JPH07221788A - Method of selecting trunk line corresponding to calling terminal attribute - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding a packet switching network having a switching device accommodating a plurality of transmitting side terminals and a switching device selecting a plurality of relay lines, a connection with another packet network is selected as a relay line corresponding to a transmitting terminal attribute. The purpose is to do. A packet-switching network 1 having a calling-side exchange 3 that accommodates a plurality of calling-side terminals A and B, and a trunk-line-side switch 4 that selects a plurality of trunks M and N, and a plurality of packet-switching networks 1 In the network having the other packet network 2 which is connected by the trunk lines M and N to select the receiving side terminals X and Y, the originating side exchange 3 is provided with a holding information memory table 5 including terminal information and communication partner information. , A holding information memory table 6 consisting of communication partner information and trunk line selection information is provided in the trunk side exchange 4, and a call request (C
R) In addition to the call identification information and the address information, the terminal attribute information is added to the packet information 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trunk line selecting method in a packet switching network having a switchboard housing a plurality of caller terminals and a switchboard selecting a plurality of trunk lines. In a packet-switched network that has an exchange that accommodates a plurality of subscriber lines that connect terminals and an exchange that accommodates a plurality of trunk lines that connect other exchanges or other networks, from the other party's address specified by the terminal It is possible to determine the trunk line connected to the exchange or another network.

Conventionally, since the other party's address has been used as information for selecting a trunk line, all calls use the same trunk line when communicating with the same destination. However, if there are a plurality of trunk lines even if the partner network / switch is the same, it is possible to divide the use by trunk line.

For example, a dedicated relay line is assigned to an important terminal to improve the connectivity, congestion of the line is avoided, or the terminal is divided into a plurality of groups to correspond to each group. Although a method of allocating a trunk line is also conceivable, it is desired to cope with such a situation even in a packet switching network.

[0004]

2. Description of the Related Art A conventional trunk line selection method in a conventional exchange is shown in FIG. In the figure, 21 is an exchange, 22 is another network, 23 is another exchange, 24 is relay line selection information, 25 is a relay line, 26 is a calling side terminal, and 27 is a receiving side terminal. Switchboard 21
When the originator terminal A accommodated in the dialing station dials the partner address X in order to start communication with the recipient terminal X accommodated in the other network 22, the trunk line selection information 24 of the exchange 21 causes the partner network W to enter the partner network W. The corresponding trunk line M is selected and connected to the called terminal X accommodated in the other network W via the trunk line M.

Since the trunk line corresponding to the trunk network is set in the trunk line selection information 24, the originating terminal B
If the other party's address X is dialed in order to start communication, the relay line M corresponding to the partner's network W is selected and connected to the called terminal X accommodated in another network W via the relay line M. .

FIG. 5 shows a processing flowchart in a conventional exchange. In the figure, (21) When the other party's address X is dialed to start communication from the calling terminal, (22) the other party's address X is analyzed, and (23) it is checked whether the other party's address X is a terminal within the local exchange. If it is determined that the terminal is within the own exchange, the terminal selection processing inside the exchange is performed. (24) If the terminal is not in the own exchange, the trunk line M is selected from the partner network W corresponding to the partner address X by referring to the trunk line selection information. (25) Check if the trunk line selection is OK,
(26) If the trunk line selection is not OK, it is determined that communication is impossible and disconnection is performed. (27) If the trunk line selection is OK, communication with the partner terminal X is started via the selected trunk line M.

[0007]

In an exchange that accommodates a plurality of subscriber lines connecting terminals and a plurality of trunk lines connecting other exchanges or other networks, the other exchanges start from the other party's address specified by the terminal when making a call. Alternatively, when it is determined that the call is connected to another network, in the above conventional method, only the other party's address is used as the information for selecting the trunk line. Therefore, when communicating to the same destination, all calls are the same. Will use the trunk line.

However, if there are a plurality of trunk lines even if the partner network / switch is the same, the use of the trunk line may be divided. For example, a dedicated trunk line may be assigned to important terminals to improve the connectivity. It is possible to improve, to avoid congestion of the line, or to divide the terminal into a plurality of groups and assign a trunk line to each group, but the conventional method cannot cope with such a situation. It is possible.

