Thanks Alan. Maybe Session-Timer like mechanism can help alleviate the
"dangling stream" problem?

Most UAs today indicate "I am putting you on hold" by sending 0.0.0.0 in the
SDP and implement neither a B2BUA or REFER - so, it is impossible to
uniformly offer a MOH service. 

thanks,
Sunil Veluvali
Sylantro Systems

-----Original Message-----
From: Alan Johnston [mailto:[EMAIL PROTECTED]]
Sent: Thursday, April 25, 2002 5:49 AM
To: SIP Mailing List
Subject: RE: [Sip-implementors] Music-On-Hold ?


Hi Sunil,

I belive it is the only flow published for music on hold.  However, as
the document states, it is not the only way it can be done.  Previous
versions of the document have shown using a REFER to a Music On Hold
server, in which case B can crash.

In the current flow which uses B as a 3pcc, if B dies, A will just hear
music until either they give up or the Music Server times out and stops
streaming music.

Thanks,
Alan Johnston
WorldCom
sip:[EMAIL PROTECTED]

> -----Original Message-----
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED]] On Behalf Of 
> Sunil Veluvali
> Sent: Wednesday, April 24, 2002 7:19 AM
> To: '[EMAIL PROTECTED]'
> Subject: [Sip-implementors] Music-On-Hold ?
> 
> 
> Hi: Is 
> http://search.ietf.org/internet-drafts/draft-ietf-sipping-serv
> ice-examples-0
> 0.txt the only I-D that discusses implementation of Music On Hold? 
> 
> With this I-D, has there been any thought put into what 
> happens when A is in a session with B, B instructs a "music 
> server" to stream to A and then B dies - Since B is acting as 
> a B2BUA, who cleans up the session between B and the "music server"?
> 
> thanks!
> ========================================
> Sunil Veluvali
> mailto:[EMAIL PROTECTED]
> sip:[EMAIL PROTECTED]
> tel:+1-408-626-2309
> http://www.sylantro.com ========================================
> 
> _______________________________________________
> Sip-implementors mailing list
> [EMAIL PROTECTED] 
> http://lists.cs.columbia.edu/mailman/listinfo/> sip-implementors
> 


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