| 摘要 |
PURPOSE:To transfer a call to an extension subscriber which is busy to another extension subscriber by allowing a general telephone set which is busy to dial directly a special service number through a private electronic branch exchange. CONSTITUTION:An interface part 2 is provided corresponding to a subscriber as a general telephone set 1, and an interface part 4 and a dial receiving and calculating circuit 3 are provided corresponding to a private electronic branch exchange. The state change of the subscriber 1 (including dial pulse) is stored in the dial receiving and counting circuit 3 temporarily and then transmitted to a central control part through the interface part 4. The central control part analyzes the obtained information, and holds the latest subscriber which is offered service when the information indicate an extension number of the electronic private branch exchange to perform transfer control. Therefore, an extension number is dialed directly during service without any hooking operation. |
