A wireline interface permitting a cellular telephone transceiver to originate and receive calls using both cellular and wireline services. The invention permits a subscriber unit to operate as a standard cellular telephone when it is disconnected from a land-based telephone line, and as both a full-featured...http://www.google.es/patents/US5526403?utm_source=gb-gplus-sharePatente US5526403 - Wireline interface for cellular telephone
