JPS63115447A - Trunk queuing system - Google Patents

Abstract

PURPOSE:To improve the availability of a central office trunk and to reduce the busy rate of the calls received from a trunk line with a private branch exchange, by storing a subscriber number and the identification number of the private branch exchange to which the relevant subscriber belongs and carrying out the connection processing with an idle central office trunk through a waiting means. CONSTITUTION:When the subscriber of a private branch exchange A dials '0', for example, for originating set through a trunk line after off-hook, the exchange A immediately selects the idle central office trunk of its own exchange. If no idle central office trunk is available, the exchange A sends the request information for originating set through the trunk line which includes the identification number of its exchange and the relevant originating subscriber number to another private branch exchange B. Then the exchange A checks whether the requested central office trunk is busy or not. If a request for reservation is received, the reservation information on the central office trunk is sent to the exchange B. Then the exchange A reserves it own central office trunk and hereafter waits for information on the idle state of its own central office trunk as well as that of the requested exchange B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a trunk queue ink system, and more particularly to a trunk queue ink system in central line transmission of a plurality of private branch exchanges connected by a common line signaling link.

[Conventional technology]

Traditionally, this kind of trunk queue ink method.

This applies only to the central office line output trunk of the private branch exchange to which the subscriber belongs. In other words, when a subscriber requests a central office line call to an exchange, the exchange selects the central office line trunk of its own exchange;
When this central office trunk is busy, subscribers can reserve the central office trunk using additional dialing, etc., and when the central office trunk becomes vacant, the exchange calls the reserved subscriber and The new central office line trunk is used to make central office line calls. On the other hand, a call to a central office line can be made via another private branch exchange, even if the central office line outgoing trunk of this private branch exchange is busy.

The configuration is such that it is not possible to reserve central office line trunks.

[Problem that the invention seeks to solve]

However, with the conventional trunk-queue-ink method described above, multiple private branch exchanges each having a central office line trunk are connected by a common signal link that can transmit a wealth of information, but one central office line cannot be used effectively. There is a problem.

The object of the present invention is to eliminate the above-mentioned problems, and to store information on central line calls from subscribers belonging to other private branch exchanges, thereby making it possible to reserve central line calls from other private branch exchanges. The goal is to provide a method.

[Means for solving problems]

In the trunk queue ink system t'i of the present invention, in each of a plurality of private branch exchanges each having a central office line trunk and connected by one speech line and a common line link, from other private branch exchanges among these private branch exchanges. a selection means for selecting a vacant central office trunk of the local exchange in response to receiving central office line call request information including an identification number of the originating exchange and a subscriber number; Busy notification means that notifies the other private branch exchange that all the calls are busy while holding the request information; Waiting means for processing the request information in the same manner as subscriber information for reserving a central office line trunk; and further, receiving a reservation request for central office line calling from a subscriber after transmitting a busy signal to the subscriber making a central office line call. and reservation information sending means for requesting a reservation to the private branch exchange that requested the central office line call.

In the above configuration, when a station that requests a single-station line call is notified that all calls are busy from the private branch exchange that requested it.

When the calling subscriber is informed that the subscriber is busy and the desired reservation information is obtained, the reservation information is sent to the requested station and the reservation is made, waiting for a 1-station line trunk to become available. Note that this reservation can be made to the own station or to multiple other private branch exchanges, and the requesting station can also make a request to another station, so it is important to decide the priority of the request destinations. This can be done without forming a loop. Furthermore, even if the same reservation is requested via a different private branch exchange, the identification number of the originating exchange and the subscriber number included in the request information prevent a duplicate reservation from being made.

〔Example〕

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

FIG. 1 is a processing flowchart of an embodiment of the present invention. FIG. 2 is a relay system diagram of a plurality of private branch exchanges to which the present invention is applied, each accommodating a plurality of subscribers and a plurality of office lines connected to the public network, and a plurality of call lines between each. private branch exchanges A, B, and C connected by common line signaling links with
is illustrated. FIG. 3 is a layout diagram of one embodiment of the central office line call waiting information set in the storage device of each private branch exchange shown in FIG. , each has the telephone number of the subscriber to be met, the identification number of the private branch exchange to which the subscriber is accessing, and a pointer to the next storage area.

Next, the description of FIG. 1 will be continued with reference to FIGS. 2 and 3. Figure 11a is a flowchart of a processing program when a subscriber at Jri makes a call to the central office line. 1For example, if a subscriber at private branch exchange A dials (for example, dials 101) to make a call to the central office line after going off-hook, f. , the private branch exchange Ari immediately selects a vacant central office trunk of its own exchange (step 2).

