I've had a 3CX system up and running for two years now without too many hitches. However all of a sudden our remote extensions can't make direct outgoing calls to other extensions or to an outside line. We've tried our iPhone app and our Cisco SPA phone and both are returned a "Forbidden" message. We CAN use 3CXMyphone to initiate calls for the extensions so we can work around this for awhile but its not very elegant. I've checked the extension settings and remote extensions should be allowed. I've tried with firewall and antivirus off… no change. 3CX Ver 10 running on Windows 7. We made no changes to the host computer other than the Windows recommended updates at the beginning of February. Logs show "Authorization system can not identify source of … [invite]" I have the full log for the call attempt if it would help. Are there any changes Windows updates could make that would cause this problem? Are there any other "common" settings that might get changed that would cause this?