FIELD: telephone communications; protection of trunk communication system users from unauthorized access. SUBSTANCE: device is installed in telephone exchange at line input of telephone set user and has counter and speaker verification module, their inputs being connected to communication line and outputs, via INHIBIT gate to control input of switch connected in parallel with communication line through shunt; speaker verification module is connected to memory unit wherein user s password is entered. EFFECT: enhanced reliability of protecting users of wire and radio telephone sets against unauthorized access. 2 cl, 1 dwg
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