METHOD FOR TARIFF CALCULATION OF PBX CALLS AND TARIFF SCALE OF CHARGES THEREFOR

Charge counter system for PBX comprising cable status analysers with line detectors and digital tariff call cost counters connected to a common controller, characterized in that (n) subscriber's telephones (Ab1.. Abn) connected in parallel to a private branch exchange (CA) through one common already known detector of subscriber's lines (DLA) and (m) inter-exchange lines (1LM...mLM) of a superior municipal exchange (CM) which are connected in parallel to the private branch exchange (CA) through a common already known detector of inter-exchange lines (DLM) have the both already known detectors of subscriber's lines (DLA) and inter-exchange lines (DLM) on the signal output connected to the common detector of private branch exchange state (DSCA) whose output is connected to the call charge counter system (UT).