JPH08149229A - Line connection control method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a line connection control method by which a caller can always connect to an optimum access point that minimizes communication costs. [Structure] A first APR built in or attached to a private branch exchange requests the location information of a calling terminal to a SCP of a public network, and the SCP notifies the location information of the calling terminal to the first APR. , The first APR compares the position information of the originating terminal and the terminating terminal and determines the access point with the lowest communication cost.
When not connected to a private branch exchange having a PR, the above S
The CP is instructed to change the connection destination and the connection destination, and the SCP
A call connection request is made to the private branch exchange under the instructed access point, and the second A under the access point is instructed.
The PR is a line connection control method characterized by connecting to a receiving terminal by a private branch exchange under the access point, or vice versa.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line connection control method, and more particularly to a line interconnection control method between a public network and a private network.

[0002]

2. Description of the Related Art FIG. 1 shows a basic configuration example of interconnection between a public network and a private network. Regarding this, for example, the descriptions of the 2nd unit and the 4th unit of "Basics of Telecommunications System" edited by Nippon Telegraph and Telephone Corporation (NTT Learning Systems, first edition, published in 1987) can be referred to. In FIG. 1, reference numeral 1 indicates a public network. Here, the public network used in the present invention refers to a telecommunications network that accommodates wired terminals and wireless terminals including PBX and mutually connects them. Switch A of 2
.. D connect terminals in the public network area or PBX in the private network area to the public trunk line to realize mutual connection of terminals. Public network areas A and B of 3 are areas where the exchanges A and B provide public communication services, respectively. Further, 4 indicates a PBX, 5 indicates an internal network area accommodated in the PBX 4, and internal network areas C and D are
PBX-C and PBX-D are areas that provide private communication services, respectively.

Reference numeral 6 denotes a terminal. The terminals a and b may be connected to the exchanges A and B by wire or wirelessly. In the case of wireless connection, when carrying a wireless terminal and moving to another public area, it is possible to connect to an exchange in that area. Terminals c and d also
There are cases where they are connected to the PBX-C and PBX-D by wire, and cases where they are connected wirelessly. In the case of wireless connection, when carrying a wireless terminal and moving to another local network area, it is also possible to connect to the PBX in that area. 7 is an access point for the public network and the local network,
It is the connection point between the exchange and the PBX. Denoted at 8 is a dedicated line for interconnecting the internal networks, which is provided between the PBX-C and PBX-D. The private network 9 is a network in which a plurality of private networks are connected by the dedicated line 8 and has a plurality of access pointers.

[0004] 10 is an SCP (service control point: Se
rvice Control Point) controls the exchanges in real time. The SCP is being standardized by the ITU as described in, for example, Chapter 1 of Part 1 of "Overview of Information and Communication Networks" (Nikkei BP, 1992) supervised by Tadao Saito. It is one of the components of the intelligent network. Further, 11 indicates a communication path, and 12 indicates a public relay line network. For convenience of explanation, the above-mentioned exchanges 2 to access points 7 will be denoted by symbols such as A, B, ...
Making a distinction. Further, the relay distance between the exchange A and the exchange D is longer than the distance between the exchange A and the exchange C, and similarly, the relay distance between the exchange B and the exchange C is longer than the distance between the exchange B and the exchange D. I shall. Also, the communication cost of the public network increases in proportion to the relay distance between the exchanges. The operation in the conventional interconnection configuration between the public network and the private network having the above-described configuration will be described below in different cases.

(1) Private network call reception 1) Connection without using a dedicated line: When a terminal a belonging to the public network wants to receive a call to a terminal d belonging to the private network, the caller of the terminal a calls the terminal d. When dialing the dial-in number, the exchange A, the exchange D of the public network and the P of the private network
By the operation of the BX, the terminal a and the terminal d are connected via the access point D along the route shown in FIG. 2, and the communication is started. 2) Connection using dedicated line: On the other hand, PBX-C and PBX
When the terminal a belonging to the public network wants to receive a call from the terminal a belonging to the public network to the terminal d belonging to the local network by using the leased line provided between -D, the caller of the terminal a first accepts the PBX-C. The operator on the table is called, and the operator is informed of the extension number of the terminal d. The operator performs an operation of connecting to the terminal d belonging to the PBX-D via the leased line, so that the terminals a and d are connected via the access point C through the route shown in FIG. 3, and the communication is started. It

