| 摘要 |
A switching system having at least an electronic exchange, a mail service system and an accounting system. When a mail service demanding subscriber requests the provision of a mail service, such as facsimile and voice to a plurality of other subscribers, the accounting system can issue a bill to the service demanding subscriber as usual, by employing an accounting ID coupling unit in mail system and an accounting ID separation unit in the electronic exchange. The accounting ID indicating the service demanding subscriber is coupled to each of the terminating numbers of the service receiving subscribers, and then separated therefrom in the electronic exchange to give same to the accounting system, while the terminating numbers are used for an exchange of calls, as usual.
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