Hi Guys After your guies replies now i have changed the machine .But this time i get little different problem i made following chnages in sip.conf [901] context=fromsip type=friend username=901 secret=901 callerid="Test2" <901> host=dynamic nat=yes canreinvite=no disallow=all allow=ulaw dtmfmode=rfc2833 callgroup=3 pickupgroup=3 qualify=1000 ;[902] ;context=fromsip ;type=friend ;username=902 ;secret=902 ;callerid="Test3" <902> ;host=dynamic ;nat=yes ;canreinvite=no ;disallow=all ;allow=ulaw ;dtmfmode=info ;callgroup=3 ;pickupgroup=3 ;qualify=1000 in extension.conf [fromsip] exten => s,1,Answer( ) exten => _9XX,1,Dial(SIP/${EXTEN},100,tr) exten => _5XX,1,Dial(SIP/${EXTEN},100,tr) exten => h,1,Hangup exten => t,1,Hangup exten => i,1,Hangup Now Asterisk 1.0.9, Copyright (C) 1999-2004 Digium. Written by Mark Spencer <markster@digium.com> ========================================================================[ Booting................Dec 14 15:23:05 WARNING[3478]: chan_oss.c:257 sound_thread: Read error on sound device: Resource temporarily unavailable .............................................................................Dec 14 15:23:07 WARNING[3478]: chan_skinny.c:2587 reload_config: Unable to get our IP address, Skinny disabled ............ ] Asterisk Ready. *CLI> Now from xpro lite software after configuring it for my machine when i try to connect to my machine i am unable to get connection it says unable to connect contact your network administratot.Althoug i am the network admin Plz tell me what to do Regard Talat