[Asterisk-Users] Can't Register!

[Adnan Ahmed]

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 at iptel.org>;tag=asfeaa71f
Maximum retries exceeded on call 
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx at 192.168.10.189 for seqno 107
(Request)
Registration for adnan.007 at 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.