THE MFJ-624E can me configured for use with a radio having either a 8-pin round connector or an 8-pin modular connector. The MFJ-624E is designed to remain permanently installed between a transceiver, a telephone line with a modular connector, and a telephone receivers handset. The telephone and the radio will operate as if the phone patch were not in the circuit when the Patch IN/BYPASS switch is in the BYPASS (out) position.
This item is designed to be used with a control operator present, typically on an HF radio with VOX circuitry.
It cannot be programmed or used as a remote phone patch.