A telephone interface device adapted for the transmission of recorded audio files over communication channels is disclosed. The telephone interface device comprises electronic circuitry contained within a case member. The circuitry includes a plurality of electrical connection jack members, each accessible via an aperture in the case member, with each electrical connection jack member in communication with at least one control switch member mounted in an aperture in the case member and operable from exterior the case member. The plurality of electrical connection jack members includes a first jack member adapted for connection to a telephone handset, a second jack member adapted for connection to a telephone headset, a third jack member adapted for connection to input of an audio file player device, a fourth jack member adapted for connection to output of an audio file player device, a fifth jack member adapted for connection to a speaker of an audio file player device, and a sixth jack member adapted for connection to a microphone. The control switch members include a first control switch member for selectively activating or deactivating the speaker of the audio file player device, a second control switch member for selectively sending audio from the speaker of the audio file player device to the telephone handset or sending audio files directly from the audio file player device to the telephone handset, a third control switch member for selectively connecting the telephone headset to the audio file player or the telephone handset, a fourth control switch member for enabling or disabling recording of audio by the audio file player device, and a fifth control switch member for enabling or disabling the microphone. A message generated by the audio file player device from a recorded audio file is transmitted through the telephone interface device to the telephone handset connected thereto.