According to the present invention, in a packet switching network having an exchange that accommodates a plurality of terminals on the originating side and an exchange that selects a plurality of trunk lines, attributes are defined for the terminals on the originating side and trunk lines are selected. By having the information of the trunk line to be used corresponding to the combination of the communication partner address and the attribute of the calling terminal as the reference information for
The purpose is to divide the terminal on the calling side into a plurality of groups and use different trunk lines for the same destination for the same destination.

[0010]

FIG. 1 is a block diagram showing the principle of the present invention. In the figure, 1 is a packet switching network, 2 is another packet network, 3 is an originating exchange,
Reference numeral 4 is a trunk side exchange, 5 is a memory table of information held by the exchange 3, 6 is a memory information table held by the exchange 4, and 7 is call request (CR) packet information. Terminals A and B indicate calling side terminals, and terminals X and Y indicate receiving side terminals. Further, the relay line M and the relay line N indicate relay lines between networks.

The memory table 5 of the information held by the exchange 3 is
The exchange 4 holding information memory table 6 includes communication partner information and trunk line selection information, and the call request packet information 7 includes call identification information, address information, and terminal attribute information. Become. The terminal attribute information is information added to the packet in the present invention.

[0012]

2 is a processing flowchart of the originating side exchange 3 and the trunk line side exchange 4 of the present invention. 2A shows a processing flow of the originating side exchange, and FIG. 2B shows a processing flow of the trunk line side exchange.

In the processing flow of the originating exchange of FIG. 2A, (1) a call request (CR) is received from the originating terminal and communication is started. (2) Analyze the other party's address and retrieve the communication partner's information from the upper digits of the other party's address. (3) It is checked whether the other party's address belongs to the terminal in the own exchange, and if it is the terminal in the own exchange, the terminal selection process inside the exchange is performed. (Search in another table) (4) If the other party's address does not belong to the terminal in the local exchange,
The terminal attributes are extracted from the terminal information. (5) A CR packet is created by adding the terminal attribute of the terminal information, and the CR packet is transmitted to the trunk side exchange and is called to the partner exchange.

In the processing flow of the trunk side exchange shown in FIG. 2B, (11) a call request (CR) is received from the originating exchange and communication is started. (12) Analyze the other party's address, and search the communication partner information from the upper digits of the other party's address. (13) It is checked whether or not it is a terminal in another network, and if it is not a terminal in another network, terminal selection processing in its own network is performed. (Search in another table) (14) If the terminal is in another network, extract the attributes of the originating terminal set in the CR packet, and (15) select trunk line information based on the destination address and terminal attribute. To determine the trunk line corresponding to the terminal address and terminal attribute. (16) It is checked whether the selected trunk line is OK for use, and if it is not OK, another trunk line is selected or the call is disconnected. (17) If it is OK to use, start communication on the selected trunk line,
A CR packet that does not include the terminal attribute is created and transmitted to another packet network.

[0015]

FIG. 3 shows an example of the processing image of the present invention. In the figure, 11 is a packet switching network, 12 is another packet network, 13 is an originating exchange, 14 is a trunk exchange, 15 is a memory table of information held by the exchange 13,
Reference numeral 16 is a memory information table held by the exchange 14, and 17 is call request (CR) packet information. Terminals A and B indicate calling side terminals, and terminals X and Y indicate receiving side terminals. Further, the relay line M and the relay line N indicate relay lines between networks.

The originating terminal A has its own address 987-9999 and the attribute i, the originating terminal B has its own address 987-8899 and the attribute j, and the called terminal X has the calling party terminal A's partner address 123-0000 and the called side. The terminal Y is the other party's address 123-1111 of the originating terminal B. Therefore, the address of the packet switching network 11 is
987, the address of the other packet network 12 is 123.

In the memory table 15 of the exchange 13 holding information, the attribute i, 987-8899 for 987-9999 is stored as the terminal information.
Is set to the attribute j, and the communication partner information is accommodated by the own node for 987 and trunk switch 14 for 123.
Is set. Further, in the memory table 16 of the information held by the exchange 14, other network accommodation information is set for 987 as the communication partner information, and as the trunk line selection information, the trunk line M and the attribute j for the attribute i for the partner 987 are set. Is set to the relay line N.

