002
4.1 Successful ISUP PSTN to ISUP PSTN call 4.1 Successful ISUP PSTN to ISUP PSTN call
Switch A NGW 1 Proxy 1 GW 2 Switch C Switch A NGW 1 Proxy 1 GW 2 Switch C
| | | | | | | | | |
| IAM F1 | | | | | IAM F1 | | | |
|------------->| | | | |------------->| | | |
| | INVITE F2 | | | | | INVITE F2 | | |
| |------------->| INVITE F3 | | | |------------->| INVITE F3 | |
| | |------------->| IAM F4 | | | |------------->| IAM F4 |
skipping to change at page 97, line 49 skipping to change at line 4278
| | | | | | | | | |
| | 200 F19 | | | | | 200 F19 | | |
| |------------->| 200 F20 | | | |------------->| 200 F20 | |
| | |------------->| | | | |------------->| |
| REL F21 | | | | | REL F21 | | | |
|<-------------| | | | |<-------------| | | |
| RLC F22 | | | | | RLC F22 | | | |
|------------->| | | | |------------->| | | |
| | | | | | | | | |
In this scenario, User A in the PSTN calls User C who is an extension In this scenario, Alice in the PSTN calls Carol who is an extension
on a PBX. User A's telephone switch signals via SS7 to the Network on a PBX. Alice's telephone switch signals via SS7 to the Network
Gateway NGW 1, while User C's PBX signals via SS7 with the Gateway NGW 1, while Carol's PBX signals via SS7 with the
Gateway GW 2. The CdPN and CgPN are mapped by GW1 into SIP URIs and Gateway GW 2. The CdPN and CgPN are mapped by GW1 into SIP URIs and
placed in the To and From headers. Proxy 1 looks up the dialed placed in the To and From headers. Proxy 1 looks up the dialed
digits in the Request-URI and maps the digits to the PBX extension of digits in the Request-URI and maps the digits to the PBX extension of
SIP PSTN Call Flows August 2002
User C which is served by GW 2. The Proxy in F3 uses the host Johnston et al Expires - May 2002 [Page 96]
portion of the Request-URI to identify what private dialing plan is SIP PSTN Call Flows November 2002
being referenced. The INVITE is then forwarded to GW 2 for call
completion. An early media path is established end-to-end so that
User A can hear the ringing tone generated by PBX C.
User C answers the call and the media path is cut through in both Carol which is served by GW 2. The Proxy in F3 uses the host portion
directions. User B hangs up terminating the call. of the Request-URI to identify what private dialing plan is being
referenced. The INVITE is then forwarded to GW 2 for call completion.
An early media path is established end-to-end so that Alice can hear
the ringing tone generated by PBX C.
Carol answers the call and the media path is cut through in both
directions. Bob hangs up terminating the call.
Message Details Message Details
F1 IAM Switch A -> NGW 1 F1 IAM Switch Alice -> NGW 1
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=918-555-3333,NPI=E.164,NOA=National CdPN=918-555-3333,NPI=E.164,NOA=National
F2 INVITE NGW 1 -> Proxy 1 F2 INVITE NGW 1 -> Proxy 1
INVITE sip:+19185553333@ss1.atlanta.com;user=phone SIP/2.0 INVITE sips:+19185553333@ss1.atlanta.com;user=phone SIP/2.0
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TLS ngw1.atlanta.com:5061;branch=z9hG4bKlueha2
Max-Forwards: 70 Max-Forwards: 70
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sips:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19185553333@ss1.atlanta.com;user=phone> To: <sips:+19185553333@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sips:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844526 2890844526 IN IP4 gw1.atlanta.com o=GW 2890844526 2890844526 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* Proxy 1 consults Location Service and translates the dialed number /* Proxy 1 consults Location Service and translates the dialed number
to a private number in the Request-URI*/ to a private number in the Request-URI*/
F3 INVITE Proxy 1 -> GW 2 F3 INVITE Proxy 1 -> GW 2
INVITE sip:4443333@gw2.atlanta.com SIP/2.0 INVITE sips:4443333@gw2.atlanta.com SIP/2.0
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKwqwee65 Via: SIP/2.0/TLS ngw1.atlanta.com:5061;branch=z9hG4bKwqwee65
SIP PSTN Call Flows August 2002
;received=192.168.255.101 Johnston et al Expires - May 2002 [Page 97]
SIP PSTN Call Flows November 2002
;received=192.0.2.103
Max-Forwards: 69 Max-Forwards: 69
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sips:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19185553333@ss1.atlanta.com;user=phone> To: <sips:+19185553333@ss1.atlanta.com;user=phone>
Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:+13145551111@ngw1.atlanta.com;user=phone> Contact: <sips:ngw1@atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 141 Content-Length: 142
v=0 v=0
o=GW 2890844526 2890844526 IN IP4 ngw1.atlanta.com o=GW 2890844526 2890844526 IN IP4 ngw1.atlanta.com
s=- s=-
