A method for improving the sound quality of voice signals transmitted during a call between two digital wireless telephones by diverting the call from a circuit switched network to a data network is disclosed. In accordance with the present invention, a call setup procedure using the circuit switched...http://www.google.se/patents/US7626978?utm_source=gb-gplus-sharePatent US7626978 - Method for diverting an ISUP talkpath to an IP talkpath
