Remote delegate interface unit shall enable people at remote locations to participate in conference meetings. It provides an audio input/output for local PC connection to remote PC participant. It supports PC to PC call connection over networks using third party software/service not provided by TOA. It provides RJ-11 connection to connect with handset connector on telephone base unit for calls connecting to remote telephone participant. Speech mode selectable between auto (VOX) and manual (Talk key on-off switching function)providing contact closure output when microphone is active which can be used for camera call-up, tally or other devices. It is powered by TS-770 central unit supplying 35Vdc, under 30mA line. It provides balanced, mini jack, input equipped with volume control (–60dB, 200 ohms). It provides balanced, mini jack output equipped with volume control (–60dB, 22 ohms).