Hi again, I've followed the instructions for getting my Skype Connect VoIP trunk set-up in 3cx phone system. The extension seems properly registered (green light), but when I attempt to make a call that would use the trunk, the calls fail (from a SIP phone as well as from 3cx phone for windows). A look at the server log reveals error 403: forbidden on the invite from the sip.Skype.com IP address. I've made doubly sure that my credentials are correct, even having my Skype connect SIP profile password reset several times. Any clues as to what might be amiss? The instructions are so straightforward... 3cx phone system 12. Thanks for the help.