Session Initiation Protocol (SIP) Extension for Instant Messaging
RFC 3428
| Document | Type |
RFC - Proposed Standard
(December 2002; Errata)
Updated by RFC 8591
Was draft-ietf-sip-message (sip WG)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 3428 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Allison Mankin | ||
| IESG note | Published 2002-12-06 | ||
| Send notices to | <rohan@cisco.com> | ||
Network Working Group B. Campbell, Ed.
Request for Comments: 3428 J. Rosenberg
Category: Standards Track dynamicsoft
H. Schulzrinne
Columbia University
C. Huitema
D. Gurle
Microsoft Corporation
December 2002
Session Initiation Protocol (SIP) Extension for Instant Messaging
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
Instant Messaging (IM) refers to the transfer of messages between
users in near real-time. These messages are usually, but not
required to be, short. IMs are often used in a conversational mode,
that is, the transfer of messages back and forth is fast enough for
participants to maintain an interactive conversation.
This document proposes the MESSAGE method, an extension to the
Session Initiation Protocol (SIP) that allows the transfer of Instant
Messages. Since the MESSAGE request is an extension to SIP, it
inherits all the request routing and security features of that
protocol. MESSAGE requests carry the content in the form of MIME
body parts. MESSAGE requests do not themselves initiate a SIP
dialog; under normal usage each Instant Message stands alone, much
like pager messages. MESSAGE requests may be sent in the context of
a dialog initiated by some other SIP request.
Campbell, et. al. Standards Track [Page 1]
RFC 3428 SIP Message Extension December 2002
Terminology
In this document, the key words "MUST", "MUST NOT", "REQUIRED",
"SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT
RECOMMENDED", "MAY" and "OPTIONAL" are to be interpreted as described
in BCP 14, RFC 2119 [6] and indicate requirement levels for compliant
SIP implementations.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Scope of Applicability . . . . . . . . . . . . . . . . . . . 3
3. Overview of Operation . . . . . . . . . . . . . . . . . . . 4
4. UAC Processing . . . . . . . . . . . . . . . . . . . . . . . 5
5. Use of Instant Message URIs . . . . . . . . . . . . . . . . 6
6. Proxy Processing . . . . . . . . . . . . . . . . . . . . . . 6
7. UAS Processing . . . . . . . . . . . . . . . . . . . . . . . 7
8. Congestion Control . . . . . . . . . . . . . . . . . . . . . 8
9. Method Definition . . . . . . . . . . . . . . . . . . . . . 9
10. Example Messages . . . . . . . . . . . . . . . . . . . . . . 11
11. Security Considerations . . . . . . . . . . . . . . . . . . 13
11.1 Outbound authentication . . . . . . . . . . . . . . . . . . 13
11.2 SIPS URIs . . . . . . . . . . . . . . . . . . . . . . . . . 14
11.3 End-to-End Protection . . . . . . . . . . . . . . . . . . . 14
11.4 Replay Prevention . . . . . . . . . . . . . . . . . . . . . 14
11.5 Using message/cpim bodies . . . . . . . . . . . . . . . . . 15
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . 15
13. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 15
14. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . 15
15. Normative References . . . . . . . . . . . . . . . . . . . . 16
16. Informational References . . . . . . . . . . . . . . . . . . 16
17. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . 17
18. Full Copyright Statement . . . . . . . . . . . . . . . . . . 18
1. Introduction
Instant Messaging (IM) is defined as the exchange of content between
a set of participants in near real time. Generally, the content is
short text messages, although that need not be the case. Generally,
the messages that are exchanged are not stored, but this also need
not be the case. IM differs from email in common usage in that
instant messages are usually grouped together into brief live
conversations, consisting of numerous small messages sent back and
forth.
Instant messaging as a service has been in existence within intranets
and IP networks for quite some time. Early implementations include
zephyr [11], the UNIX talk application, and IRC. More recently, IM
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