Patent ID: 7089034

Claim:
In a cellular or cellular-like interface apparatus for coupling a landline telephone instrument to a cellular or cellular-like radio transceiver associated with a cellular or cellular-like radio network, said cellular or cellular-like interface apparatus comprising cellular or cellular-like interface means comprising computer means for coupling a landline telephone instrument to the cellular or cellular-like radio transceiver associated, the improvement comprising: Initial installation testing means for testing the presence of line voltages on a landline telephone communication path capable of being connected to a public switched telephone network, said initial testing means comprising operational-line voltage detecting means for detecting operational line voltage on the landline communication path indicating the landline communication path operative connection to a public switched telephone network, whereby if no such voltage is detected, said testing means indicates that said interface means may be coupled to the landline communication path; said testing means further comprising indicating means for indicating the lack of detection of said operational line voltage detecting means, whereby upon lack of such voltage being detected, said indicating means indicates that said interface means may be operatively installed with said landline telephone communication path, in order to prevent damage to said cellular or cellular-like apparatus.