JPH04132395A - Route selection system - Google Patents

Abstract

PURPOSE:To efficiently utilize switching network by checking the free/busy state of a route between exchanges, selecting the optimal route, preliminarily reserving a trunk so that the route can not be used for an another call, and selecting the route according to the, reserved information. CONSTITUTION:Number programing information for route information, trunk information, and route selection is inputted to a computer system 9, and stored. Then, when a switchboard C receives the subscriber's number at an incoming call side from a switchboard A, the switchboard C transmits the information through a digital transmitter 11 to the computer system 9. Moreover, the computer system 9 extracts one trunk information among a route (b) which is preliminarily reserved, and transmits the information to a switchboard C. Thus, the switchboard can be efficiently used, and can be effectively utilized for a trunk management between the exchanges.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a route selection method in an exchange.

[Conventional technology]

Conventionally, route selection in exchanges uses a translator installed in the originating station that converts called party information into route information, and selects a direct route or a route to a relay station among the routes leading to the terminating station where the called party is accommodated. Receiving route information and making route selection.

[Problem to be solved by the invention]

As mentioned above, in conventional route selection, routes are selected based on the free/busy information of routes directly connected to the originating station. Since the idle/busy status of the route to the station is not known, it may not be possible to connect the call to the intended destination station, and it may be inconvenient to grasp inter-office traffic in the switching network.

SUMMARY OF THE INVENTION An object of the present invention is to provide a route selection method that can efficiently use a switching network and effectively manage traffic between switching stations.

[Means to solve the problem]

The route selection method of the present invention is a route selection method that selects a route between exchanges in a switching network composed of a plurality of exchanges, based on information from the exchange, whether the route between the exchanges is idle or busy. When an inquiry signal is received, the idle/busy state of the corresponding route of the direct route from the originating station to the terminating station and the route from the originating station to the terminating station via a relay station is output, and the above-mentioned If the corresponding route is vacant, processing means is provided for reserving the shortest corresponding route according to the subscriber information so that it is not selected from other calls, and the originating station and the relay station perform route selection. When performing, refer to the processing means,
The configuration is such that route information of the reserved line is received among the routes from the originating station to the terminating station where the called party is accommodated, and the corresponding route is selected.

〔Example〕

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

FIG. 1 is a block diagram of a system for explaining one embodiment of the present invention. In FIG. 1, the program-controlled switching system includes a line circuit 1 accommodating a subscriber 8, trunks 2a to 2C connecting with opposite stations, a register sender trunk 3 receiving dialing information from a caller, and a line circuit 1 accommodating a subscriber 8. The computer system includes a time division switch 4, a central processing unit 5, a main memory 6, and an input/output (Ilo) interface 7 that interfaces with the computer system.

Computer system 9 with computer terminal 10
is connected to the exchange via the I10 interface 7,
It is connected to other exchanges via a digital transmission device 11.

FIG. 1 is a diagram showing an example of a switching network for explaining an embodiment of the present invention. Among the plurality of routes provided by three exchanges A to C, the routes between exchanges A and B are route a, route a,
Route c connects exchanges A and C, and route b connects exchanges C and B.

The operation will be explained below. First, a maintainer of the computer system 9 sends route information such as route numbers between each exchange A to C, trunk information such as trunk numbers, and numbering plan information for route selection from the computer terminal 10 to the computer system 9 in advance. Enter and store.

Next, when the subscriber 8 makes a call and captures the trunk 2a, the central processing unit 5 generates the information that the subscriber 8 captured the trunk 2a together with the station identification information of the own station and the called party number, that is, The calling party number and trunk number are sent to the computer system 9 via the I10 interface 7. Also, when a tandem connection is made from an incoming call from trunk 2b to trunk 2C, the station identification information of the own station and the trunk 2
tandem connection information from b to trunk 2C is sent to computer system 9 via I10 interface 7. As a result, the computer system 9 stores trunk idle/busy information for each route between each station.

Next, a case will be described in which subscriber 8 connected to exchange A is connected to a subscriber (not shown) accommodated in exchange B.

Subscriber 8 makes a call, is connected to register sender trunk 3, and after confirming the dial tone, exchanges w! When the IB subscriber number is dialed, the central processing unit 5 refers to the main storage device 6 based on the subscriber number received from the register sender trunk 3, identifies the call as being to another station, and dials the I10 interface 7.
This subscriber number is sent to computer system 9 via. The computer system 9 checks whether the shortest route between the exchange A and the exchange IIB, for example, the direct route a, is free from this information, and if it is free, the computer system 9 sends this route information to the central processing unit via the I10 interface 7. In addition to transmitting the call to W5, one trunk in this route is reserved and stored so that it will not be selected by other calls. As a result, the central processing unit 5 connects the subscriber 8 and the trunk 2.
a, and send a connection completion signal to the computer system 9.
Send to. Computer system 9 receives this signal and stores trunk 2a as busy. If route a is busy, computer system 9:
Checks whether routes c and b, which are the next shortest route to exchange B, are free and busy, and if they are free, the central processing unit 5
Send information about Herut C. At this time, the computer system 9 uses the calling party number to use one trunk each of routes c and b for tandem connection to the exchange B.

The central processing unit 5 then connects the subscriber 8 with the trunk 2C belonging to the route C and transmits this information to the computer system 9 as well.

Next, when exchange C receives the subscriber number of the called party from exchange A, it transmits this information to computer system 9 via digital transmission device 111. Computer system 9 thereby extracts information on one trunk in route b, which has been reserved in advance, and transmits this information to exchange C. Then, exchange C has route c,
The optimal route can be selected as described above by connecting each reserved trunk in b in tandem and transmitting this information to the computer system 9.

When the information related to route selection is changed due to the addition of a new station to the switching network or a line change, the maintainer of the computer system 9 inputs the changed information from the computer terminal 10.

Since the computer system 9 stores the usage status of each route between exchanges A to C, by inputting a predetermined command from the computer terminal 10,
It is possible to output the traffic status between each exchange, which can be used for maintenance management.

〔Effect of the invention〕

As explained above, when a call is made, the present invention checks the busy status of the route between exchanges from the originating station to the terminating station, selects the optimal route, and blocks the trunk in advance to prevent it from being used for other calls. Since a reservation is made and a route is selected according to the reservation information, the switching network can be used efficiently and can be effectively utilized for traffic management between switching offices.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a system for explaining an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a switching network for explaining an embodiment of the present invention. 1...Line circuit, 2a-2c...Trunk, 3...Register sender trunk, 4.
... Time division switch, 5 ... Central processing unit, 6 ... Main storage device, 7 ... I10
Interface, 8...Subscriber, 9...
・Computer system, 10 river computer terminal, 1
1...Digital transmission equipment, A to C...
·switch.

Claims (1)

[Scope of Claims] In a route selection method for selecting a route between exchanges in a switching network constituted by a plurality of exchanges, an idle busy state of a route between exchanges is stored based on information from the exchange. When an inquiry signal is received, it outputs the idle busy state of the corresponding route among the route directly from the originating station to the terminating station and the route from the originating station to the terminating station via a relay station, and also outputs the idle busy state of the corresponding route. If the route is vacant, processing means is provided to reserve the shortest corresponding route in accordance with the subscriber information so that it is not selected from other calls, and the originating station and the relay station select the route. Sometimes, with reference to the processing means, route information of the reserved line among the routes from the originating station to the terminating station where the called party is accommodated is received, and the corresponding route is selected. route selection method.