| 摘要 |
PURPOSE:To make automatically a mutual call connection between a calling and a called subscriber when the called subscriber releases absence registration, by reserving operation of the calling subscriber when the telephone call is made during the absence of the called subscriber. CONSTITUTION:The calling subscriber SUBB performs hooking operation once hearing a message of SUBA absence from a TKT. Then a central controller performs registration processing as an automatic presence connection. The SUBA returns and resets the registration and then a number dial CC for absence registration resetting discriminates the resetting of the registration and checks whether an automatic presence connection with the SUBA is registered or not; when the registration of the SUBB is discriminated, a ringing tone trunk RGT is acquired and the SUBB and RGT are connected together through a network NW channel 5 to call the SUBB. When the SUBB answers, a local trunk IOT is acquired to connect the SUBB to the F-side terminal of the IOT through a channel 6 and once a busy tone is returned from the IOT to the SUBB, the RGT is acquired to connect the RGT to the SUBA through a channel 7, thereby sending a call signal to the SUBA. |
