| 摘要 |
PROBLEM TO BE SOLVED: To surely perform a notice (caution) on no payment or delinquency in the payment of call tariffs even to an analog subscriber terminal for handling only audio signals with simple processing without increasing costs required for constructing the system. SOLUTION: A subscriber A of a caller and a subscriber B of a callee are connected and at the time of originating a call from the subscriber A, when the caller A has no payment or delinquency in the payment of call tariffs, it is announced by an analog audio signal from an announce device 113.
|
