MOC 2007 client 1 receives call from MOC client 2. External call comes in from CUPS to MOC client 1 and rolls to MOC client 3 (receptionist) who answers. MOC client 3 transfers external call back to MOC client 1. At MOC client 1 call from MOC client 2 is automatically placed on hold and external call is picked up by MOC client 1. This is undesired behavior. Review of SIP trace from OCS and CUPS shows behaviour but see nothing that points to why this is happening and how to correct.