what are you trying to do with: user=Asim Arif
Are you trying to set the CID ? Also do you get any errors with the phone registering or just when trying to make a call ? What do you have in extensions.conf ?
Thanks a lot for the reply but my problem luckily has been resolved. Yea i was trying to register my softphone with asterisk box. The mistake was that i wrote host=mymachineip instead of writing host=dynamic n defaultip=mymachineip.
Anyways, thanks again for all of your help. This forum is really helpful for me.