I have a small CUCM 6 setup that has one CUCM server. My CUCM server routes calls to a CME 4.1(0) router via h323 gateway configuration.
I can make calls between locations without any issues.
However when calls from the CME phones are placed on hold on by the CUCM phones, the CME phones get a busy signal and the call drops.
This is also affecting call transfers of the CME calls between the CUCM phones.
On the CME phones I can hold and transfer the CUCM calls without any issues.
Has anyone any ideas how to solve this issue?