Perhaps the Modem-HOWTO can help ?
> > Hi all, > > I thought this list might be the best place to ask: > > What's the easiest way to get an init string into the modem? > Specifically, I want "AT#CID=1" to put the modem into caller-id reading mode. > Is there a simple way to do something like 'echo "AT#CID=1" > /dev/modem'? >