JPS6244759B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a representative selection method for an automatic exchange.

The conventional representative selection method only monitors the busy state of the telephones accommodated in the representative group. Therefore, when the telephone of an absent subscriber is selected, a ringing signal continues to be sent, which has the disadvantage of lowering the call completion rate.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks by providing a presence/absence display memory that can be rewritten by dial signals from a subscriber's telephone. To provide a representative selection method which allows a calling signal to be sent only to the telephone of a person.

According to the present invention, it is possible to obtain a representative selection system in which an automatic exchange is equipped with a memory that can be rewritten by dialing signals from a subscriber's telephone. In other words, the feature of the present invention is that in the representative selection method of an automatic exchange, which selects one telephone among a plurality of telephones assigned the same representative number,
means for setting the telephone in a first state or a second state corresponding to each of the telephones, and selection by a representative number when the telephone is set in the first state when the telephone is free; and means for rejecting the selection by the representative number when the telephone is set in the second state, and when one telephone among the plurality of telephones is selected by the representative number, if the telephone is empty and the telephone is set to the second state. Only telephones set to state 1 are selected.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the invention.
In FIG. 1, a telephone 11 is housed in a line relay group 12 and is further connected to a link 14 via this line relay group 12. In FIG. In addition, the line relay group 12 has a presence/absence display memory 13 for each telephone, and via a lead 21 and a representative selection circuit 17, free information or busy/absent information is sent directly to the marker 16 via a lead 22 to the outgoing call register 15. Receive dialing information from. When the telephone set 11 accommodated in the representative group is given an indication that the subscriber is absent, it is taken off-hook and receives a dial tone, and a special number representing the subscriber absence is dialed. At automatic exchanges, call register 15
The dialing information of the special number is sent to the marker 16, and the presence/absence display memory 1 corresponding to each telephone
3, send out the reed 20 to the earth. This presence/absence display memory 13 is thereby configured to control the representative selection circuit 1
Lead 2 to indicate subscriber absence indication for 7.
Release 1. Further, even during a busy time, the contact 18 of the cut-off relay is opened, and the lead 21 is opened.
A service set tone is sent to the telephone set 11 indicating that there is no subscriber, and when the telephone set 11 is taken on-hook, the calling register 15 and marker 16 are restored and other call processing can be resumed. At this time, the lead 20 is opened. Marker 16 when the representative selection number is dialed on another calling telephone.
scans the representative selection circuit 17, but the lead 21
A ringing signal is sent to other telephones accommodated in the same representative group by picking up the telephone of the absent indicating subscriber whose telephone is open and the busy telephone. When an individual number is dialed on the calling telephone, marker 16
scans through the lead 22 whether the called telephone is busy, so that if the called telephone is free even if the subscriber is absent, a ringing signal is sent to the called telephone. Telephone 1 showing subscriber absence indication
To cancel the subscriber absence display from step 1, go off-hook again, receive a dial tone, and then dial the special number. At this time, marker 16 is lead 20
sends out the earth's energy again. When telephone 11 is turned on, marker 16 is restored, lead 20 is released, and presence/absence display memory 13 sends a presence display to lead 21.

FIG. 2 is a circuit diagram of the presence/absence display memory 13 according to the embodiment of the present invention. This presence/absence display memory 1
3 opens the lead 21 by sending out the ground air pulse to the lead 20 and displays the subscriber absence indication on the marker 16, and closes the lead 21 again when the ground air pulse is sent out to the lead 20 again. Marker 16
This is a flip-flop circuit that displays the presence of a person.

As described above, the present invention is equipped with a presence/absence display memory, thereby making it possible to provide a representative selection circuit that sends a ringing signal only to the telephones of vacant subscribers in a representative group. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of a presence/absence display memory according to an embodiment of the present invention. 11...Telephone, 12...Line relay group, 13...Presence/absence display memory, 14...Link, 15...Call register, 16...Marker, 1
7...Representative selection circuit, 18...Cut-off relay contact, 20...Lead, 21...Lead, 22
...Lead, 30...Relay, 31...Relay,
32...Resistor, 33...Resistor, 40...Relay 3
0 contact, 41... Relay 30 contact, 42...
Contact of relay 31, 43... Contact of relay 31.

Claims (1)

[Claims] 1 Multiple telephones assigned the same representative number and each of which is set to one of the following states: a first state that allows selection by the representative number, and a second state that rejects selection by the representative number. In the representative selection method of an automatic exchange, if the telephone is set to the first state, the setting of the telephone is changed from the first state to the second state by operating the telephone. means for changing the setting of the telephone from the second state to the first state by operating the telephone when the telephone is set to the second state; Be prepared,
A representative selection method characterized in that when one telephone among a plurality of telephones is selected based on a representative number, only telephones that are free and set to the first state are selected.