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SIP: Session Initiation Protocol (RFC2543)

IP.com Disclosure Number: IPCOM000003129D
Original Publication Date: 1999-Mar-01
Included in the Prior Art Database: 2000-Sep-13

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Handley: AUTHOR [+4]

Abstract

The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating, modifying and terminating sessions with one or more participants. These sessions include Internet multimedia conferences, Internet telephone calls and multimedia distribution. Members in a session can communicate via multicast or via a mesh of unicast relations, or a combination of these.

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Network Working Group M. Handley

Request for Comments: 2543 ACIRI

Category: Standards Track H. Schulzrinne

Columbia U.

E. Schooler

Cal Tech

J. Rosenberg

Bell Labs

March 1999

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 (1999). All Rights Reserved.

IESG Note

The IESG intends to charter, in the near future, one or more working

groups to produce standards for "name lookup", where such names would

include electronic mail addresses and telephone numbers, and the

result of such a lookup would be a list of attributes and

characteristics of the user or terminal associated with the name.

Groups which are in need of a "name lookup" protocol should follow

the development of these new working groups rather than using SIP for

this function. In addition it is anticipated that SIP will migrate

towards using such protocols, and SIP implementors are advised to

monitor these efforts.

Abstract

The Session Initiation Protocol (SIP) is an application-layer control

(signaling) protocol for creating, modifying and terminating sessions

with one or more participants. These sessions include Internet

multimedia conferences, Internet telephone calls and multimedia

distribution. Members in a session can communicate via multicast or

via a mesh of unicast relations, or a combination of these.

SIP invitations used to create sessions carry session descriptions

which allow participants to agree on a set of compatible media types.

SIP supports user mobility by proxying and redirecting requests to

the user's current location. Users can register their current

location. SIP is not tied to any particular conference control

protocol. SIP is designed to be independent of the lower-layer

transport protocol and can be extended with additional capabilities.

Table of Contents

1 Introduction ........................................ 7

1.1 Overview of SIP Functionality ....................... 7

1.2 Terminology ......................................... 8

1.3 Definitions ............................................