c=IN IP4 192.168.255.101 c=IN IP4 ngw1.atlanta.com
t=0 0 t=0 0
m=audio 49172 RTP/AVP 0 m=audio 3456 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F4 IAM GW 2 -> Switch C F4 IAM GW 2 -> Switch C
IAM IAM
CgPN=314-555-1111,NPI=E.164,NOA=National CgPN=314-555-1111,NPI=E.164,NOA=National
CdPN=444-3333,NPI=Private,NOA=Subscriber CdPN=444-3333,NPI=Private,NOA=Subscriber
F5 ACM Switch C -> GW 2 F5 ACM Switch C -> GW 2
ACM ACM
/* Based on the ACM message, GW 2 returns a 183 response. In-band /* Based on the ACM message, GW 2 returns a 183 response. In-band
call progress indications are sent to User A through NGW 1. */ call progress indications are sent to Alice through NGW 1. */
F6 183 Session Progress GW 2 -> Proxy 1 F6 183 Session Progress GW 2 -> Proxy 1
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TLS ngw1.atlanta.com:5061;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sips:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19185553333@ss1.atlanta.com;user=phone>;tag=314159 To: <sips:+19185553333@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:4443333@gw2.atlanta.com> Contact: <sips:4443333@gw2.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 98]
SIP PSTN Call Flows November 2002
Content-Length: 149 Content-Length: 149
v=0 v=0
o=GW 987654321 987654321 IN IP4 gw2.atlanta.com o=GW 987654321 987654321 IN IP4 gw2.atlanta.com
s=- s=-
c=IN IP4 192.168.255.202 c=IN IP4 gw2.atlanta.com
t=0 0 t=0 0
m=audio 14918 RTP/AVP 0 m=audio 14918 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F7 183 Session Progress Proxy 1 -> GW 1 F7 183 Session Progress Proxy 1 -> GW 1
SIP/2.0 183 Session Progress SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TLS ngw1.atlanta.com:5061;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sips:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19185553333@ss1.atlanta.com;user=phone>;tag=314159 To: <sips:+19185553333@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:4443333@gw2.atlanta.com> Contact: <sips:4443333@gw2.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 149 Content-Length: 149
v=0 v=0
o=GW 987654321 987654321 IN IP4 gw2.atlanta.com o=GW 987654321 987654321 IN IP4 gw2.atlanta.com
s=- s=-
c=IN IP4 192.168.255.202 c=IN IP4 gw2.atlanta.com
t=0 0 t=0 0
m=audio 14918 RTP/AVP 0 m=audio 14918 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
/* NGW 1 receives packets from GW 2 with encoded ringback, tones or /* NGW 1 receives packets from GW 2 with encoded ringback, tones or
other audio. NGW 1 decodes this and places it on the originating other audio. NGW 1 decodes this and places it on the originating
trunk. */ trunk. */
F8 ACM NGW 1 -> Switch A F8 ACM NGW 1 -> Switch A
ACM ACM
/* User B answers */ /* Bob answers */
F9 ANM Switch C -> GW 2 F9 ANM Switch C -> GW 2
ANM ANM
SIP PSTN Call Flows August 2002
Johnston et al Expires - May 2002 [Page 99]
SIP PSTN Call Flows November 2002
F10 200 OK GW 2 -> Proxy 1 F10 200 OK GW 2 -> Proxy 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ss1.atlanta.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/TLS ss1.atlanta.com:5061;branch=z9hG4bK2d4790.1
;received=192.168.255.111 ;received=192.0.2.111
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TLS ngw1.atlanta.com:5061;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sips:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19185553333@ss1.atlanta.com;user=phone>;tag=314159 To: <sips:+19185553333@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:4443333@gw2.atlanta.com> Contact: <sips:4443333@gw2.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp
Content-Length: 149 Content-Length: 149
v=0 v=0
o=GW 987654321 987654321 IN IP4 gw2.atlanta.com o=GW 987654321 987654321 IN IP4 gw2.atlanta.com
s=- s=-
c=IN IP4 192.168.255.202 c=IN IP4 gw2.atlanta.com
t=0 0 t=0 0
m=audio 14918 RTP/AVP 0 m=audio 14918 RTP/AVP 0
a=rtpmap:0 PCMU/8000 a=rtpmap:0 PCMU/8000
F11 200 OK Proxy 1 -> NGW 1 F11 200 OK Proxy 1 -> NGW 1
SIP/2.0 200 OK SIP/2.0 200 OK
Via: SIP/2.0/UDP ngw1.atlanta.com:5060;branch=z9hG4bKlueha2 Via: SIP/2.0/TLS ngw1.atlanta.com:5061;branch=z9hG4bKlueha2
;received=192.168.255.101 ;received=192.0.2.103
Record-Route: <sip:ss1.atlanta.com;lr> Record-Route: <sips:ss1.atlanta.com;lr>
From: <sip:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals From: <sips:+13145551111@ngw1.atlanta.com;user=phone>;tag=7643kals
To: <sip:+19185553333@ss1.atlanta.com;user=phone>;tag=314159 To: <sips:+19185553333@ss1.atlanta.com;user=phone>;tag=314159
Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com Call-ID: 2xTb9vxSit55XU7p8@ngw1.atlanta.com
CSeq: 1 INVITE CSeq: 1 INVITE
Contact: <sip:4443333@gw2.atlanta.com> Contact: <sips:4443333@gw2.atlanta.com>
Content-Type: application/sdp Content-Type: application/sdp