	SIP Reference Guide
Table Of Contents
DNS Example
Elements and Architectures
Header Fields
Header Fields – Compact Forms
Header Parameters & Values
INVITE Client Transaction
INVITE Server Transaction
INVITE/200
Mapping Between SS7 USI and the SIP SDP (SS7 Origination)
Mapping Between the SIP SDP and SS7 USI/HLC (SIP Origination)
Mapping ISUP Cause Codes to SIP-I/SIP-T Responses
Mapping SIP-T Responses to ISUP Cause Codes
Mechanics: Location
Mechanics: Registration
Namespaces and Priority Values for the Resource Priority Header Field
NAPTR Records
Non-INVITE Client Transaction
Non-INVITE Server Transaction
Option Tags for SIP Extensions
Response Code
Security Mechanism Names
Session Description Protocol
SIP Events
SIP Methods
SIP Response to a Call Progress (CPG) Message
SIP Timers
SIP/SIPS URI Parameters
SIP-I Responses - ISUP Cause Codes
SIPS's Use of DNS
SRV Records
Types of DNS Resource Records
URI Purposes
Warning Codes
Glossary of SIP Acronyms
SIP References

SIP Methods

Other SIP Resources

	SIP Pocket Guide
	SIP Signaling Router Use Cases Multimedia
	SIP Sessions Blog
	SIP Signaling Router Application Handbook
	SIP Signaling Router (SSR) Use Cases Application Guide

Methods	Description	RFC
ACK	Acknowledgment sent in response to a 3261 response to an INVITE request	RFC 3261
BYE	Terminates a Session	RFC 3261
CANCEL	Cancels a pending transaction	RFC 3261
INFO	Carries session-related control information	RFC 2976
INVITE	Establishes a session between participants	RFC 3261
MESSAGE	Transfers instant messages	RFC 3428
NOTIFY	Informas a subscriber about the state of a resource	RFC 3265
OPTIONS	Queries a server about its capabilities	RFC 3261
PRACK	Similar to ACK but for responding to reliable provisional responses	RFC 3261
PUBLISH	Publishes event state to a SIP events server	RFC 3903
REFER	Indicates that the recipient should contact a third party using contact information provided in the request	RFC 3515
REGISTER	Registers contact information	RFC 3261
SUBSCRIBE	Requests current state and state updates from a remote node	RFC 3265
UPDATE	Updates parameters of a session	RFC 3311

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