[cisco-voip] Switch replacement causes one-way audio?

[Wes Sisk]

Heuristically you can look for problems on the switch.  You may be able 
to check counters on the switch to find next step.  common failures are 
in arp related activity.  phone may be of some use as well.  in an 
active call press the i or ? button twice to see call statistics. this 
shows packets Tx and Rx.  If packets are not transmitting, you need to 
look at SCCP or SIP signaling with CUCM.  If packets are not receiving 
you likely have a network problem between the endpoints, refer to ARP 
comment above.  The CUCM CDR database or CAR tool can be helpful.  look 
for lost, dropped, or out of order packets.   or look for low packet 
counts.  another approach is:
http://puck.nether.net/pipermail/cisco-voip/2008-July/035519.html

the same calculation can be used based on SCCP messages 
OpenReceiveChannelAck, StartMediaTransmission, and ConnectionStatisticsRes



Algorithmically you can get a packet capture of the problem.  That will 
show exactly what failed and point to proper next step.

/Wes

On Wednesday, February 11, 2009 7:09:19 PM, Biffle, Gerrad 
<Gerrad.Biffle at greensboro-nc.gov> wrote:
>
> This past weekend our network team replaced some aging 4006s with 3750 
> stacks.  Since then we've had users complaining that callers on the 
> far end cannot hear them.  Our first thought was to hard code the 
> switch-port to 100/full (we're using 7960Gs) -- and that didn't seem 
> to help.
>
> Does anyone have any ideas on what we could check before opening a TAC 
> case tomorrow? 
>
> Thanks.
>
>
>
>
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