System and method for providing the precise location of a cell phone making an emergency call

摘要

The present invention relates to providing precise location data to a 911 operator of a cell phone operator who initiates a 9-1-1 call and, more particularly, to the interaction of transmitting circuitry in a cellular telephone and complementary receiving circuitry in a landline telephone or stand-alone unit. When a cellular 9-1-1 call is made within proximity of a landline telephone or a stand-alone unit, an interaction takes place between the enabled cell phone and the landline telephone. Upon receiving and decoding the cellular transmission, the landline telephone or stand-alone unit transmits a 9-1-1 call which provides more precise location data (in the form of the landline telephone's subscriber's identification) to a 911 operator than if the 9-1-1 call was simply connected to the operator from the cell phone. The present invention has further applications for locating a 9-1-1 call from a landline telephone connected through a PBX-type master switching box.