I am trying to provision Polycom phones, IP 501, IP 300, IP 550 and IP 650 with no luck. IP 550 is receiving all details via web GUI but when go to make a call it displays "URL Calling is disabled". Anybody got any ideas? I am using Incredible PBX 12.0.70 Asterisk 13.9.1 I have the PBX on a virtual server at ImpactVPS. Any help greatly appreciated.