I setup firewall rules and the like on my end. (Even switched to a DMZ host). When I make or recieve a call it starts. I get audio/video for 10-30 seconds then drops.
Using FaceTime http://support.apple.com/kb/ht4319
Troubleshooting FaceTime http://support.apple.com/kb/TS3367
The Complete Guide to FaceTime: Set-up, Use, and Troubleshooting Problems
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