A wireless communication system is disclosed comprising a call controller to establish a communication session in a first communication mode between two or more users; receive a request from at least one of the users to switch the first communication mode of the communication session to a second communication...http://www.google.de/patents/US7415282?utm_source=gb-gplus-sharePatent US7415282 - Wireless communication system providing seamless switching between full-duplex and half-duplex modes
