RFC 3263 (rfc3263) - Page 1 of 17

Session Initiation Protocol (SIP): Locating SIP Servers

Alternative Format: Original Text Document
Next >
Network Working Group                                       J. Rosenberg
Request for Comments: 3263                                   dynamicsoft
Obsoletes: 2543                                           H. Schulzrinne
Category: Standards Track                                    Columbia U.
                                                               June 2002


        Session Initiation Protocol (SIP): Locating SIP Servers

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

   The Session Initiation Protocol (SIP) uses DNS procedures to allow a
   client to resolve a SIP Uniform Resource Identifier (URI) into the IP
   address, port, and transport protocol of the next hop to contact.  It
   also uses DNS to allow a server to send a response to a backup client
   if the primary client has failed.  This document describes those DNS
   procedures in detail.

Table of Contents

   1          Introduction ........................................    2
   2          Problems DNS is Needed to Solve .....................    2
   3          Terminology .........................................    5
   4          Client Usage ........................................    5
   4.1        Selecting a Transport Protocol ......................    6
   4.2        Determining Port and IP Address .....................    8
   4.3        Details of RFC 2782 Process .........................    9
   4.4        Consideration for Stateless Proxies .................   10
   5          Server Usage ........................................   11
   6          Constructing SIP URIs ...............................   12
   7          Security Considerations .............................   12
   8          The Transport Determination Application .............   13
   9          IANA Considerations .................................   14
   10         Acknowledgements ....................................   14
   11         Normative References ................................   15
   12         Informative References ..............................   15



Rosenberg & Schulzrinne     Standards Track
Next >