I am proposing a quadro 2x for a small office install - they make many calls from the office to a couple of remote workers and I would like to consider a sip/gsm gateway to reduce these call costs. Has anyone tested any with the quadro - they would not need to make more than one simultaneous call.

Something like the Portech MV-370....

I would like to setup a few specific call routing rules so that if for example
01234567 is dialled it roues directly to the gsm g/w on out over the gsm sim card.