| 摘要 |
PURPOSE:To make connection control on extension subscribers in accordance with their service classes even when a trunk wire incoming through a private line is connected, by additionally transmitting information indicating incoming of the trunk wire when the telephone number of a called privated line subscriber is sent out. CONSTITUTION:When a call from a trunk wire incoming to a trunk wire trunk COT is addressed to a private line subscriber STA-A of an electronic exchange PABX-B, the operator of the attendant board sends out the call to the PABX-B through a private line trunk TLK by adding the main wire incoming information to the call. At the PABX-B the main wire incoming information is detected by means of a register adaptor IRADP. When the service class of the subscriber STA-A includes trunk wire incoming, the trunk TLT is connected to the subscriber STA-A, but, when his service class does not include trunk wire incoming, a connection inhibiting sound is sent to the operator of the attendant board ATTCON of the electronic exchange PABX-A. |
