draft-ietf-sipping-early-disposition-02.txt   draft-ietf-sipping-early-disposition-03.txt 
SIPPING Working Group G. Camarillo SIPPING Working Group G. Camarillo
Internet-Draft Ericsson Internet-Draft Ericsson
Expires: September 30, 2004 April 2004 Expires: December 15, 2004 June 16, 2004
The Early Session Disposition Type for the Session Initiation The Early Session Disposition Type for the Session Initiation
Protocol (SIP) Protocol (SIP)
draft-ietf-sipping-early-disposition-02.txt draft-ietf-sipping-early-disposition-03.txt
Status of this Memo Status of this Memo
By submitting this Internet-Draft, I certify that any applicable By submitting this Internet-Draft, I certify that any applicable
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and any of which I become aware will be disclosed, in accordance with and any of which I become aware will be disclosed, in accordance with
RFC 3668. RFC 3668.
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 other Task Force (IETF), its areas, and its working groups. Note that other
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
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 http:// The list of current Internet-Drafts can be accessed at http://
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This Internet-Draft will expire on September 30, 2004. This Internet-Draft will expire on December 15, 2004.
Copyright Notice Copyright Notice
Copyright (C) The Internet Society (2004). All Rights Reserved. Copyright (C) The Internet Society (2004). All Rights Reserved.
Abstract Abstract
This document defines a new disposition type (early-session) for the This document defines a new disposition type (early-session) for the
Content-Disposition header field in SIP. The treatment of Content-Disposition header field in SIP. The treatment of
"early-session" bodies is similar to the treatment of "session" "early-session" bodies is similar to the treatment of "session"
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|----------(6) ACK--------->| |----------(6) ACK--------->|
| | | |
Figure 1: Message flow Figure 1: Message flow
Content-Type: application/sdp Content-Type: application/sdp
Content-Disposition: session Content-Disposition: session
v=0 v=0
o=alice 2890844730 2890844731 IN IP4 host.example.com o=alice 2890844730 2890844731 IN IP4 host.example.com
s= s=
c=IN IP4 192.0.0.1 c=IN IP4 192.0.2.1
t=0 0 t=0 0
m=audio 20000 RTP/AVP 0 m=audio 20000 RTP/AVP 0
Figure 2: Offer Figure 2: Offer
Content-Type: multipart/mixed; boundary="boundary1" Content-Type: multipart/mixed; boundary="boundary1"
Content-Length: 401 Content-Length: 401
--boundary1 --boundary1
Content-Type: application/sdp Content-Type: application/sdp
Content-Disposition: session Content-Disposition: session
v=0 v=0
o=Bob 2890844725 2890844725 IN IP4 host.example2.com o=Bob 2890844725 2890844725 IN IP4 host.example.org
s= s=
c=IN IP4 192.0.0.2 c=IN IP4 192.0.2.2
t=0 0 t=0 0
m=audio 30000 RTP/AVP 0 m=audio 30000 RTP/AVP 0
--boundary1 --boundary1
Content-Type: application/sdp Content-Type: application/sdp
Content-Disposition: early-session Content-Disposition: early-session
v=0 v=0
o=Bob 2890844714 2890844714 IN IP4 host.example2.com o=Bob 2890844714 2890844714 IN IP4 host.example.org
s= s=
c=IN IP4 192.0.0.2 c=IN IP4 192.0.2.2
t=0 0 t=0 0
m=audio 30002 RTP/AVP 0 m=audio 30002 RTP/AVP 0
--boundary1-- --boundary1--
Figure 3: Early offer and answer Figure 3: Early offer and answer
Content-Type: application/sdp Content-Type: application/sdp
Content-Disposition: early-session Content-Disposition: early-session
v=0 v=0
o=alice 2890844717 2890844717 IN IP4 host.example.com o=alice 2890844717 2890844717 IN IP4 host.example.com
s= s=
c=IN IP4 192.0.0.1 c=IN IP4 192.0.2.1
t=0 0 t=0 0
m=audio 20002 RTP/AVP 0 m=audio 20002 RTP/AVP 0
Figure 4: Answer Figure 4: Early answer
8. Security Considerations 8. Security Considerations
The security implications of using early-session bodies in SIP are The security implications of using early-session bodies in SIP are
the same as the ones of using session bodies; they are part of the the same as the ones of using session bodies; they are part of the
offer/answer model. offer/answer model.
SIP uses the offer/answer model [3] to establish early sessions in SIP uses the offer/answer model [3] to establish early sessions in
both the gateway and the application server models. User Agents (UAs) both the gateway and the application server models. User Agents (UAs)
generate a session description, which contains the transport address generate a session description, which contains the transport address
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