[0006] The above-mentioned operation of the operator can be automatically connected by using the second dial tone of the PBX without the need for manual operation. 3) Comparison of communication costs: The communication costs related to the leased line are
Assumed to be borne by the owner of the private net. At this time,
Comparing the communication costs of the caller of terminal a between the connection that does not use the leased line and the connection that uses the leased line, the connection that uses the leased line is better because the distance to use the public trunk line becomes shorter. Small communication cost. (2) Private network transmission 1) Connection without using a leased line: When the terminal d belonging to the local network wants to make a call to the terminal a belonging to the public network, the originator of the terminal d calls the PBX-D on the public network. After giving an instruction to connect to the terminal a, the number of the terminal a is dialed, and the operation of the exchanges D and A of the public network causes the terminals d and a to
Connection is established via the access point D via the route shown in FIG. 4, and communication is started.

2) Connection using a dedicated line: On the other hand, PBX
Using the dedicated line provided between -C and PBX-D,
To make an incoming call from the terminal d belonging to the local network to the terminal a belonging to the public network, the caller of the terminal d first sends the PBX-
Instruct D to connect to the dedicated line, and
After instructing the PBX-C to connect to the public network, the number of the terminal a is dialed, and the operations of the exchange C and the exchange A of the public network cause the terminals d and a to be shown in FIG. The route is connected via the access point C and communication is started. 3) Comparison of communication costs: It is assumed that private line owners bear a lower communication cost per line than private networks at the same relay distance. At this time, comparing the communication costs of the private network owner between the connection that does not use the leased line and the connection that uses the leased line, the connection using the leased line is better because the distance to use the public network becomes shorter. Small communication cost.

[0008]

The above-mentioned prior art has the following problems. 1) Current problems in receiving private network calls: When making a call from a terminal that belongs to the public network to a terminal that belongs to the private network connected by a leased line, in order to minimize the communication cost of the caller, From the point of view, you can make a call aiming at the nearest access point provided in the private network. For example,
When a terminal d belonging to the private network wants to receive a call from the terminal a in the public network area A, it enters the private network via the access point C. Further, when the call is made from the terminal b in the public network area B, the call may be made via the access point D to enter the local network. However, in order to realize the above-mentioned connection, the caller enters the local network via the access point closest to the caller, so the caller has multiple access points in the private network to which the called terminal belongs. And, it is a condition that they know their representative numbers.

That is, if the caller does not move and makes a call only from a terminal installed in a specific place, the representative number of the local network connected to the nearest access point from that terminal must be known. I have to. In addition, the terminal that the caller moves to and is installed at any place (for example,
When making a call from a public telephone, or when the caller carries a wireless terminal and moves to another place, the nearest access point changes depending on the position of the caller. In this case, it is necessary to prepare a representative number list under the nearest access point for each area to be moved, and the management of the list becomes complicated as the number of access points increases. In addition, access points may be newly installed or removed due to the private network. In order to cope with such a change, it is necessary to constantly update the representative number list under all access points.

2) Current problems in private network transmission:
When making a call from a terminal belonging to the private network connected to the private network to a terminal belonging to the public network, in order to minimize the communication cost for the owner of the private network, it is necessary to use multiple access points of the private network. You can select the one closest to the called party from among them and connect to the public network via this. For example,
When the terminal d belonging to the private network wants to make a call to the terminal a belonging to the public network, it connects to the public network via the access point C. Further, when making a call to the terminal b belonging to the public network, the connection may be made to the public network via the access point D. In this case, the dedicated line is not used. When the called terminals a and b are fixed terminals, it is possible to select the optimum access point with the smallest communication cost, judging from the area code of the public network area to which the called terminals belong.

