I've got a Cisco2821 used as CUBE connected via h323 to CallManager 4.2 and on the other hand connected via SIP to Microsoft Mediation Server.
When I call from OCS to a CiscoPhone, sometimes there is no voice and when there is voice, it is not possible to take the call on hold at the OCS Client, it just mutes the microphone.
When there is no voice, the call is disconnected after some seconds
When there is voice, there are SIP messages, but no h225 messages on the CUBE.
Attached you find a output of debug h225 q931 and a show call active media compact and the relevant configuration.
What I'm wondering, from where comes the g729r8 codec in the show call active media output, as there is nowhere g729 enabled.