FIELD: communication equipment. SUBSTANCE: the method consists in display and transmission of the continuity test requirement to the continuity test indicator contained in the leading address-name message, if the channel modulus characteristic needs a check at execution of an outgoing call to the opposite side, and connection of the voice channel to the continuity test signal transceiver for transmission of the continuity test signal via it; check whether the ready signal transmitted via the private line is received, back via the return line at a definite time; if the mentioned ready signal is received back, cancellation of transmission of the mentioned continuity test signal, cessation of timer count and disconnection of the above discontinuity test signal transceiver. EFFECT: facilitated procedure. 2 cl, 6 wdgr
