FIELD: communications engineering. SUBSTANCE: device has certain set of pulse-code modulating subscriber lines incorporating subscriber-line interface circuits for their interfacing with telephone line of switching system, impedance matching unit and coder/decoder, common bus referred to as pulse-code modulating signal channel passing telephone signal to and from subscriber according to time sharing mechanism for clocking engagement of telephone line, telemetering signal source that synchronizes signal telemetering and controls enabling or disabling of telephone call requested by n subscriber; it may also have buffer, signal selector, applied amplified signal controller, counter-cross filter, telemetering signal filter, band filter, coder, decoder, low- frequency filter, received amplified signal controller, ripple filter, operational amplifier, and telemetering valve. Use is made of telemetering signal suppressor for eliminating induced telemetering signal which must not be heard in sending and receiving sections during conversation over telephone line. EFFECT: improved design. 3 cl, 8 dwg
