Go to these links.  They should have the software and some info on how to set up these modems.
http://www.linmodems.org/
http://www.fatshady.co.uk/linux/modem.php
Not sure if the second one will help much.
Note, I would recommend that if you can, buy a external serial modem.  They are easier to set up and work very well with Linux.  If you have a laptop and can't then you are stuck with what you have.
When I say a external, that means serial not USB.  I have read where some USB modems are winmodems too.
Hope that will get you started in the right direction. 
Iran huh?  This world is getting smaller everyday.
Later 
 
   
   
  