I can see the phone I want to provision listed in the phones list and assign it to an extension. Once this is done the phone then appears to register as I can see the extension and user name displayed on the handset. However the top line is showing "not registered: 660" and the phones list still shows the phone as if it were un-provisioned. Although I can dial and log into voicemail from the phone and it shows the directory, however if I try to make any other calls I get an engaged tone. I can't use DHCP option 66 as I already have another service using this. Any ideas what I'm doing wrong or what's up? Cheers.