[cisco-voip] Unity External Transcoding

[Ryan Ratliff]

Was your goal to get Unity using only g.711 or both g.711 and g.729?

-Ryan

On Mar 28, 2006, at 2:16 PM, Pritchard, Jon wrote:

You might be on to something.  Unity VM ports and the transcoder are in
the same device pool/region.  However, one of the tests was to force the
in-region codec to G729 so that even connections from local phones in
the same device pool/region (i.e. host site phones) so everything was
G729.  I'm 99% sure this worked.

I'll recheck/retest after hours tonight.

Jon

-----Original Message-----
From: Ryan Ratliff [mailto:rratliff at cisco.com]
Sent: Tuesday, March 28, 2006 11:10 AM
To: Pritchard, Jon
Cc: Voll, Scott; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Unity External Transcoding

  From your description I don't see why an MTP would be required at all.

If you have disabled g.729 on your Unity ports then for a call
between Unity and a g.729 region Unity should talk g.711 to the
transcoder and the transcoder should talk g.729 to the other
endpoint.   I'd check the region config between your voicemail ports
and the transcoder.  If that is set to g.729 then the call will fail.

-Ryan

On Mar 28, 2006, at 1:55 PM, Pritchard, Jon wrote:

MTP in general isn't required.  It's for things like non-Cisco devices
(i.e. H323 phones) which don't have the ability to terminate the RTP
stream themselves.

The big question is why is MTP coming into play here (there's nothing
I've found on CCO to support this requirement).

Even if MTP is required here why is the MediaControlPoint looking for
resource on the GW that isn't defined let alone in any MRG/MRGL.

All I can think to do is to reconfigure the DSP farm for MTP, add it to
CCM and the MRG/MRGL's and see what, if any, difference it makes.

Jon

-----Original Message-----
From: Ryan Ratliff [mailto:rratliff at cisco.com]
Sent: Tuesday, March 28, 2006 10:44 AM
To: Pritchard, Jon
Cc: Voll, Scott; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Unity External Transcoding

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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