Dale,

A couple of comments.

Care has to be taken using an SDP answer as an SDP offer. Whilst it
might be acceptable to copy some parts, copying the whole SDP is wrong
because of certain SDP features that are not symmetrical. One example is
MIKEY, where a MIKEY request in an offer has completely different syntax
and semantics from MIKEY in an answer. Another example is the capability
negotiation draft in MMUSIC.

Another concern is how would ICE work? The held UA never receives
candidate IP addresses and ports for the MoH server.

John

> -----Original Message-----
> From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org] 
> Sent: 08 November 2007 04:10
> To: i-d-announce@ietf.org
> Subject: I-D Action:draft-worley-service-example-00.txt
> 
> A New Internet-Draft is available from the on-line 
> Internet-Drafts directories.
> 
> 	Title           : Session Initiation Protocol Service 
> Example -- Music on Hold
> 	Author(s)       : D. Worley
> 	Filename        : draft-worley-service-example-00.txt
> 	Pages           : 26
> 	Date            : 2007-11-07
> 
> The "music on hold" feature is one of the most desired features of
> telephone systems in the business environment.  "Music on hold" is,
> 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 standards-compliant, but is simpler than the
> methods previously documented.
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-worley-service-examp
> le-00.txt
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