| 摘要 |
PURPOSE:To select a response opposite by constituting the titled exchange so that call signals of different patterns are rung periodically and in order when arrival calls are overlapped at an extension telephone set. CONSTITUTION:When a central control unit 10 detects another arrival call B to an extension telephone set 1 during the arrival call from an A, a RINGPTN number at the arrival time of the B is referred, and a call data is set at a RINGPTN number column at the second stage of an arrival call state table RINGTBL1 and a call original column, and a RINGFLAG column is cleared. At such a time, when the sending of the call signal of one cycle against the arrival call A is completed, the count value of a counter COUNT1 is cleared, and the RINGFLAG column against the arrival call A is cleared, and simultaneously, the RINGFLAG column corresponding to the arrival call B is set, and at the next cycle,the call signal of the arrival call B is sent out. And so forth, the call signal of the arrival calls A and B is sent out alternately by every cycle. therefore, the distinction of the call signal sending at a certain time can be obtained by referring to the RINGFLAG column.
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