[cisco-voip] Phones displaying CM Down during calls.

[Matt OLIVER]

Hi there, 
I have a number of phones  (20 out of 192 in one VLAN) that are coming
up with CM Down during calls. I know that this is caused through the
phone being unable to talk to the call manager via skinny, however we
are having no phones rehome to other Call Managers, and in the
particular building we have 600+ users and this is only affecting 20
users all of whom are in the same VLAN.
The VLAN configs are all the same and deployed in the same manner across
8500 phones. There are 4x 3560-48 switches in the affected VLAN. 
These connect via GBIC uplink ports to redundant 6509 core switches.
 
We are seeing no errors on the WAN, or interfaces, in fact the only
please the error is seen is on the phones themselves, and it is
intermittent. The IOS version is 12.2(25)sec which again has been
deployed on over 400 of these in the network.
It seems link only skinny is affected, the users are not complaining of
data errors and the calls are not being cut off, although the caller is
reporting hearing a loud noise when it happens.
 
I have seen a few other threads that mention a similar error, however I
cant seem to find any answers on this.   Any ideas would be greatly
appreciated.
 
 
Regards Matt
 
 
 


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