Hello *'s, Every time I started my asterisk error shows: chan_sip.c:Got 200 ok onRegister that isn't a register. Failed to authenticate in Register to <sip:adnan.007@iptel.org>;tag=asfeaa71f Maximum retries exceeded on call xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx@192.168.10.189 for seqno 107 (Request) Registration for adnan.007@195.37.77.99 timed out ,trying again. __sip__xmit:sip_xmit of 0x810894 (len 436) to 195.37.77.99 returnes -l:Invalid Argument I calls locally from my sip phone easily and from local phone to sip phone but i can't calls long distance every time itries above error shows on my screen am i missing something in my sip.conf file. sip.conf [general] port=5060 bindaddr=192.168.10.189 context=sip disallow=all allow=gsm nat=1 [101] username=101 type=friend host=dynamic secret=xyz context=from-sip callerid="101" dtnfmode=rfc2833 canreinvite=no qualify=1000 [iptel] username=adnan.007 type=friend secret=123 host=dynamic fromdomain=iptel.org qualify=1000 nat=1 context=outgoing May be I am doing something wrong kindly pointout my mistakes and clear my concepts. Thanks In Advance. Adnan Ahmed.