CUCM call recording

To enable call recording in CUCM,

1) Enable Built-in-bridge on the phone setting.
2) Enable Call monitoring on the DN. There are two configuration, one is "Recording Option", the other is "Recording Profile".

When you set "Recording option" to "Automatic Call Recording Enabled", when the RTP stream is estabilished, the codec will be locked which will cause some issues.

Let's look at a sample, agent A and B are on the same location. User from remote branched call agent A and this is a G729 call. Then agent A transferred the call to agent B using consultative transfer which will create a G722 RTP. Note that right now agent B is locked to G722. But based on the region setting, it should use G729 between the user and agent B. So when agent A hit transfer again, the call will be disconnected.

Here is the solution:
1. Disable G722 option for call recording DNs.
2. Setup Transcoder per branch which will have call recording enabled.