Network Working Group J. Rosenberg
Request for Comments: 3261 dynamicsoft
Obsoletes: 2543 H. Schulzrinne
Category: Standards Track Columbia U.
G. Camarillo
Ericsson
A. Johnston
WorldCom
J. Peterson
Neustar
R. Sparks
dynamicsoft
M. Handley
ICIR
E. Schooler
AT&T
June 2002
SIP: Session Initiation Protocol
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
This document describes Session Initiation Protocol (SIP), an
application-layer control (signaling) protocol for creating,
modifying, and terminating sessions with one or more participants.
These sessions include Internet telephone calls, multimedia
distribution, and multimedia conferences.
SIP invitations used to create sessions carry session descriptions
that allow participants to agree on a set of compatible media types.
SIP makes use of elements called proxy servers to help route requests
to the user's current location, authenticate and authorize users for
services, implement provider call-routing policies, and provide
features to users. SIP also provides a registration function that
allows users to upload their current locations for use by proxy
servers. SIP runs on top of several different transport protocols.
Rosenberg, et. al. Standards Track [Page 1]
RFC 3261 SIP: Session Initiation Protocol June 2002
Table of Contents
1 Introduction ........................................ 8
2 Overview of SIP Functionality ....................... 9
3 Terminology ......................................... 10
4 Overview of Operation ............................... 10
5 Structure of the Protocol ........................... 18
6 Definitions ......................................... 20
7 SIP Messages ........................................ 26
7.1 Requests ............................................ 27
7.2 Responses ........................................... 28
7.3 Header Fields ....................................... 29
7.3.1 Header Field Format ................................. 30
7.3.2 Header Field Classification ......................... 32
7.3.3 Compact Form ........................................ 32
7.4 Bodies .............................................. 33
7.4.1 Message Body Type ................................... 33
7.4.2 Message Body Length ................................. 33
7.5 Framing SIP Messages ................................ 34
8 General User Agent Behavior ......................... 34
8.1 UAC Behavior ........................................ 35
8.1.1 Generating the Request .............................. 35
8.1.1.1 Request-URI ......................................... 35
8.1.1.2 To .................................................. 36
8.1.1.3 From ................................................ 37
8.1.1.4 Call-ID ............................................. 37
8.1.1.5 CSeq ................................................ 38
8.1.1.6 Max-Forwards ........................................ 38
8.1.1.7 Via ................................................. 39
8.1.1.8 Contact ............................................. 40
8.1.1.9 Supported and Require ............................... 40
8.1.1.10 Additional Message Components ....................... 41
8.1.2 Sending the Request ................................. 41
8.1.3 Processing Responses ................................ 42
8.1.3.1 Transaction Layer Errors ............................ 42
8.1.3.2 Unrecognized Responses .............................. 42
8.1.3.3 Vias ................................................ 43
8.1.3.4 Processing 3xx Responses ............................ 43
8.1.3.5 Processing 4xx Responses ............................ 45
8.2 UAS Behavior ........................................ 46
8.2.1 Method Inspection ................................... 46
8.2.2 Header Inspection ................................... 46
8.2.2.1 To and Request-URI .................................. 46
8.2.2.2 Merged Requests ..................................... 47
8.2.2.3 Require ............................................. 47
8.2.3 Content Processing .................................. 48
8.2.4 Applying Extensions ................................. 49
8.2.5 Processing the Request .............................. 49
Rosenberg, et. al. Standards Track [Page 2]
RFC 3261 SIP: Session Initiation Protocol June 2002
8.2.6 Generating the Response ............................. 49
8.2.6.1 Sending a Provisional Response ...................... 49
8.2.6.2 Headers and Tags .................................... 50
8.2.7 Stateless UAS Behavior .............................. 50
8.3 Redirect Servers .................................... 51
9 Canceling a Request ................................. 53
9.1 Client Behavior ..................................... 53
9.2 Server Behavior ..................................... 55
10 Registrations ....................................... 56
10.1 Overview ............................................ 56
10.2 Constructing the REGISTER Request ................... 57
10.2.1 Adding Bindings ..................................... 59
10.2.1.1 Setting the Expiration Interval of Contact Addresses 60
10.2.1.2 Preferences among Contact Addresses ................. 61
10.2.2 Removing Bindings ................................... 61
10.2.3 Fetching Bindings ................................... 61
10.2.4 Refreshing Bindings ................................. 61
10.2.5 Setting the Internal Clock .......................... 62
10.2.6 Discovering a Registrar ............................. 62
10.2.7 Transmitting a Request .............................. 62
10.2.8 Error Responses ..................................... 63
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SIP.zip （47个子文件） 
SIP 
rfc4488.txt 17KB rfc3841.txt 61KB rfc5362.txt 32KB rfc5628.txt 31KB rfc4904.txt 41KB rfc4575.txt 98KB rfc4412.txt 79KB rfc3911.txt 35KB rfc4740.txt 174KB rfc5365.txt 41KB rfc3312.txt 66KB rfc5393.txt 49KB rfc5363.txt 23KB rfc4916.txt 43KB rfc5366.txt 28KB rfc4662.txt 83KB rfc3485.txt 80KB rfc3261.txt 648KB rfc4538.txt 36KB rfc3486.txt 24KB rfc5049.txt 48KB rfc5688.txt 15KB rfc5263.txt 33KB rfc5079.txt 16KB rfc5629.txt 93KB rfc4145.txt 30KB rfc3605.txt 17KB rfc5658.txt 39KB rfc5630.txt 115KB rfc5478.txt 13KB rfc3311.txt 28KB rfc4730.txt 120KB rfc4508.txt 11KB rfc5196.txt 59KB rfc4483.txt 37KB rfc5373.txt 60KB rfc4780.txt 161KB rfc5368.txt 29KB rfc5370.txt 23KB rfc5621.txt 44KB rfc5367.txt 18KB rfc5509.txt 10KB rfc5627.txt 95KB rfc5360.txt 71KB rfc5626.txt 116KB rfc5552.txt 85KB rfc4474.txt 105KB资源评论
