| 摘要 |
PURPOSE:To attain hot line connection automatically, when a telephone is not dialed within a prescribed time after off-hook, by providing a storage circuit of a subscriber number of hot line connection and a timing detection circuit to a PABX. CONSTITUTION:When an extension subscriber A of the PABX of a station A hooks up a handset, a register R and the subscriber A are connected. The register R monitors hooking at a timer 1 and when no dial pulse is incoming within a prescribed time, a hot line detecting means 2 is operated, a hot line order HO and number information NI are transmitted at a fixed information storage circuit 3, and the number information is transmitted to a station B via a relay line trunk TRK by using a sender S. Thus, the hot line connection is completed and the call is attained. When dial pulses come within a prescribed time after off-hook, the pulses are received at a number reception circuit 4 of the register R for the normal connection. |
