Arrangement for a payment system utilising a payment card within the telecommunication network

摘要: A payment system utilising a card (5) is employed for telephone set (1) which forms part of the general network and connected to central office (2) via subscriber's line (3). The are provided with first devices exchange signals line. include subsidiary identification concerned, second sensing residual value (5a) on card, third erasure possible indication after this has been used calls subject charge. also serves an installation separate from system, can comprise automatic parking installation. letter includes meter (14) Essentially correspond, as regards their function, devices. call communication together separated by means filter (11, 11', 13, 13', 16, 16') or be