[cisco-voip] no audio for 10 seconds

Wes Sisk wsisk at cisco.com
Wed Nov 2 12:07:57 EDT 2011


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
 
===========================================================
CIRCULAR 230 DISCLOSURE: Pursuant to Regulations Governing Practice Before the Internal Revenue
Service, any tax advice contained herein is not intended or written to be used and cannot be used
by a taxpayer for the purpose of avoiding tax penalties that may be imposed on the taxpayer.
===========================================================
CONFIDENTIALITY NOTICE:
This electronic mail message and any attached files contain information intended for the exclusive
use of the individual or entity to whom it is addressed and may contain information that is
proprietary, privileged, confidential and/or exempt from disclosure under applicable law.  If you
are not the intended recipient, you are hereby notified that any viewing, copying, disclosure or 
distribution of this information may be subject to legal restriction or sanction.  Please notify
the sender, by electronic mail or telephone, of any unintended recipients and delete the original 
message without making any copies.
===========================================================
NOTIFICATION:  Katten Muchin Rosenman LLP is an Illinois limited liability partnership that has
elected to be governed by the Illinois Uniform Partnership Act (1997).
===========================================================
_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20111102/17c36dd0/attachment.html>


More information about the cisco-voip mailing list