A communication network includes a messaging system connected to a mobile switching center in a cellular network. When calls to a wireless device go unanswered, the messaging system answers the calls and records a message for that device. The messaging system sets a message waiting indicator (MWI) flag...http://www.google.fr/patents/US6298231?utm_source=gb-gplus-shareBrevet US6298231 - Methods, systems, and devices for transmitting messages to wireless devices
Methods, systems, and devices for transmitting messages to wireless devices
