My FreeSWITCH is behind nat, and I have calls coming in from internet on port 5060. This works great after I got the IP range set in acl.conf.xml. But the calls get hung up after 40-50 seconds into the call for no reason at all. But after I restart FreeSWITCH, this annoying behaviour doesn't happen. I traced both cases, when the call is hung up here: http://pastebin.freeswitch.org/4784 It looks like FreeSWITCH is resending SIP/2.0 200 OK for some reason, until the other end gives up and sends a BYE sip:Unknown@81.201.82.28 SIP/2.0 But after a restart, FreeSWITCH behaves much better, and the call goes on until one of the parties hang up normally: http://pastebin.freeswitch.org/4785 I am not sure if this is a bug, or a misconfiguration of FreeSWITCH FreeSWITCH Version 1.0.trunk (8900) Ivan