CALL TARIFF COLLECTING METHOD AND ISDN TERMINAL

Japanese Patent JP3768618

B2

PROBLEM TO BE SOLVED: To enable use of an existing analog tariff collecting type telephone set, even when an analog line is changed to an ISDN line and a terminal is extended. SOLUTION: An ISDN telephone set 30 as an ISDN terminal receives a dial signal from an analog tariff collecting type telephone set 10, transmits a call setup message to call a callee, corresponding to the dial signal to an ISDN line network after obtaining charging information corresponding to the dial signal from a charging information center 20, connects a speech path of the tariff collecting type telephone set 10 and an information channel of the ISDN line together and simultaneously starts outputting a storage signal to the tariff collecting type telephone set 10 in a charging timing, based on the obtained charging information when the callee responds.