A radio access network (RAN) receives a request to route a call from a caller to a mobile station, assigns a wireless traffic channel to the mobile station for the call, and detects a no-answer condition for the call (because a user of the mobile station does not answer the call within a predetermined...http://www.google.de/patents/US8169962?utm_source=gb-gplus-sharePatent US8169962 - Method and system for transmitting a voice mail indication to a mobile station
