I have already implemented a background processing task for periodically reenabling the bonjour protocol, however, the problem is that the interval between waking up the background task is about 10 min, while I need a much shorter interval (5-10 sec). Is there a way to configure the OS to use shorted wake periods ?

VoIP supports LAN and works well peer to peer. The problem is only on mobile devices because a VoIP application cannot receive an incoming call while in background