Private Session Initiation Protocol (SIP) Extensions for Media Authorization
RFC 3313
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Type |
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RFC - Informational
(January 2003; No errata)
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Last updated |
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2015-10-14
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IETF
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plain text
pdf
html
bibtex
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WG state
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(None)
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Document shepherd |
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No shepherd assigned
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| IESG |
IESG state |
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RFC 3313 (Informational)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Allison Mankin
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IESG note |
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Responsible: RFC Editor
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Send notices to |
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<rohan@cisco.com>
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Network Working Group W. Marshall, Ed.
Request for Comments: 3313 AT&T
Category: Informational January 2003
Private Session Initiation Protocol (SIP) Extensions
for Media Authorization
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document describes the need for Quality of Service (QoS) and
media authorization and defines a Session Initiation Protocol (SIP)
extension that can be used to integrate QoS admission control with
call signaling and help guard against denial of service attacks. The
use of this extension is only applicable in administrative domains,
or among federations of administrative domains with previously
agreed-upon policies, where both the SIP proxy authorizing the QoS,
and the policy control of the underlying network providing the QoS,
belong to that administrative domain or federation of domains.
Marshall, Ed. Informational [Page 1]
RFC 3313 SIP Extensions for Media Authorization January 2003
Table of Contents
1. Scope of Applicability......................................... 2
2. Conventions Used in this Document.............................. 3
3. Background and Motivation...................................... 3
4. Overview....................................................... 4
5. Changes to SIP to Support Media Authorization.................. 4
5.1 SIP Header Extension....................................... 5
5.2 SIP Procedures............................................. 5
5.2.1 User Agent Client (UAC)................................ 6
5.2.2 User Agent Server (UAS)................................ 6
5.2.3 Originating Proxy (OP)................................. 7
5.2.4 Destination Proxy (DP)................................. 7
6. Examples....................................................... 8
6.1 Requesting Bandwidth via RSVP Messaging.................... 8
6.1.1 User Agent Client Side................................. 8
6.1.2 User Agent Server Side................................. 10
7. Advantages of the Proposed Approach............................ 12
8. Security Considerations........................................ 13
9. IANA Considerations............................................ 13
10. Notice Regarding Intellectual Property Rights................. 13
11. Normative References.......................................... 14
12. Informative References........................................ 14
13. Contributors.................................................. 15
14. Acknowledgments............................................... 15
15. Editor's Address.............................................. 15
16. Full Copyright Statement...................................... 16
1. Scope of Applicability
This document defines a SIP extension that can be used to integrate
QoS admission control with call signaling and help guard against
denial of service attacks. The use of this extension is only
applicable in administrative domains, or among federations of
administrative domains with previously agreed-upon policies, where
both the SIP proxy authorizing the QoS, and the policy control of the
underlying network providing the QoS, belong to that administrative
domain or federation of domains. Furthermore, the mechanism is
generally incompatible with end-to-end encryption of message bodies
that describe media sessions.
This is in contrast with general Internet principles, which separate
data transport from applications. Thus, the solution described in
this document is not applicable to the Internet at large. Despite
these limitations, there are sufficiently useful specialized
deployments that meet the assumptions described above, and can accept
the limitations that result, to warrant informational publication of
this mechanism. An example deployment would be a closed network,
Marshall, Ed. Informational [Page 2]
RFC 3313 SIP Extensions for Media Authorization January 2003
which emulates a traditional circuit switched telephone network.
This document specifies a private header, facilitating use in these
specialized configurations.
2. Conventions Used in this Document
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