| 摘要 |
PURPOSE:To attain a hooking function independent of perception, by using one of unused keys of a pulse dialler as a key to be exclusively used for hooking. CONSTITUTION:When a telephone call from a line wire is able to temporally hold and connectable to an extension, the exclusive hooking key is previously depressed. Information indicating a code to be exclusively used for hooking is sent from a key interface 21 to a control part 24. Receiving the hooking information, the control part 24 calculates the number of pulses to be outputted from the natural oscillation frequency of an oscillator 29 and hooking brake time, specifies an output counter 23 to output pulses, and turns off a transistor Q only for the hooking brake time. |
