I've recently configured integration between CCM v5.1.2 and Unity Express v7.0 and some features worked properly and I'm able to record calls from Cisco Phones and Cisco IP Communicators. But when outside calls (external and internal, from our Ericsson PBX system) are received, they're not correctly forwarded to the voicemail system provided by Unity Express.
Unity Express module is AIM-CUE= and is installed on a C2851 router, that's integrated with our Ericsson PBX system. External (and internal, not used by CCM v5) calls are forwarded from Ericsson to CCM normally but not forwarded properly when they're trying to reach the Unity Express. When I make a call from cell phone, it rings until I receive a "BUSY" signal from the PBX system, indicating some sort of error, maybe from misconfiguration of Unity Express or CCM or both.
Please, can you help me?
It seem to be a codec problem
CUE accept only G711
So you'll need a transcoder for the external calls to work and add "codec G711" under your CUE dial-peer ,also add allow connections under voice service voip
Wish this be helpful