Has anyone had troubles getting the SIP trunk to work properly between these two systems? The trunk seems to work, but the RTP stream is avoiding the Avaya Session Manager completely. From what i can tell, the SIP packet is getting changed on the user agent and marking the destionation as the CUCM rather than the Session Manager. So the RTP stream goes from the end device on Avaya to the CUCM. Basically, we are trying to trunk the call between the PBXs so RTP flows from one system to the next... not around the Session Manager.
CUCM----SIP trunk-----Session Manager-------SIP trunk------Exchange UM.
When a call rolls from CUCM to Exchange UM, the signalling goes through, but the RTP stream goes from Exchange UM/CUCM.
I have MTP setup on the CUCM trunk SIP to Session Manager, but the RTP stream still goes around Session Manager.
Im guessing its an Avaya problem, that they are manipulating the SIP header to make the RTP packet go back to CUCM and not through their system for some reason.
Fun stuff right?!