| 摘要 |
PURPOSE:To perform service without a special trunk for conference telephone, by causing the output side of plural originating trunks of a crossbar switch-board to pass through the amplifier for service loss compensation to lead the output of one originating trunk to another originating trunk. CONSTITUTION:When subscriber SUBA performs special dialing, idle originating trunk OGT1 out of originating trunk groups DGT1-DGT4 assigned for conference telephone is acquired. Next, subscriber SUBA dials the number of subscriber SUBB automatically by the automatic transfer operation to call service equipment 2. Originating trunk OGT1 is held as it is. If subscriber SUBA hooks the handset, subscriber SUBB is connected to originating trunk OGT1 by the automatic transfer function. By repeating this operation after that, subscribers SUBC and SUBD are called and are connected to originating trunks OGT2 and OGT3 by service equipments 4 and 5. |
