We enable the automatic recording for some phones. After that, we have problems related to conference, transfer. We are using CUCM 6.1.
After some troubleshooting, it looks like when the phone is under recording, the codec is locked.
Let's say Phone B is record-enabled.Phone A and B are in the same region, Phone C in another region. All phones call talk to each other no problem.
But it fails in the following transfer case. Phone A calls B using codec G.711, later Phone A presses transfer and talk to Phone C using Codec G.729. As soon as Phone A hit the transfer button again, the call is disconnected and both B and C hear fast busy tone. That's because Phone B is locked to G711 even though it dose support G729 natively and we don't have transcoder setup between these two region.
My question is why the codec is locked? Is it a bug for this specific version? From the cisco document, it says that call recording won't survive hold(http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/6_1_1/ccmfeat/fsmr.html#wp1058289). If that's true, the transfer should work. In my case, when Phone B is on hold, I did not see the recording get torn down and the moh was recorded.