| 摘要 |
PROBLEM TO BE SOLVED: To provide a telephone charge accounting system which gives profit to both a calling subscriber and a called subscriber. SOLUTION: This system is equipped with a server 50 for special accounting which decides whether a telephone call should by charged for normally or specially at a rate higher than the normal rate. A telephone charge by the special accounting is collected from an object calling subscriber of the special accounting and a part or the whole of the difference from a normal telephone charge is returned to the called subscriber.
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