[cisco-voip] CUCM 7 to UCM4 Call Failure

[Ryan Ratliff]

Sounds like the media exchange timer is expiring, thus dropping the  
call.  This timer has a default value of 12 seconds.   You'll need to  
enable h.245 debugs on the CUCMs on both side of the call and look at  
traces to see what is going on.

http://www.td.rutgers.edu/documentation/FAQ/H.323_Tutorial/#signaling  
seems to be a decent overview of what to look for on both the H.225  
and H.245 sides.

-Ryan

On Aug 1, 2009, at 10:59 AM, wazab wrote:

Hi,

I have been having a strange problem since I configured CUCM7. I have  
CUCM7.0 running on VMware for lab testing. I also have a production  
CUCM 4.3.2 running serving customers. Both servers are now making  
calls via H.225 trunks (gatekeeper controlled). There is no  
intercluster trunks or any trunks between the two servers.

UCM7 is able to make and received calls without a problem even from  
UCM4.3. The issue is that UCM7 is unable to call IP phones registered  
with UCM4. My test is calling a DID number that should ring a UCM4 IP  
phone. What happens is as follows:

UCM7 Phone (A) calls UCM4 Phone (B)
Phone B rings and phone A hears a ringback tone
Phone B picks up
Both phones hears silence for 11 seconds
Reorder tone is heard in both phones

I have made sure that the region settings codec are set to g711 on  
UCM7. What can be the cause of the problem? Also how can I debug  
using RTRM?

Thanks

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