IP call to a LAPTOP w/ usb modem with simcard

Have you tried Skype or Google Voice?

Thanks for your comment, i have already use skype and that is not what this topic is incline to, i do lots of traveling and i would want to be able to connect to my own modem with sim to do the calls, since in the first place the laptop has a static ip address

If you have a home phone line, you can setup a trixbox or other asterisk based system and connect your laptop via a SIP trunk back to the trixbox to make calls using your existing home phone without having to pay for any extra monthly fees. If you don't have (or don't want to have) a home phone line, you would have to get a SIP trunk from a provider and pay the monthly fee for that. There are some free ones out there, but they are very limited in what they can do and numbers they can call and typically charge for most calls.

i have one similar setup like that in my office, i want to use the usb modem w/ simcard for its mobility purposes. because the modem can be use for calling locally, i just want to TRY to use it over ip as an experiment

For testing purposes, one of the free SIP providers may work just fine. The only thing in addition to that that you will need would be a softphone. In my experience, X-Lite is pretty simple and free. http://www.counterpath.net/x-lite.html

As for the trunk, I would give this a shot:

http://www.ipcomms.net/product-freedid.html

That should at least give you enough to test the modem pretty well. Inbound calls are free, outbound are $.02/min.

Thanks for the reply

I have recently found a way to go around this i just bought a go ip equipment to answer my problem hope you can check this out , it is really cool all you have to do is place an ip,

http://etross.com/products_detail/&productId=437976fb-f...