Abstract: An apparatus for interfacing between a telephone instrument and a wireless communication system is disclosed. Subsystems of the apparatus include: telephone answering; telephone handset acoustic coupling (called "audio transducer"); transceiver acoustic coupling (called "audio mixing"), and a voice-loop circuit which isolates incoming and outgoing communication signals.Features of the invention include the use of the second (transceiver) acoustic coupling subsystem which allows, among other functions, any microphone (supplied with the transceiver) to be acoustic impedance-matched to the apparatus.