[cisco-voip] Transcoder Issue

[Wes Sisk]

Inline, ws.

On Friday, August 13, 2010 10:53:10 AM, H, Tim <TimH at trstone.com> wrote:
>
> I'm working on an issue that is puzzling me.  Have you ever heard of 
> Transcoders that will just not work? 
>
ws: does transcoder not get invoked?(cm problem)
do they need to be invoked?(cm automatically provides g729 MoH streams 
and may deallocate xcoder mid call after 8.x 
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/rel_notes/8_0_1/delta/8_0_3.html#wp82302)
>
> I have setup inter-cluster trunks that go between call centers that 
> serve as overflow for call centers.  Codec between call centers is 
> G.729.  All UCCX machines are setup for G.711.  After one of my 
> locations overflows to the other, they can hear prompts on the UCCX 
> machine
>
ws: this 'generally' means xcoder invoked correctly.  CM service 
parameters can be set so a call is attempted to be connected even if 
media resource invocation occurs.  this usually disables supplementary 
services though (no ability to place call on hold).
>
> but not MOH when the call is queued.
>
ws: now it's a bit interesting.  media flows from UCCX through xcoder 
properly.  when connected to MoH is xcoder still required? is MoH 
enabled to stream g.729?  If so, does the CM hosting the MoH service 
have properly ip routing (connectivity) to device in the other center?  
If xcoder is invoked then media may NOT flow from MoH server to xcoder 
properly. In this case it would depend if you are using unicast or 
multicast (I don't think xcoders handle multicast moh).  Does the CM 
hosting the MoH server have ip connectivity to the xcoder?  At the same 
time, what IP interface on the router is the transcoder bound to?  It 
could be bound to an IP interface that is not advertised in routing 
protocols so all devices don't know how to reach the transcoder IP address.

/wes
>
>   I've triple checked my configs with the transcoders and I never see 
> any calls being transcoded on my voicegateway.  I have the exact same 
> setup at another site with no issues.
>
>  
>
> Any ideas?
>
>  
>
> Thanks,
>
>  
>
> *Tim *//
>
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>
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