| 摘要 |
A private branch exchange for controlling the calls terminated from a direct-in line receives a call set-up message containing termination information including termination address information and termination subaddress information. The termination subaddress information is supplied by the originating station and includes a security code and an internal station number. A dial signal deciding part converts the security code into a class-of-service number in accordance with a security code table containing to class-of-service numbers. The services of the private branch exchange which are offered to a subscriber, for example termination to station or origination of call, are determined by indexing a class-of-service table containing class-of-service information using the class-of-service number.
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