[cisco-voip] no audio for 10 seconds

[Wes Sisk]

Hi Erick,

Based on history you're a pretty enterprising.  Any insight on what you've checked so far?

Is it only reported on 9971's? Is there any other consistency in the reports thus far? 

One of my favorite approaches to get a bit of insight on this type of issue is CMR data.  Look at CMR's for "simple" calls - direct call, connection, duration hangup; no mute/transfer/hold/park/etc.  If you're using fixed packet rate audio codec (not ilbc) then the packets sent/received should be linearly proportional to call duration barring a few special situations.

Assuming 20packets per second are the number of packets received appropriate for the duration of the call?  

If the packet counts are correct then it's an audio cut through issue on the gateway or audio rendering issue inside the phone.
gateway concerns: call going into connected state, any progress indicators exchanged (affect audio cut through timing)

If the packet counts are off then there is a network issue.

/wes

On Nov 2, 2011, at 11:46 AM, Wellnitz, Erick A. wrote:

All, especially you really smart guys at Cisco…
 
We’re at a loss for where to continue looking for a potential cause on a very intermittent issue.
 
Mixed 9971 and 7975 environment with shared lines.  Inbound calls come into our old (and temporary) Siemens PBX.  Cross a QSIG trunk group to Cisco 3945 with PVDM3-192
 
Caller on our Cisco side places a call.  They hear ringback.  Call connects without audio for about 10 seconds.
 
We couldn’t find anything similar to this in bug toolkit. 
 
9971 firmware: 9-2-1
CUCM Ver: 8.0.3.21900
 
SR 619601919
 
We have a  laundry list of issues with the 9971 model but this is currently the most urgent.
 
 
ERICK A. WELLNITZ 
Network Engineer
Katten Muchin Rosenman LLP
525 W. Monroe Street / Chicago, IL 60661-3693
p / (312) 577-8041 
erick.wellnitz at kattenlaw.com / www.kattenlaw.com
 
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