[cisco-voip] CUCM 7 to UCM4 Call Failure

[wazab]

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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