Open source PBX software that runs under Linux and other ... Supporting traditional telephony (TDM) as well as voice over IP (VoIP), Asterisk is written in C and uses the Unix standard POSIX ...

Asterisk is the heavyweight of open-source PBX platforms, commanding some 88 percent ... Digium makes the platform available in a variety of ways, both as free code and as value-added telephony ...

The project intends to be an interface between a payphone and an Asterisk PBX system. On the hardware side, the controller board is capable of switching various high voltage signals required for ...