If there is no vacant central office line trunk, the request information for the central office line call, including the identification number of the own exchange and the subscriber number of this call, is sent to another predetermined private branch exchange B (step ). Next, it waits to see if the requested central office line trunk is busy (step ■).

Then, when there is a busy notification from the client, a busy signal is sent to the subscriber who made the call (step ■).Next, this subscriber makes a request for a reservation for a meeting (for example, the reservation is displayed by 9 King). After waiting for a certain period of time (step 2), when a reservation request is received, the central office line trunk reservation information is sent to private branch exchange B (step 2). Next, it makes a reservation for its own trunk (step 2), and then waits for notification of vacancies in its own trunks and notification from private branch exchange B, the request destination, of vacancies in its own trunks. If the central office line trunk is interrupted in step (2), the central office line is immediately transmitted in the normal manner (step (2)). Also, in step ■, private branch exchange B
If the push of the central office line trunk is reported from private branch exchange B,
K As before, connect this subscriber and request him to make a central office line call (step ■). Furthermore, if there is no reservation request in step (2), information on canceling the previous central office line call request is sent to private branch exchange B, and recovery is resumed.

In the above embodiment, private branch exchange Arj private branch exchange B
However, it was decided that requests would be made to make calls to the central office only.

Furthermore, there are no restrictions whatsoever even if requests are made to other private branch exchanges. Furthermore, private branch exchange B can also request another private branch exchange to make this central line call.

Figure 1(b) is a flowchart of the processing program when receiving request information for calling a central office line from another private branch exchange.
For example, when private branch exchange B receives request information for calling a central office line from among private branch exchanges, exchange Brj.

Immediately select a vacant central office trunk of your own exchange (step ■). If there is no vacant central office trunk, the request information is put on hold (step 2), and the private branch exchange A is notified that all central office trunks are busy (step 0). Next, wait for reservation information to be sent from private branch exchange A (step [
When the reservation information is received, the subscriber number and the identification number of the private branch exchange A that made the request are taken from the pending request information.

It is stored as the station line call waiting information shown in FIG. This central office line call waiting information is also stored in accordance with the waiting times of subscribers belonging to the own exchange, and a chain is formed by the next pointer in order starting from the earliest one (ST, Tsubu O).
. If a vacant central office line trunk is selected in step (2), the private branch exchange A is notified that there is a vacant central office trunk. Also.

When receiving cancellation information for a central office line call request in step [phase], recovery is performed.

The above-mentioned various information ri is all transmitted and received between private branch exchanges via the existing common line signal link.

〔Effect of the invention〕

As explained above, the present invention accommodates a one-office line trunk,
A waiting means for storing a subscriber number and an identification number of the private branch exchange to which the subscriber belongs in a private branch exchange connected by a common line signal link, and performing connection processing with a vacant office line trunk; By having a means for transmitting and receiving waiting information for central office line trunks via a line signal link, central office line calls can be made while waiting for central office line calls from subscribers belonging to other private branch exchanges, thereby increasing the utilization rate of central office line trunks. This has the effect of reducing the busy rate of single-station line calls.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of processing according to an embodiment of the present invention, FIG. 2 is a relay system diagram of a plurality of private branch exchanges to which the present invention is applied, and FIG. 3 is set in the storage device of the private branch exchange shown in FIG. FIG. 4 is a layout diagram of an example of central office line call waiting information. Rika f diagram and a no

Claims (1)

[Claims] In each of a plurality of private branch exchanges each having a central office line trunk and connected by a speech line and a common line link, request information for a central office line call, including the identification number and subscriber number of the originating exchange, is sent from another private branch exchange. selection means for selecting a vacant central office line trunk based on the request, and busy notification means for notifying the other private branch exchange that all calls are busy while holding the request information when the selecting means cannot find a vacant central office line trunk. and queuing means for receiving central office line trunk reservation information from the other private branch exchange that has informed that all calls are busy and processing the request information in the same manner as subscriber information for reserving the central office line trunk of its own private branch exchange; Reservation information sending means for transmitting a busy signal to a subscriber making a call to the local line, and then requesting a reservation to the private branch exchange that made the request to make the call to the local line when receiving a reservation request for calling the local line from the subscriber. The trunk cue ink method is characterized by: