[cisco-voip] Unity External Transcoding

[Ryan Ratliff]

CallManager only as in software MTP?  That isn't a transcoder it's a  
g.711 only MTP.

-Ryan

On Mar 28, 2006, at 1:31 PM, Pritchard, Jon wrote:

The MTP resource is CallManager only at this point and it's in the  
MRG/MRGL for all devices.

Jon

-----Original Message-----
From: Voll, Scott [mailto:Scott.Voll at wesd.org]
Sent: Tuesday, March 28, 2006 8:38 AM
To: Pritchard, Jon; cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Unity External Transcoding

Have you double checked the GW includes the Media Resource group that  
has the MTP in it?

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip- 
bounces at puck.nether.net] On Behalf Of Pritchard, Jon
Sent: Tuesday, March 28, 2006 7:49 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Unity External Transcoding

I'm attempting to enable Unity external transcoding for g729  
connections to offload CPU and improve voice quality.  I have a PVDM2  
based DSPFarm with 80 transcoder sessions.  I have successfully  
disabled native transcoding on Unity and have verified external  
transcoding is in play when calling Unity internally (VM or AA) from  
a Region set for g729 relative to the Region Unity is in.   However,  
when external calls are routed to Unity from the g729 regions I get  
disconnected with what "sounds" like a codec mismatch.

I compared the CCM traces (detailed/debug) of the successful internal  
calls vs. the failed external calls.  The successful calls showed the  
MediaResourceManager negotiating the transcoder connection and  
minimal MediaTerminatePointControl activity.  The unsuccessful calls  
didn't show a specific error but does show trying to push a G711ulaw  
payload during the MediaTerminationPointControl phase and no  
interaction with the MediaResourceManager to set up transcoding.

The gateways involved are 1760 H323 on 12.3(8)T4 and have both G711  
and G729 codecs enabled via codec class in the dial-peers, pref 1  
G711 and pref 2. G729.

The really weird part is the external connections have been and still  
are successful when Unity is running native transcoding with the rest  
of the configuration is the same.

Is it possible I'm missing something relative to MTP requirements?   
MTP resource is currently limited CallManagers and is within scope of  
the MRGL for all devices, VM ports and gateways included.

Any insight you might have would be appreciated.

Thx,
Jon Pritchard




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