Atcom IPPBX (APBX) is a range of powerful and energy efficient systems that are designed to offer big business features to the small business user. A flexible VoIP system, the APBX is built around the popular Asterisk 1.8 application and offers all of the features you would expect from a Telephone system plus a host of advanced features that you probably did not. The APBX is also a hybrid system that has built in Gateway functionality to allow support for traditional PSTN and GSM connections.