However, when the called terminal is a wireless terminal that moves in the public network area, the caller who belongs to the private network may not know to which area the called wireless terminal belongs. When making a call from a terminal d belonging to a private network having a plurality of access points to a wireless terminal a belonging to a public network, if the caller of the terminal d knows the location of the wireless terminal a, the destination is a fixed terminal. Since they can be regarded as equivalent, the optimum access point with the smallest communication cost can be selected. However, when the caller of the terminal d does not know the location of the wireless terminal a, it is not possible to select the optimum access point. Can not. Also, when the public network side provides not only terminal mobility (terminal movement) but also personal mobility (people movement) that follows a wireless / wired terminal for movement of people, the location of the called If you don't know, you can't choose the best access point.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems in the prior art and to provide an originator with an optimum access point that minimizes the communication cost. It is to provide a line connection control method that enables constant connection. More specifically,
When originating from the public network side, it is possible to select the access point closest to the originating public network side terminal on the incoming private network side, and when originating from the private network side, the private network side access point closest to the receiving public network side terminal. It is to provide a line connection control method that enables selection.

[0013]

The above object of the present invention is to provide a first access point routing which is built in or externally attached to a private branch exchange which has received a call connection request in a line connection method for receiving a call from a public network to a private network. System (hereinafter referred to as "A
(“PR”) requests the location information of the calling terminal to the SCP of the public network, the SCP notifies the location information of the calling terminal to the first APR, and the first APR communicates with the calling terminal. If the access point that minimizes the communication cost is determined by comparing the location information of the receiving terminal and the access point is not connected to the private branch exchange having the first APR, the connection destination is changed and the connection is made to the SCP. Instructing the destination, the SCP makes a call connection request to the private branch exchange under the instructed access point, indicating that the call connection is instructed from the private network, and sends the second APR under the access point. Confirms the content of the call connection request, and connects to the receiving terminal by the private branch exchange under the access point, or the method of transmitting from the private network to the public network In the line connection method, the first APR built in or attached to the private branch exchange is S of the public network.
The CP requests the location information of the terminating terminal, the service control point notifies the location information of the terminating terminal to the first APR, and the first APR compares the location information of the originating terminal and the terminating terminal. However, the access point with the minimum communication cost is determined, and if there is no private branch exchange that accommodates the originating terminal under the access point, the private branch exchange that accommodates the originating terminal is This is achieved by a line connection control method characterized by instructing to connect to a public network via a private branch exchange, and connecting from the private branch exchange under the access point to the public network.

[0014]

In the line connection control method according to the present invention, when a public network side connects a line to a private network having a plurality of access points, the connection is made via the access point closest to the originating public network side terminal. In addition, when the private network side having a plurality of access points connects to the public network, the connection can be made via the private network side access point closest to the receiving public network side terminal. Since the caller can always connect the access point that minimizes the communication cost, it is possible to reduce the communication charge for the relay line on the public network side. In particular, the effect is great when the called side is a mobile terminal or a person moves and registers a number in the terminal.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 6 shows the basic configuration of the present invention. In the figure,
Reference numerals 1 to 12 indicate the same constituent elements as shown in FIG. Reference numeral 13 is an APR (Access Point Routing System) which is built in or externally attached to each PBX of the private network. The APR obtains the location information and number information of the originating and terminating terminals on the public network side from the above-mentioned SCP, gives the SCP routing information that minimizes the communication cost, and instructs the SCP to change (reroute) the connection destination. As a preliminary preparation for carrying out the line connection control method according to the present invention, it is necessary to register the location of the wireless terminal existing in the private network. FIG. 7 shows an example of registration of location information of wireless terminals located in the private network. The location information is registered in all the APRs in the private network after being registered in the APR of the area to which the terminal belongs, and sent to the SCP. On the other hand, for the location information and number information of fixed terminals, all APRs have registered all terminals in the private network. Also,
Position (area) information of each PBX and each access point, position (area) information of the public network, and charge information are registered in the APR.

FIG. 8 shows a flow chart in the case of an incoming call to the private network, and FIG. 9 shows a concrete example of the terminal a belonging to the public network.
3 schematically shows the flow of the operation for making a call from the terminal to the terminal d belonging to the local network. The broken line in FIG. 9 indicates the flow of control signals, and the thick solid line indicates the flow of line connection. Hereinafter, the operation in the case of an incoming call to the private network will be described in detail with reference to both figures. Also, in the description of the operation, the numbers enclosed in parentheses correspond to the numbers enclosed in the same circle in FIG. Step 21 (): When the terminal a belonging to the public network wants to make a call to the terminal d belonging to the private network, the caller of the terminal a dials the number of the terminal d. This signal is sent to the SCP. Step 22: The SCP, which has received the number information of the terminal a and the number information of the terminal d, selects the receiving terminal d from its own DB.
Search for location information. Step 23 (): The SCP sends a call connection request by the function of the network according to the search result. Step 24: Here, it is determined whether or not the called terminal is in the public network, and if the called terminal is in the public network, the exchange of the public network is operated to connect (step 25).