In the call request (CR) packet information 17, a logical channel or the like is set as the call identification information, and the other party address 123-1111 is set as the address information. These are standard provisions such as CCITT recommendations. The attribute information i, j, etc. is new addition information and has no standard provision.

As a concrete image of the terminal attribute assigning method, in the above-mentioned processing image, a case is shown in which a terminal on the calling side is held in advance as a table on a memory. Although other methods can be considered for this giving method,
Hereinafter, the assigning method and the table on the memory of the originating exchange 13 will be described in association with each other. It is registered in advance as a terminal attribute corresponding to the terminal. As described above. Register in advance the attributes to be given to the unit (eg, the upper several digits) in which the terminal address is classified according to a specific rule,
It is automatically assigned according to the address when registering the terminal.

For example, in the table as the information held by the exchange 13, the upper 5 digits of the address, the attribute i for 987-99,
Attribute j is set for 987-88. As an example of a processing image, for example, when calling from the terminal A, the calling terminal address 987-99
The attribute i is set in the table for 99 and the attribute j is set in the table for the calling terminal address 987-8899 when the terminal B originates. Attributes to be given corresponding to various services provided by the network to the terminal are registered in advance, and are automatically given according to the service at the time of terminal registration or transmission.

For example, an attribute is set in the table as the information held by the exchange 13 in correspondence with the usage status subscription to the service A. As an example of a processing image, for example, when a request is made from the terminal A for the service X in the CR packet, the attribute i is added from the table. Is given.

When the service X is not requested by the CR packet when the call is sent from the terminal A, the attribute j is added from the table. (With this method, it is possible to change attributes even with the same terminal depending on whether there is a request at the time of calling)

[0023]

In the conventional trunk line selection method, when communicating with the same partner network / switch, the same trunk line is selected regardless of the calling terminal. By adopting the method of the present invention, it becomes possible to select different trunk lines for the same destination according to the attributes of the calling terminal, and the trunk lines can be used flexibly.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a processing flowchart of the present invention.

FIG. 3 is an example of a processing image of the present invention.

FIG. 4 is a trunk line selection method in a conventional exchange.

FIG. 5 is a processing flowchart of a conventional exchange.

[Explanation of symbols]

 1,11 Packet switching network 2,12 Other packet network 3,13 Calling side switch 4,14 Trunk line side switch 5,15 Calling side switch holding information memory table 6,16 Trunk line side holding information memory table 7, 17 Call request (CR) packet information 21 Switch 22 Other network 23 Other switch 24 Trunk line selection information 25 Trunk line 26 Caller terminal 27 Callee terminal

Claims (3)

[Claims] 1. A packet switching network (1) having a calling side exchange (3) accommodating a plurality of calling side terminals A and B, and a trunk side exchange (4) selecting a plurality of trunk lines M and N. , A packet switching network (1) connected to the packet switching network (1) by a plurality of trunk lines M and N, and another packet network (2) for selecting the receiving side terminals X and Y. A holding information memory table 5 made up of information and communication partner information is provided, and a holding information memory table (6) made up of communication partner information and trunk line selection information is provided in the trunk line side exchange (4), and the originating side exchange ( 3) The call request (CR) packet information (7) sent from 3) is added with the terminal identification information in addition to the call identification information and the address information, and the attributes are defined for the terminal on the calling side and the trunk line is selected. By having the information of the trunk line that should be used in correspondence with the combination of the communication partner address and the attribute of the calling terminal as the reference information to analyze, the address specified as the communication partner is analyzed in response to the communication start request from the terminal. Then, when it is determined that the terminal belongs to another network, the trunk line corresponding to the partner address and the attribute of the calling terminal is selected to start communication, and the trunk line corresponding to the sending terminal attribute is selected. Method. 2. The network has a function of holding a plurality of relay lines for a combination of a determination result of a switching device accommodating a communication partner terminal and an attribute of the terminal, and performing a detour when a line failure occurs or the like. The trunk line selection method according to claim 1, wherein the trunk line selection method corresponds to the calling terminal attribute. 3. In the above network, the attribute of a terminal is not registered individually, and the attribute is given by a predetermined method corresponding to the address or line number given to the terminal to determine the exchange that accommodates the communication partner terminal. The trunk line selection method according to claim 1, wherein a trunk line is held for a combination of a result and a terminal function obtained from this address or line number.