We are in the process of deploying OCS and purchased some usb phones to test. We were under the impression that we could get the presense icon to work as well as having the ability to hang up the handset which would then end the call. I found that If I Enable users for enterprise voice, the presense on the phone begins to work and we get dial tones but when you attempt communicator calls, you get fast busy signals. Is there a way to use this phone, getting the presense and other bells and whistles while only enabled for pc-pc communication or is there away to get the communicator calls to work after users are enabled for Enterprise voice?