Hey there, Congrats for the SIP client, it must be the best free client ever ! I've tested the software and it works well, even in the background. (I'm using my ISP provided SIP gateway) Only there is something surprising : when the iPhone is rebooted (if the battery is dead for instance), I need to start the application manually in order to receive calls. Once 3CXPhone has restarted, I can receive calls, even in the background. Why doesn't the application "start" during the iPhone boot process ?