Step 26: If the APR does not exist in the private network, the PBX function connects to the called terminal (step 34). Step 27 (): As a result of the judgment in Steps 24 and 26,
When the called terminal is in the private network having APR, the call connection request is passed to the APR (here, APR-D), and A
PR-D requests the location information of the caller from SCP. Step 28 (): The SCP receives it and notifies the APR-D of the caller location information. Step 29: APR-D compares the position information of the receiving terminal d and the position information of the transmitting terminal a and finds the optimum access point that minimizes the communication cost from its own DB.
(Here, the access point C is obtained). Step 30: If the optimum access point obtained in Step 29 is connected to the PBX that received the call connection request, the APR-D activates the PBX under the control of this access point to make it the receiving terminal. Connect (Step 3
Four).

Step 31 (): Also, the optimum access point obtained in Step 29 receives the call connection request from P.
If not connected to the BX, the APR-D instructs the SCP to change the connection destination to the corresponding optimum access point. Here, the access point D is designated as the connection destination. Step 32 (): SCP instructed to access point
Reissues the call connection request to the APR (here, APR-C) under the control of the corresponding access point. In this case, SCP is the call connection request instructed by the private network.
Notify by adding that it is a (rerouting call). Step 33 (): The APR-C confirms that the received call connection request is a call connection request (rerouting call) instructed from the private network, and then, by the function of the PBX-C and PBX-D, the receiving terminal Connect to d (step 34). According to this embodiment, the transmitting terminal a
From the exchange A, the exchange C, the PBX-C, and the PBX-D to the incoming terminal d.

Next, the operation for originating a private network will be described. FIG. 10 is a flow chart in the case of originating a private network, and FIG. 11 schematically shows the flow of an operation for making a call from the terminal d belonging to the private network to the terminal a belonging to the public network. As in FIG. 9, the broken line in FIG. 11 indicates the flow of control signals, and the thick solid line indicates the flow of line connection. Hereinafter, the operation in the case of an incoming call to the private network will be described in detail with reference to both figures. Also, in the description of the operation, the numbers enclosed in circles in parentheses correspond to the numbers enclosed in circles in FIG. Step 41 (): When the terminal d belonging to the local network wants to make a call to the terminal a belonging to the public network, the caller of the terminal d dials the number of the terminal a. Step 42: The APR-D accommodating the terminal d determines whether or not the called terminal a is present in the private network by searching its own DB. Step 43: Here, if the called terminal a is in the private network, the PBX function connects to the called terminal a (step 45).

Step 44 (): Here, since the called terminal a is not located in the private network, the APR-D then sends the SC
Request the location information of the receiving terminal a from P. Step 46 (): The SCP accordingly notifies the APR-D of the position information of the receiving terminal a. Step 47: The APR-D compares the position information of the calling terminal d and the position information of the called terminal a and finds the optimum access point that minimizes the communication cost from its own DB.
(Here, the access point C is obtained). Step 48: The APR-D determines whether or not there is a PBX accommodating the calling terminal d under the control of the optimum access point C obtained in step 47. Step 50: Here, if the PBX accommodating the calling terminal is under the control of the optimum access point obtained in step 47, the PB under the control of this access point
By the function of X, the PBX under the optimum access point connects to the public network and connects to the receiving terminal (step 51).

Step 49: Here, since the PBX accommodating the calling terminal d is not under the control of the optimum access point C obtained in step 47, the APR-D sets the PBX.
-Instructs D to connect to the public network via PBX-C. Step 50: Based on this, PBX-D, PBX-C
With the function of, the public network is connected via the optimum access point C. Step 51: Next, the function of the public network is used to connect to the receiving terminal a. According to the present embodiment, by the operation as described above,
From the calling terminal d, PBX-D, PBX-C, exchange C,
The call is received by the receiving terminal a via the exchange A. In addition, the above embodiment shows an example of the present invention,
It goes without saying that the present invention should not be limited to this. For example, in the above embodiment, the distributed control method in which each APR has its own private network information and controls independently is shown. This is the case.

