JPH08317050A - Communication system selecting relay path - Google Patents

Abstract

PURPOSE: To obtain the communication system in which any of plural relay network routes is selected based on the priority. CONSTITUTION: The system is provided with a caller terminal equipment 11 that has a function of designating called terminal equipment information, relay path information representing a communication network through which communication passes, substitute replay path trying succeeding setting when a communication path setting for the relay path is unsuccessful and substitute relay path information representing the trial priority, a caller exchange 21 that has a function of detecting a call signal including information designated by the caller terminal equipment 11 and deciding relay communication networks 31-36 to be connected next, a called exchange 22 that has a function providing a call to the called terminal equipment 12 according to the called terminal equipment information, and the called terminal equipment 12. The caller exchange 21 tries setting of a series of a communication paths represented in the substitute relay path information with priority when the setting of a series of communication paths represented in the relay path information is unsuccessful.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telecommunication switching system having a signaling procedure, and more particularly to a telecommunication system which designates a plurality of relay network routes to a switch when a terminal device makes a call in order of priority.

[0002]

2. Description of the Related Art In the signaling procedure of Q.931 or Q.2931 recommended by ITU-T (formerly CCITT) or the signaling procedure specified by UNI3.0 / 3.1 specified by ATM Forum, The terminal device provides a function of selecting a relay network when making a call, but within the range of this function, the terminal device is only allowed to specify the relay network in the order of relaying. Therefore, even if there are multiple transit networks and multiple transit network routes,
It was not possible to select multiple relay network routes from the terminal device.

For example, when the communication system is configured as shown in FIG. 1, the relay route when the terminal device 11 accommodated in the exchange 21 communicates with the terminal device 12 accommodated in the exchange 22 is: Route through transit networks 31 and 32, transit network 33
There are three routes, a route passing through the route and a route passing through the relay networks 34, 35, and 36, but in the conventional technology, the terminal device can only specify one of these routes to list the relay networks in order. There wasn't. SETUP in this case
The message is as shown in FIG.

FIG. 2 shows S when the route 41 of FIG. 1 is designated.
It is a figure which shows the content of the ETUP message, and is a conventional I
S in the signaling procedure of Q.931 or Q.2931 recommended by TU-T or the signaling procedure specified by UNI3.0 / 3.1 specified by ATM Forum.
Of the ETUP message, only the part relating to the relay network selection is shown.

In this figure, IE1 is a broadband repeat identifier information element, IE2 is a relay network selection information element indicating the first relay network, and IE3 is a relay network selection information element indicating the second relay network. At this time, the contents of IE2, IE3, etc. are determined according to the order of relaying the relay networks on one route.
As described above, conventionally, it has not been possible to specify that a plurality of routes should be prioritized and selected.

Further, the conventional private branch exchange (PBX) has a last cost routing (LCR) function which preferentially uses a network with a low charge depending on the network operator or time zone, but the network selection logic of LCR is generally used. It is common to the terminal devices or tenants that are housed. But,
In recent years, each network operator has come to provide its own discount service, and the selection logic of the network based on the charge is different for each terminal device or each tenant depending on the subscription condition for each terminal device or each tenant. In such a case, if an attempt is made to provide the PBX with the network selection logic for each terminal device or tenant, there is a problem that the amount of data possessed by the PBX increases, and further, data setting becomes complicated and requires a long time. There's a problem.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a communication system configured so that a plurality of relay network routes can be selected in order of priority.

[0008]

In order to solve the above problems, the present invention proposes a signaling procedure of Q.931 or Q.2931 recommended by ITU-T or UNI3 specified by ATM Forum. In the SETUP message in the signaling procedure specified in .0 / 3.1, an information element that specifies multiple relay network routes by prioritizing them is added to the part that selects the relay network route, and this enables multiple relay routes. It has a function of selecting a network route.

That is, according to the present invention, the receiving terminal information indicating the communicating communication terminal device, the one or a plurality of communication networks through which the communication passes, the relay route information indicating the order of passing, and the relay route indicated in the relay route information. If the setting of the communication path is unsuccessful, one or a plurality of alternative relay routes for which setting is further attempted and a function of designating alternative relay route information indicating the priority of the trial, and a calling terminal device A calling exchange that has a relay connection function that detects a calling signal that includes called terminal information, relay route information, and alternative relay route information, and determines the relay communication network to be connected next, and the relay that the calling exchange connects next It comprises a communication network, a destination exchange having a function of receiving an incoming call at the receiving terminal according to the information of the receiving terminal arriving via the relay communication network, and the receiving terminal, the originating exchange being indicated in the relay route information. If the setting of a series of channel is unsuccessful and, characterized in that the setting of a series of communication paths shown in alternate routing information that is configured to attempt according to priority.

Further, according to the present invention, the relay route information and the alternative relay route information include a priority repeat identifier, a broadband repeat identifier and relay communication network information, and the originating exchange has a relay route recognition means and a connection trial means. The relay path recognizing means decodes the priority repeat identifier, the broadband repeat identifier and the relay communication network information to recognize the relay path to be tried next, and the connection trying means recognizes the relay path recognizing means. Connection to the relay route
When the connection is unsuccessful, the relay path recognizing means is restarted to repeat the connection trial, and when there is no relay path to be tried next, the setting of the communication path is stopped.

[0011]

In the present invention, the SETUP from the terminal device
Add a priority repeat identifier information element to the message,
This information element designates a plurality of relay network routes, and when the exchange receives the message, it selects the plurality of relay network routes in order of priority so that the terminal device can select the relay network routes. In this way, since the relay network route can be selected from the terminal device,
The exchange does not need to secure an area for storing the transit network route selection logic for each terminal device, and the procedure for registering data is also unnecessary.

