Hi Brian. It was my first thought when I saw the logs... but the strange thing is that I have no NAT problems if I configure an extension in default context like this: <extension name="iptel"> <condition field="destination_number" expression="^iptel(.*)$"> <action application="bridge" data="sofia/internal/$1@iptel.org"/> </condition> </extension> With this configuration I call iptel[my_iptel_account] without any problem from my sip phone registered to freeswitch. I'll double check the NAT configuration in sofia module but from the logs I see it was configured correctly using UPNP. Thank you Denis ----- Messaggio originale ----- Da: "Brian West" <brian@freeswitch.org> A: "FreeSWITCH Users Help" <freeswitch-users@lists.freeswitch.org> Inviato: Lunedì, 27 febbraio 2012 3:28:51 Oggetto: Re: [Freeswitch-users] 401 Unauthorized in iptel external gateway Its nat. notice the 401 Via: SIP/2.0/UDP 192.168.1.2:5080:5080;rport=14802;branch=z9hG4bKjS09v88N9p59K IT says I received you from 192.168.1.2:5080 but port 14802 so go fix your nat and fix your external profile with the right info/ip's in it. /b Sent from my hospital bed On Feb 26, 2012, at 8:14 PM, Vitalie Colosov wrote: Maybe some explanation can be received from these lines: nta: received 401 Unauthorized for REGISTER (24810914) nta: 401 Unauthorized has fatal syntax errors nta: timer E fired, retransmit REGISTER (24810914) Curious what are those "syntax errors" which other soft phones are able to overcome... Maybe it does not like this message? Warning: 392 217.9.36.145:5060 "Noisy feedback tells: pid=868 req_src_ip=122.176.168.104 req_src_port=14802 in_uri=sip: sip.iptel.org ;transport=udp out_uri=sip: sip.iptel.org ;transport=udp via_cnt==1" _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org