I have a CME / CUE setup on a 3845 with 12.4(4)XC6 IOS and after 3 or 4 days, calls disconnect right away when they roll to VM on the CUE.
Reloading the CUE does not fix it, but a router reboot does it fix for a few days then after 3 or 4 days the same problem comes back.
Looking at ccsip debugs, I am seeing a cancel message come back after some attempts.
On the call that disconnect, they disconnect right away, sometimes you hear a blip of a ringback but most of time you don't even hear a ring before it disconnects.
Here is the output from show call history, it has a interworking error. There is transcoding also happening since the calls are g729 and need to be transcoded to go to CUE.
long duration call detected:n long dur callduration :n/a timestamp:n/a3EA4 : 26
73 180258030ms.2465 +-1 +120 pid:1000 Answer 8475551234
dur 00:00:00 tx:0/0 rx:0/0 7F (interworking (127))
IP 0.0.0.0:0 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g729r8 pre-iet
f TextRelay: off
Attached is a ccsip debug.