Circuit arrangement for telecommunications switching systems with direct dialling

摘要: To implement the service features "mandatory calling party identification before start of a call, even over plurality telecommunications exchanges" and "calling telephone number display on called party's station" in entire national network, i.e. predominantly also direct-dialling dial-up exchanges, functional units (A) are provided according to invention for each subscriber group (Tln, Hdt); these case contain retrieval signal evaluator 2, an MFC transmitter 11, permanently programmed read memory 4a group, as well write 4b diode matrix 3 final digits within group. A unit B with tone 8, storing receiver 9 occupancy 10 assigned who uses feature operator's position. The evaluation relay AW disconnects from speech wires, suppresses metering (by connecting earth c-wire) (with awlV) initiates wire through-connection power selector concerned. then transmitted by 8 is evaluated 2 whose switching means F wires party. 11 transmits (in 4a, 4b), simultaneously completed through (3), emits termination signal, so that once more ... Original abstract incomplete.