Syn Ack writes "One of the engineers that works in my office spent his weekend porting Asterisk for running on the iPhone. It was done in one weekend. His webpage can be found here with all the details. For obvious reasons Asterisk can't interact with the GSM phone, but he does have it working with SIP phones. A wireless PBX in your pocket! We're not sure what value this has other than showing people just how far you can take an iPhone. If only Apple would open the environment up to development. So if you want a "PBX in your pocket" go grab Matt's code and give it a try."