Abstract: A method and apparatus for preventing harmful foreign voltage from being applied to a fixed wireless terminal. Upon the detection of a harmful voltage, the fixed wireless terminal is prevented from being connected to the tip-and-ring lines of a premises' land-line. The voltage is detected by a voltage-detector. The invention may also be used to disconnect the normally-closed connection of the fixed wireless terminal with the tip-and-ring lines of the premises' land-line upon the detection of a harmful voltage on the tip-and-ring lines.

Abstract: A method of determining the end-of-dialing of a currently-dialed telephone number entered into a land-type POTS telephone coupled to a cellular transceiver via a cellular interface unit. The software of the invention will automatically generate a SEND signal upon the matching of a presently-dialed telephone number with a previously-dialed telephone number stored in the memory of the cellular interface unit that has been dialed on the telephone of the system a preset number of times, such as two. The software of the invention stores the list of previously-dialed telephone numbers by numerical order by time-ordering, or random storage of numbers, and continually updates the list for each new dialed telephone number. The software of the invention will allow one of the prior-art, end-of-dialing methods to determine the generation of a SEND signal for those presently-dialed telephone numbers that are not matched with a stored, previously-dialed telephone number.