maemo.org - Talk - usb gsm modem for phone calls?

Just sitting drinking my coffee i had the idea that it should be possible
to write a programm wich is able to make phone calls via a external usb gsm modem connected with the usb host hack.

This would be a way to transform the 770 to a all in one device.

For sure i know that this would be no solution for real life situations but i think more about, if it possible to do it and than do it ;-)

so for technicans among you what you thing about this unpractical but challenging idea?

Regards
Sebastian