| 摘要 |
PURPOSE:To improve service to an incoming call, by dialing a special number after holding a call temporarily while the extension is in service, and making a connection for answering to an incoming call to another extension. CONSTITUTION:Extensions C and D are engaged with each other through a trunk IOT. At this time, a junction line trunk PVT terminates and when an extension A is placed in a calling state, the hooking of the extension C allows a central controller CC to starts a call-back connecting mechanism CBC, connecting the extension C to an oscillating register trunk OCT. The extension C selects the special number for making a request for interception after receiving a tone from the trunk ORT. The mechanism CBC discriminates it to start a pickup mechanism PUC, reporting that. The mechanism PUC detects the extension A in service in the same extension group with the extension C to set a channel in a network NW, making a connection between the trunk PVT and extension C. Consequently, the extension C answers to the trunk PVT as a substitute for the extension A in absent state. |
