Dear friends, anyone has some experience of cisco PIX configuration with sip, I suspect a nat problem, but i'm not sure .... My situation: Ser/Asterisk server on a real ip address, no firewall, open ip Grandtream phone, real ip address Xlite client, natted by pix with a internal/external direct conduit, allow any rule for inside/outside connections Tests made: direct call Grandstrem ---> ser ---> Xlite = ok Xlite ---> ser ---> Grandstream = ok ok now to the problem, I know this is a long explanation, but I badly need help, this looks to complex for me ! :) Grandstream calls 10, ser has this rule if (uri=~"sip:10+@") { rewritehostport("host.domain:5090"); t_relay_to_udp("host.domain", "5090"); break; }; call is forwarded to Asterisk, a menu is played, then an extension is called exten => *,1,Background(beep) exten => *,2,Dial,SIP/Xliteextention@domain|30|mt exten => *,3,Voicemail(u10) exten => *,102,Voicemail(b10) Xlite rings, but if I pick up calls are not connected, asterisk shows ringing, Xlite shows Connected. If I press Hangup on Xlite asterisk senses that and brings the grandstream call to voicemail, I hear the voicemail prompt from grandstream phone. Reversing the process everithing works absolutely fine: if Xlite calls asterisk, then a call is made to grandstream ext calls are connected. To make some more tests I tried using a non natted xlite, it works, that's the reason why i suspect that nat is the problem here. Any idea ? -- Best regards, Alessio mailto:alessiof@interconnessioni.it