draft-ietf-bliss-call-park-extension-00.txt   draft-ietf-bliss-call-park-extension-01.txt 
BLISS M. Procter BLISS M. Procter
Internet-Draft VoIP.co.uk Internet-Draft VoIP.co.uk
Intended status: Informational June 28, 2009 Intended status: Informational October 14, 2009
Expires: December 30, 2009 Expires: April 17, 2010
Implementing Call Park and Retrieve using the Session Initiation Implementing Call Park and Retrieve using the Session Initiation
Protocol (SIP) Protocol (SIP)
draft-ietf-bliss-call-park-extension-00 draft-ietf-bliss-call-park-extension-01
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. This document may contain material provisions of BCP 78 and BCP 79. This document may contain material
from IETF Documents or IETF Contributions published or made publicly from IETF Documents or IETF Contributions published or made publicly
available before November 10, 2008. The person(s) controlling the available before November 10, 2008. The person(s) controlling the
copyright in some of this material may not have granted the IETF copyright in some of this material may not have granted the IETF
Trust the right to allow modifications of such material outside the Trust the right to allow modifications of such material outside the
IETF Standards Process. Without obtaining an adequate license from IETF Standards Process. Without obtaining an adequate license from
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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 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.
This Internet-Draft will expire on December 30, 2009. This Internet-Draft will expire on April 17, 2010.
Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info). publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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6.1. Parking by blind transfer . . . . . . . . . . . . . . . . 15 6.1. Parking by blind transfer . . . . . . . . . . . . . . . . 15
6.2. Parking by blind transfer with central allocation . . . . 15 6.2. Parking by blind transfer with central allocation . . . . 15
6.3. Parking with orbit parameters . . . . . . . . . . . . . . 16 6.3. Parking with orbit parameters . . . . . . . . . . . . . . 16
6.4. Parking on the User Agent . . . . . . . . . . . . . . . . 16 6.4. Parking on the User Agent . . . . . . . . . . . . . . . . 16
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
8. Security Considerations . . . . . . . . . . . . . . . . . . . 17 8. Security Considerations . . . . . . . . . . . . . . . . . . . 17
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10.1. Normative References . . . . . . . . . . . . . . . . . . . 18 10.1. Normative References . . . . . . . . . . . . . . . . . . . 18
10.2. Informative References . . . . . . . . . . . . . . . . . . 18 10.2. Informative References . . . . . . . . . . . . . . . . . . 18
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 19 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 18
1. Overview 1. Overview
Call Park is a feature that enables User Agents (UA) to make a call Call Park is a feature that enables User Agents (UA) to make a call
inactive but not terminated, in such a way as to allow the call to be inactive but not terminated, in such a way as to allow the call to be
resumed by the UA that parked the call, or by a different UA. resumed by the UA that parked the call, or by a different UA.
This feature is typically used when User A wishes to transfer a call This feature is typically used when User A wishes to transfer a call
in progress to User B, but doesn't necessarily know how to reach User in progress to User B, but doesn't necessarily know how to reach User
B's UA directly. In this situation, User A parks the call, and then B's UA directly. In this situation, User A parks the call, and then
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administrative policies for orbit allocation, it is likely to be administrative policies for orbit allocation, it is likely to be
easily guessable. Because of this, knowledge of the 'orbit' should easily guessable. Because of this, knowledge of the 'orbit' should
not be considered to be an indication of authorisation to manipulate not be considered to be an indication of authorisation to manipulate
a parked call. The Park Server should ensure that any UA attempting a parked call. The Park Server should ensure that any UA attempting
to park a call or retrieve a parked call is suitably authorised, to park a call or retrieve a parked call is suitably authorised,
regardless of whether or not a valid orbit is present in the SIP regardless of whether or not a valid orbit is present in the SIP
messaging. messaging.
9. IANA Considerations 9. IANA Considerations
Open issue: According to [RFC3969], defining a URI parameter can only
be done in a standards-track RFC. That doesn't sound like the sort
of thing this document will do, nor the sort of thing BLISS will do
either. However, [RFC4240] ('netann') defines values that are
included in the current registry, and it is most definately
'Informational'.
This specification adds a new value to the IANA "SIP/SIPS URI This specification adds a new value to the IANA "SIP/SIPS URI
Parameters" registry as defined in [RFC3969]. Parameters" registry as defined in [RFC3969].
Parameter Name Predefined Values Reference Parameter Name Predefined Values Reference
____________________________________________ ____________________________________________
orbit No RFCxxxx orbit No RFCxxxx
The ABNF [RFC5234] grammar for this parameter is shown below. The The ABNF [RFC5234] grammar for this parameter is shown below. The
definition of 'pvalue' is given in [RFC3261]. definition of 'pvalue' is given in [RFC3261].
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[RFC3891] Mahy, R., Biggs, B., and R. Dean, "The Session Initiation [RFC3891] Mahy, R., Biggs, B., and R. Dean, "The Session Initiation
Protocol (SIP) "Replaces" Header", RFC 3891, Protocol (SIP) "Replaces" Header", RFC 3891,
September 2004. September 2004.
10.2. Informative References 10.2. Informative References
[RFC4579] Johnston, A. and O. Levin, "Session Initiation Protocol [RFC4579] Johnston, A. and O. Levin, "Session Initiation Protocol
(SIP) Call Control - Conferencing for User Agents", (SIP) Call Control - Conferencing for User Agents",
BCP 119, RFC 4579, August 2006. BCP 119, RFC 4579, August 2006.
[RFC4240] Burger, E., Van Dyke, J., and A. Spitzer, "Basic Network
Media Services with SIP", RFC 4240, December 2005.
[I-D.ietf-sip-gruu] [I-D.ietf-sip-gruu]
Rosenberg, J., "Obtaining and Using Globally Routable User Rosenberg, J., "Obtaining and Using Globally Routable User
Agent (UA) URIs (GRUU) in the Session Initiation Protocol Agent (UA) URIs (GRUU) in the Session Initiation Protocol
(SIP)", draft-ietf-sip-gruu-15 (work in progress), (SIP)", draft-ietf-sip-gruu-15 (work in progress),
October 2007. October 2007.
[I-D.ietf-sip-ua-privacy] [I-D.ietf-sip-ua-privacy]
Munakata, M., Schubert, S., and T. Ohba, "UA-Driven Munakata, M., Schubert, S., and T. Ohba, "UA-Driven
Privacy Mechanism for SIP", draft-ietf-sip-ua-privacy-08 Privacy Mechanism for SIP", draft-ietf-sip-ua-privacy-08
(work in progress), May 2009. (work in progress), May 2009.
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