[0012]

Embodiments of the present invention will be described with reference to the drawings. In the communication system shown in FIG.
In order to select the priority, the route 42 as the second priority, and the route 43 as the third priority in order, as shown in FIG. 3, a relay is performed after the priority repeat identifier information element (IE1) in the SETUP message. Repeat the network route in order of priority. The relay network route designates the networks to be relayed in order after the broadband repeat identifier information elements (IE2, IE5, IE7), as in the conventional case.

In order to represent the route 41, a broadband repeat identifier information element (IE2) is followed by a relay network on the route 41.
The relay network selection information element (IE3) indicating 31 and the relay network selection information element (IE4) indicating the relay network 32 are continued. Route 42
To represent a wideband repetition identifier information element (IE
5) is followed by a relay network selection information element (IE6) indicating the relay network 33 on the route 42. To represent Route 43,
After the wideband repetition identifier information element (IE7), the relay network selection information element (IE
8) The relay network selection information element (IE9) indicating the relay network 35 and the relay network selection information element (IE10) indicating the relay network 36 are continued.

Next, the functional configuration of the exchange will be described. The call control function unit of the exchange manages the signaling analysis unit that checks and analyzes the content or procedure of signaling to and from the terminal device or other exchanges, the route to the connection partner, and the availability of resources. A routing processing unit for determining a route for each call and a condition storage unit for each tenant / terminal device that stores and manages service conditions for each tenant or each terminal device accommodated in the exchange are provided.

According to the present invention, since the relay network route is designated from the terminal device with priority, the signaling analysis unit of the exchange must newly have a function of analyzing the information element using the priority repeat identifier. The routing processing unit needs to have a function of confirming whether or not the relay network can be connected in order of priority (details of this function will be described later).

However, according to the present invention, when the priority order of relay network selection is different for each tenant or terminal device, the amount of information to be stored in the condition storage unit for each tenant / terminal device is significantly reduced. Can be done by tenant / per call
Since the process of searching for and referring to the enormous amount of service condition information accumulated in the condition accumulating unit for each terminal device becomes unnecessary, the load of the call control process can be remarkably reduced.
Further, generally, the service conditions for each tenant / terminal device that are stored in the exchange are set through the system administrator, but it is not necessary to set this information on the exchange side, so the period until service start is shortened. It is possible,
At the same time, the load on the system administrator can be reduced.

Next, the routing process of the exchange 21 when receiving the SETUP message in which the relay network route is designated will be described with reference to FIG. The exchange 21 sorts adjacent relay networks in order of priority (Process 1). At this time, the highest priority relay network 31 is a candidate relay network. Next, it is checked whether or not the connection with the candidate relay network is possible (process 2). If connection is possible, call connection processing is performed for the relay network (processing 3). If the connection is impossible, the relay network with the next priority (relay network 33) is set as the candidate relay network (process 4), and the processes from process 2 onward are repeated. If the connection to all the designated transit networks is impossible, the call is disconnected and released (process 5).

[0018]

As described above, according to the present invention,
The terminal device in the communication system can designate a plurality of relay network routes in order of priority, the degree of freedom in selecting the relay network route increases, and the efficiency of the entire communication system can be significantly improved. Further, according to the present invention, since the relay network route selection is designated from the terminal device, the exchange side does not need a data area for holding the relay network route selection information for each terminal device. Since the selection logic can be changed on the terminal device side as well, the procedure for requesting data registration to the exchange is not required, and since there is no waiting time for data setting, the user can receive services quickly. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration example of a communication system.

FIG. 2 is a diagram showing an example of a SETUP message in a conventional system.

FIG. 3 is a diagram showing an example of a SETUP message in the system of the present invention.

FIG. 4 is a flowchart showing a routing process of the exchange when receiving a SETUP message.

[Explanation of symbols]

 11, 12 Terminal device 21, 22 Switch 31, 32, 33, 34, 35, 36 Relay network 41, 42, 43 Relay network route

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tai Tai Ono 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. Receiving terminal information indicating a communicating communication terminal device, one or a plurality of communication networks through which communication is performed and relay route information indicating an order of passage, and communication of a relay route indicated in the relay route information. A calling terminal device having a function of designating one or a plurality of alternative relay routes for which setting of the route is unsuccessful and alternative relay route information indicating the priority of trial, and called terminal information designated by the originating terminal device , A calling exchange having a relay connection function that detects a call signal including the relay route information and the alternative relay route information and determines the relay communication network to be connected next, the relay communication network to which the calling exchange connects next, and relay The destination exchange has a receiving side exchange that has a function of receiving an incoming call at the receiving side terminal device according to the receiving side terminal information that has arrived via the communication network. If the setting is unsuccessful, the communication system capable of selecting a relay route, characterized in that the setting of a series of communication paths shown in alternate routing information that is configured to attempt according to priority. 2. The relay route information and the alternative relay route information include a priority repeat identifier, a broadband repeat identifier and relay communication network information, and the originating exchange comprises a relay path recognizing unit and a connection attempting unit, The relay path recognizing means decodes the priority repeat identifier, the broadband repeat identifier and the relay communication network information, and recognizes the relay path to be tried next, and the connection trying means is the relay recognized by the relay path recognizing means. Try to connect to the route, restart the relay path recognition means if connection is unsuccessful, repeat connection attempt, and stop setting the communication path when there are no relay paths to try next The communication system capable of selecting a relay route according to claim 1, wherein the communication system is configured.