Hi All, I have 3CX Free version installed on a Windows XP SP 2 machine and am using X-Lite softphones for testing. My PC has unlimited access out on internet and has a fully NAT-ed IP through Cisco PIX firewall (so all incoming ports are open). Calls internally are fine. Calls going out are fine. Calls coming in, however, is a different story. When placing an incoming call from a seperate PSTN system (landline or mobile) I receive sipgate anouncement of caller unavailable after a very long pause (around 60 secs) and get the following message in 3CX log; (edited to remove info) 11:10:09.309 Endpoint::findSource: Can not find source by following specs: From: 'calling number'; To: 'sipgatenumber'; Rline: 'sipgate id'; Contact: 'calling number' This entry appears twice, around 15 ms apart. Any ideas?