I have a remote user with a Cisco 7945G phone connecting to UCM 7.1 via a Cisco ASA 5510. What he is seeing sometimes is he gets on a call with one person on line 1. The phone has just one number on it. Sometimes when a second call comes in - the first call is put on hold and then the new incoming call gets dropped when he hits the Answer button. Any thought on what this issue could be? Or how to go about troubleshooting? Thanks.