JPS63178648A - Private electronic branch exchange system - Google Patents

Abstract

PURPOSE:To widen the application range of a transfer function by providing a transfer destination type area to the calling state table of each subscriber extension telephone set so as to transfer a call to a desired trunk line. CONSTITUTION:When a telephone set 12 hooks off and a special number for absence transfer and representing the absence transfer to a trunk line is dialed and the subscriber number of the trunk line of the transfer destination is dialed, then a master controller 20 sets the absence transfer state flag of the calling state table of the telephone set 12 to the state of 'during transfer' and the subscriber number of the trunk line being the transfer destination is stored in the transfer destination number area. In hooking off the telephone set 11 and dialing the subscriber number of the telephone set 12, the master controller 20 calls the calling state table of the telephone set 12 from each calling state table stored in the main storage device 21, reads the subscriber number of the transfer destination from the transfer destination number area to operate a trunk line circuit 15, thereby applying absence transfer to the trunk line 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a private electronic branch exchange system having a call forwarding function.

(Prior Art) FIG. 3 shows the configuration of a conventional private branch exchange system, in which 1, 2, and 3 are subscriber extension telephones (hereinafter referred to as telephones), and 4, 5, and 6 are telephones 1, 2, . 3 is a subscriber circuit, 7 is a network, 8 is a main controller, 9 is a call status table (see FIG. 4) consisting of a subscriber number, telephone status, call forwarding status flag, and forwarding destination number.
2.3 Separately stored main memory, 10 is a ringing generation circuit.

In the conventional example configured in this way, the telephone 2 is taken off-hook, and the special number for call forwarding and the forwarding destination telephone 3 are sent.
When you dial the subscriber number of.

The main controller 8 sets the call forwarding status flag in the call status table of the telephone 2 to "Forwarding" (value = 1), and also enters the subscriber number of the telephone 3, which is the forwarding destination, in the forwarding destination number area. Remember.

Therefore, when the telephone 1 is taken off-hook and the subscriber number of the telephone 2 is dialed, the main controller 8
calls the call status table for telephone 2 from among the call status tables stored in
), the subscriber number of the telephone 3 which is the forwarding destination is read out from the forwarding destination number area, and the ringing generation circuit 1
A ringing pressure from 0 is applied to the subscriber circuit 6 to ring the incoming bell of the telephone 3, and the subscriber circuit 6 is operated to transfer the call to the telephone 3.

(Problems to be Solved by the Invention) However, in the conventional private branch exchange system, the forwarding destination is the extension telephone 1, 2, . and 3, there was a problem that the scope of use of the transfer function was narrowed.

The present invention has been made in view of such problems, and an object of the present invention is to provide a private electronic branch exchange system in which the range of use of the transfer function is widened by making it possible to transfer to an extension line or a central office line. It is.

(Means for Solving the Problems) In the present invention, a transfer destination type area is provided in the call status table of each subscriber's extension telephone, so that calls can be transferred to a desired central office line telephone.

(Function) According to the present invention, by storing the forwarding destination type and the central office line number, not only an extension but also a central office line can be specified as the forwarding destination.

(Embodiment) FIG. 1 shows the configuration of an embodiment of the present invention, in which 11 and 12 are subscriber extension telephones (hereinafter referred to as telephones), 13
and 14 are subscriber circuits for telephones 11 and 12, respectively;
15 and 16 are office line circuits connected to the office lines 17 and 18, respectively; 19 is a network; 20 is a main controller; 21
is a call status table (second
This is a main storage device that stores telephones 11, 1.2 (see figure) separately.

In this embodiment configured as described above, the telephone 12 is taken off-hook, and a special number for call forwarding and a special dial indicating call forwarding to a central office line, such as "#" in the case of a Bush type telephone, are sequentially entered. After dialing and dialing the subscriber number of the forwarding destination office line, the main controller 20 sets the missed forwarding status flag in the call status table of the telephone 12 to ``''.
"Transferring" (value=1) is set, and the subscriber number of the central office line that is the transfer destination is stored in the transfer destination number area.

Therefore, when the telephone 11 is taken off-hook and the subscriber number of the telephone 12 is dialed, the main controller 20...

The call status table of the telephone 12 is called from among the call status tables stored in the main storage device 21, and the telephone status is empty (value = 1), and the call forwarding flag is forwarding (value = 1). , and the transfer destination type is a central office line (value =
1), select the vacant station line 17 or 1 from among the station lines.
8, and if the station line 17 is empty, the main controller 2
0 performs a capture operation on the station line circuit 15. and,
When acquisition is completed, the network 19 is controlled to establish a connection between the telephone 11 and the office line circuit 15, and the telephone 12 selects the transfer destination station from the transfer destination number area of the call status table. Read out the subscriber number of the line,
Operate the office line circuit 15 and transfer the subscriber number of the office line to the office line 17.
Forward missed calls to.

Note that transfer to an extension is performed in the same way as in a conventional private branch exchange system.

(Effects of the Invention) As explained above, according to the present invention, it becomes possible to transfer to an extension or a central office line, and for example, when you go out, you can input the subscriber number of the central office line of your destination on your own extension telephone. If registered, it becomes possible to transfer calls to the central office line, which has the effect of widening the scope of use of the transfer function.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a call status table in an embodiment of the present invention, Fig. 3 is a block diagram of a conventional private branch electronic switching system, and Fig. 4 is a block diagram of a conventional private branch exchange system. It is a call state table in an electronic switching system. 11, 12...Subscriber extension telephone, 13.14...
Subscriber circuit, 15.16... Office line circuit, 17°18.
...Station line, 19...Network, 2゜...Main control device, 21...Main storage device. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] In a private electronic branch exchange system that has a call forwarding function,
If the transfer destination type is stored in the call status table for call forwarding processing, and the calling subscriber's extension telephone is in the process of call forwarding, the call is transferred to the extension or central office line preset in the call status table of the subscriber's extension telephone. A private electronic branch exchange system characterized by forwarding to a telephone with a forwarding number.