Session Initiation Protocol Service Example -- Music on Hold
draft-worley-service-example-11

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Dispatch                                                     D.R. Worley
Internet-Draft                                                   Ariadne
Intended status: Informational                         February 18, 2013
Expires: August 22, 2013

      Session Initiation Protocol Service Example -- Music on Hold
                    draft-worley-service-example-11

Abstract

   The "music on hold" feature is one of the most desired features of
   telephone systems in the business environment.  "Music on hold" is
   where, when one party to a call has the call "on hold", that party's
   telephone provides an audio stream (often music) to be heard by the
   other party.  Architectural features of SIP make it difficult to
   implement music-on-hold in a way that is fully compliant with the
   standards.  The implementation of music-on-hold described in this
   document is fully effective and standards-compliant, and has a number
   of advantages over the methods previously documented.  In particular,
   it is less likely to produce peculiar user interface effects and more
   likely to work in systems which perform authentication than the
   method of RFC 5359.

Status of This Memo

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   This Internet-Draft will expire on August 22, 2013.

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   Copyright (c) 2013 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Worley                  Expires August 22, 2013                 [Page 1]
Internet-Draft               Music on Hold                 February 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Intended Status . . . . . . . . . . . . . . . . . . . . .   3
   2.  Technique . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Placing a Call on Hold and Establishing an External Media
           Stream  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Taking a Call off Hold and Terminating the External Media
           Stream  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Example Message Flow  . . . . . . . . . . . . . . . . . .   5
     2.4.  Re-INVITE and UPDATE from the Remote UA . . . . . . . . .  14
     2.5.  INVITE with Replaces  . . . . . . . . . . . . . . . . . .  15
     2.6.  Re-INVITE and UPDATE from the Music-On-Hold Source  . . .  15
     2.7.  Handling Payload Type Numbers . . . . . . . . . . . . . .  16
       2.7.1.  Analysis  . . . . . . . . . . . . . . . . . . . . . .  16
       2.7.2.  Solution to the Problem . . . . . . . . . . . . . . .  16
       2.7.3.  Example of the Solution . . . . . . . . . . . . . . .  18
     2.8.  Dialog/Session Timers . . . . . . . . . . . . . . . . . .  21
     2.9.  When the Media Stream Directionality is "inactive"  . . .  21
     2.10. Multiple Media Streams  . . . . . . . . . . . . . . . . .  22
   3.  Advantages  . . . . . . . . . . . . . . . . . . . . . . . . .  22
   4.  Caveats . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
     4.1.  Offering All Available Media Formats  . . . . . . . . . .  23
     4.2.  Handling re-INVITES in a B2BUA  . . . . . . . . . . . . .  24
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  24
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  25
   7.  Revision History  . . . . . . . . . . . . . . . . . . . . . .  25
     7.1.  Changes from draft-worley-service-example-00 to draft-
           worley-service-example-01 . . . . . . . . . . . . . . . .  25
     7.2.  Changes from draft-worley-service-example-01 to draft-
           worley-service-example-02 . . . . . . . . . . . . . . . .  26
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