FIELD: switching systems for telephone communications. SUBSTANCE: proposed circuit is set up of first line converter for converting first telephone-set data into analog signal in time-division switch message readout mode; filter for suppressing stray audio signal in analog signal shaped by first line converter; limiter for analog signal free from stray audio signals; first PCM converter for converting limiter output signal into PCM data entered in time-division switch and transferred to second telephone set; second line converter for converting PCM data from second telephone set into analog signal; filter for suppressing echo signal in analog signal shaped by second converter meant to convert analog signal free from echo signal into PCM data entered in time-division switch and transmitted to second telephone set. EFFECT: provision for suppressing echo signal in telephone communications dispensing with handset. 2 cl, 3 dwg
