Raspberry Asterisk GSM Gateway

Some great work has been carried out as part of the Raspberry Asterisk project allowing 3G USB dongles to be used to make outgoing phone calls, creating a VoIP to GSM gateway.

They suggest this could be used where indoor mobile coverage is poor, using high-gain antennas to receive signals.

I’m sure I have an old Huawei dongle in a drawer somewhere, perhaps it is time to dig out a Pay as You Go SIM and see what happens.