As another configuration method, the main AP
R (“APR-M”) has private network information and other A
The line connection control method according to the present invention can also be realized by a centralized control system that controls PR (referred to as "APR-S") as a secondary position. In this case, the difference from the above-mentioned distributed control method is that (1) APR-S collects all information,
There is an advantage that the DB of can be reduced. (2) Since location registration can be concentrated on APR-M, there is an advantage that a single communication path for control information with SCP can be provided.
At the same time, (3) the operation of APR-S requires control from APR-M, so the amount of communication in the private network increases. (4) When the APR-M fails, the entire system will not function. There is a downside.

[0023]

As described above in detail, according to the present invention, it is possible to realize a line connection control method in which a caller can always connect to an optimum access point that minimizes communication cost. It is effective. More specifically, when originating from the public network side, the access point closest to the originating public network side terminal on the incoming private network side can be selected, and when originating from the private network side, the incoming public network side terminal can be selected. This has a practical effect of realizing a line connection control method that enables selection of access points on the private network side.

[Brief description of drawings]

FIG. 1 is a diagram showing a conventional basic configuration example of interconnection between a public network and a private network.

FIG. 2 is a diagram showing a connection example in which a dedicated line is not used when a private network receives an incoming call in the conventional technique shown in FIG.

FIG. 3 is a diagram showing a connection example in which a private line is used when an incoming call is made to a private network in the conventional technique shown in FIG.

FIG. 4 is a diagram showing a connection example in which a private line is not used when transmitting a private network in the conventional technique shown in FIG.

FIG. 5 is a diagram showing a connection example in which a private line is used when transmitting from a private network in the conventional technique shown in FIG.

FIG. 6 is a diagram showing a basic configuration example of interconnection between a public network and a private network according to an embodiment of the present invention.

FIG. 7 is a diagram showing an example of registration of location information of terminals in a private network in an embodiment.

FIG. 8 is a flowchart of a line connection method for private network termination in the embodiment.

9 is a specific operation explanatory diagram of the line connection method shown in FIG.

FIG. 10 is a flowchart of a line connection method of private network transmission in an embodiment.

FIG. 11 is a diagram explaining a specific operation of the line connection system shown in FIG.

[Explanation of symbols]

1 Public Network 2 Switch 3 Public Network Area 4 PBX 5 Private Network Area 6 Terminal 7 Access Point 8 Leased Line 9 Private Network 10 SCP (Service Control Point: Service Control Point)
Point) 11 Communication path 12 Public relay line network

Claims (2)

[Claims] 1. In a line connection method for receiving a call from a public network to a private network, a first access point routing system (APR) built in or externally attached to a private branch exchange which receives a call connection request is a service control of the public network. Point (S
CP), requesting the location information of the calling terminal,
P notifies the first APR of the position information of the calling terminal, and the first APR compares the position information of the calling terminal and the called terminal to determine the access point with the minimum communication cost, If the point is not connected to the private branch exchange having the first APR, it instructs the SCP to change the connection destination and the connection destination, and the SCP sends the private branch exchange to the private branch exchange under the instructed access point to the private network. The second APR under the access point confirms the contents of the call connection request, and connects to the receiving terminal by the private branch exchange under the access point. A line connection control method comprising: 2. A line connection method for making a call from a private network to a public network, which is built-in or externally attached to a private branch exchange.
The APR requests the location information of the called terminal from the SCP of the public network, and the service control point uses the first AP.
R is notified of the location information of the receiving terminal, and the first APR
The location information of the calling terminal and the receiving terminal is compared to determine the access point with the lowest communication cost. If there is no private branch exchange that accommodates the calling terminal under the access point, the premises that accommodates the calling terminal For exchanges,
A line connection control method comprising instructing to connect to a public network via a private branch exchange under the access point, and connecting from the private branch exchange under the access point to a public network.