| 摘要 |
PURPOSE:To report the registering release miss of the incoming service by controlling the selector switch of an originating register by a controller on a basis of incoming service registering information in a memory. CONSTITUTION:When subscriber SUB receives the incoming service, controller CC registers subscriber SUB in memory DR on a basis of information obtained by means such as dialing. A prescribed incoming service is performed by CC if incoming is caused for subscriber SUB after that. In case that subscriber SUB issues a calling request under this state, CC detects immediately the state and connects SUB to OR and operates selector switch R to transmit a special tone to subscriber SUB. Therefore, subscriber SUB hears no normal dial tone but the special tone, so that it may be reported that incoming service registering is performed and release is forgotten. CC switches R again after transmitting the special tone for a fprescribed time, so that registering release can be performed. |
