We need to use G.729 for users checking voicemail with Unity Connection. See attached diagram, which should make the scenario more clear. The CUBE config only allows for explicit config of G.729a or G.729ab, but not G.729:
codec preference 1 g729br8 bytes 30
codec preference 2 g729r8 bytes 30
While Unity Connection is only using G.729 (not G.729a or G.729ab), as specified in the Unity Connection Design Guide:
Supported Line Codecs (Advertised Codecs)
· G.711 mu-law
· G.711 a-law
What will happen when users call in remotely to check their messages if the CUBE cannot negotiate G.729 with Unity Connection?