| 摘要 |
PURPOSE:To improve the uregency and the flexibility by forcibly releasing the reserved state when a reserved subscriber dials a special number and performs a special operation including the hooking operation and reporting interruption or reservation release to the busy destination subscriber. CONSTITUTION:If a calling subscriber A performs the operation to reserve a called subscriber B after calling the called subscriber B and entering into the speaking state, the called subscriber B is set to the reserved state, and the calling subscriber A calls another called subscriber C and enters into the speaking state with another called subscriber C. When the called subscriber B calls back the calling subscriber A thereafter, the called subscriber B performs the reserved state releasing operation by the special number of the special operation such as hooking. By this operation, the reserved called subscriber B interrupts the service on a channel between the calling subscriber A and another called subscriber C in case of interrupting operation. Or the called subscriber B excludes another called subscriber C and enters into the speaking state with only the calling subscriber A, and another called subscriber C is set to the reserved state.
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