I am testing IP communicator v2.0 with call manager v4.0(2a)sr2c. Most of the ipt communicator functions and voice quality are working well in the office LAN. Except, there is no MOH when remote calling party puts (ipt phone model 7940)the call to MOH. At IPT communicator, I hear intermittent short beep sound instead of normal moh music wave sound. There is moh when ipt communicator ext put the called party on hold. Did I miss some configuration in call manager? Do I need to activate multicast feature in media resource group? I need some coaching to resolve the issue. Thanks in advance.