Its a cisco voice router so it includes methods for translating sip messages 
and sdp. Its internal moh capabilities probably are not important as we don't 
use Call Manager and they are designed to work with that device. 

What i have been trying to understand is just how the polycoms and sipxecs 
proxy are handling this scenario on the lan. From my traces: 

Phone A makes a Call to Phone B 
Phone B Places A on Hold 
Phone B (in a new call-id) Invites [email protected] a=recvonly 
Phone B sends Reinvite to A with no sdp information 
Phone A Replys with sdp a=recvonly and gets stream from B acting as a 3pcc 
When Phone B wants to get back to the call it sends Reinvite with sdp info 

Is this correct ? 







Gabrial Casey 
Telecommunications 
Franklin American Mortgage Company 
501 Corporate Center Dr. 
Suite 400 
Franklin, TN 37067 
Direct:615-468- 2945 
Cell: 615-852-5015 
Fax: 615-628-5698 
Email:[email protected] 


----- Original Message -----
From: "Tony Graziano" <[email protected]> 
To: "Discussion list for users of sipXecs software" 
<[email protected]> 
Sent: Saturday, January 8, 2011 10:01:46 AM 
Subject: Re: [sipx-users] Music on Hold Sans Sipx-Bridge 



On Sat, Jan 8, 2011 at 10:25 AM, Gabe Casey < [email protected] > 
wrote: 




I have a question concerning the installation of a cisco UBE. This SBC is 
required for an installation. 

Typically Music on hold scenarios are handled via the sipx-bridge. I see that 
the polycom phones use an sdp event to trigger the invite to the url 
[email protected] 
Can anyone explain this process and what i might do to pass this through the 
extenal sbc. 

The Unified Boarder Element is technically designed to sit in front of a CCM 
which will supply the unicast or multicast audio. 
My traces from the cisco do show the sdp event= send only which seems to 
trigger an on hold scenario however im not sure how the entire process actually 
works in a sip gateway 


The environment: 
4.2 from iso 
Polycom 450/650 

Warm Regards 





Gabrial Casey 
Telecommunications 
Franklin American Mortgage Company 
501 Corporate Center Dr. 
Suite 400 
Franklin, TN 37067 
Direct:615-468- 2945 
Cell: 615-852-5015 
Fax: 615-628-5698 
Email:[email protected] 




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The SBC's we work with support a MOH uri which handles that (and ignores the 
polycom moh). 


SBC says: Support old type (0.0.0.0.), which is silence. Support MOH URI, where 
we input the default sipx MOH uri the polycom phones use. 


Sipxbridge does its own MOH, which is not customizable. 


The question is, what does the SBC support as far as MOH, because you have not 
indicated that yet. 


/t 

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