I have a strange issue with our COS/CUPS integration. RCC and Presence integration work fine. The problem is RCC enabled users on OCS receive missed calls from themselves every 30 minutes. If you are at the desk you will see the phone light up and a call from 'User A' to 'User A'. If you answer the call it hangs up immediatley. If you don't answer the call It goes to VM and hangs up when Unity answers. The same behavior occurs when 'User A' signs into Office Communicator.
The Real Time Trace Logs from RTMT and the OCS Trace logs don't show anything unusal but I can see the SIP Conversation taking place on sign in that sends the SIP INVITE incoming from CUPS.
Is there a 'Presence Timer' that is genereating this call? We have almost the exact same setup in the lab but can not duplicate the behavior.
Any suggestions are appreciated I am stumped.