JP3899100B2 - VoIP service system, call control server, and call control method - Google Patents

Description

  The present invention relates to a voice communication technique using an IP (Internet Protocol) network, and more particularly to a call control technique for a dial-in service provided in a voice communication service (VoIP service: Voice over Internet Protocol).

The VoIP service, which is voice communication over an IP network, has attracted much attention because it is cheaper than a conventional PSTN (Public Switched Telephone Network) in both system construction and operation.
In voice communication on an IP network, a method is used in which voice data is divided into voice packets made up of small-capacity digital data on the transmitting side and transmitted, and decoded on the receiving side. As a result, voice and data can coexist without being distinguished and can be transmitted and received on the same IP network.

Such a VoIP service system is a VoIP service system for services provided by a conventional PBX system in accordance with a transition from a private branch exchange (PBX) system using a conventional PSTN to a VoIP service system. The realization of is being studied.
One such service is a voice VPN service using a VPN (Virtual Private Network). This type of voice VPN service is built on a sharable IP network by virtually constructing a network dedicated to users and connecting PBX systems at each branch office / branch located at different locations to integrate the extensions. This is a service that realizes an extension transmission function between terminals.

  A service useful for such a PBX system is a dial-in service. Dial-in service is a service that allows one or more additional numbers (hereinafter referred to as child numbers) to be added to one contracted telephone number (hereinafter referred to as parent number), and uses multiple terminals at low cost. It is. According to this service, if there is an incoming call with either the parent number or the child number on the network side as the destination telephone number, the destination telephone number is notified when the incoming call is notified from the network side. Can be received by the PBX system or the dial-in switching device, and the terminal corresponding to the destination telephone number can be individually called.

The applicant has not yet found prior art documents related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in this specification.
JP 2003-152890 A JP 2003-283653 A JP 2003-018182 A

  However, in a general call control protocol such as SIP (Session Initiation Protocol) used in the VoIP service system, a register registration request (from a terminal connected to its own device) is received from a call control server provided on the network side. REGISTER requests) are periodically received, and registration information used for call control of each terminal, such as the telephone number and IP address of each terminal, is managed for each terminal. In the conventional VoIP service system, When a dial-in service is provided, it is necessary to individually accept register registration requests not only from the parent number terminal but also from the child number terminal. Therefore, the register registration request related to each terminal has a problem that the processing of the call control server becomes complicated and the processing load increases, and the traffic on the line connecting the call control server and each terminal increases.

  The present invention is to solve such a problem, and can reduce the processing load of the call control server caused by the register registration request for each terminal, and can be used in a line connecting the call control server and each terminal. An object of the present invention is to provide a VoIP service system, a call control server, and a call control method that can suppress an increase in traffic.

  In order to achieve such an object, the VoIP service system according to the present invention accommodates each terminal in a call control server for a plurality of terminals that transmit and receive voice packets via an IP network, and registration information of the terminals. Is a VoIP service system that realizes voice communication with a terminal using an IP network by performing call control based on the call control server, and the call control server includes a parent number that constitutes a dial-in service among the external line numbers of each terminal. A contract information table for managing the correspondence with the child number, a registration information table for managing various types of registration information used for call control of each terminal for each external line number of each terminal, and a register registration request related to the terminal In addition to registering the registration information included in the register registration request in the registration information table in association with the external line number of the terminal, the contract information table If by referring to the table child numbers to the external number and parent ID exists is one and a registration management unit for registering the registration information about the child number to the registration information table.

  At this time, the registration management means may use child number registration information for instructing reference to the registration information of the parent number registered in the registration information table as the registration information regarding the child number. Alternatively, the registration management unit may use the same registration information as the registration information of the parent number registered in the registration information table as the registration information regarding the child number.

  The call control server according to the present invention accommodates a plurality of terminals that transmit and receive voice packets via the IP network and performs call control based on registration information of the terminals, thereby enabling a terminal using the IP network. A call control server for a VoIP service system that realizes voice communication, and a contract information table for managing the correspondence between a parent number and a child number constituting a dial-in service among the external line numbers of each terminal, and each terminal Registration information table for managing various types of registration information used for call control of the terminal for each external line number, and registration included in the register registration request in association with the external line number of the terminal in response to the register registration request for the terminal Register the information in the registration information table and refer to the contract information table if there is a child number with the external number as the parent number. In which and a registration management unit for registering the registration information about the number to the registration information table.

  At this time, the registration management means may use child number registration information for instructing reference to the registration information of the parent number registered in the registration information table as the registration information regarding the child number. Alternatively, the registration management unit may use the same registration information as the registration information of the parent number registered in the registration information table as the registration information regarding the child number.

  In addition, the call control method according to the present invention accommodates a terminal in a call control server for a plurality of terminals that transmit and receive voice packets via the IP network, and performs call control based on registration information of the terminal. A call control method of a VoIP service system that realizes voice communication with a terminal using an IP network, wherein a call control server sets between a parent number and a child number constituting a dial-in service among the external line numbers of each terminal. A step of managing correspondence in the contract information table, a step of managing in the registration information table various registration information used for call control of each terminal by the call control server, and a call control server In response to a register registration request relating to a terminal, the registration information included in the register registration request is associated with the external line number of the terminal. And a registration management step of registering registration information related to the child number in the registration information table when there is a child number having the external number as a parent number with reference to the contract information table. .

  In the registration management step, as the registration information related to the child number, the child number registration information for instructing reference to the registration information of the parent number registered in the registration information table may be used. Alternatively, in the registration management step, the same registration information as the registration information of the parent number registered in the registration information table may be used as the registration information regarding the child number.

According to the present invention, the call control server manages the correspondence between the parent number and the child number constituting the dial-in service among the external line numbers of each terminal accommodated, and makes a register registration request for any terminal. Accordingly, the registration information included in the register registration request is registered in the registration information table in association with the external line number of the terminal, and there is a child number with the external line number as a parent number by referring to the contract information table. In this case, since the child number is registered in the registration information table, a register registration request regarding the child number for which the dial-in service is provided can be omitted.
Therefore, it is possible to reduce the processing load on the call control server caused by a register registration request relating to a terminal having a child number of the dial-in service, and to suppress an increase in traffic on a line connecting the call control server and each terminal.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a VoIP service system according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the VoIP service system according to the first embodiment of the present invention.
This VoIP service system includes a call control server 10, an IP network 20, an IP-PBX 25, and terminals 30 to 33.

In FIG. 1, terminals 30 to 33 are connected to an IP network 20 including an IP-VPN network via an access line such as a wide area LAN (Local Area Network) line, and various packets are transmitted via the IP network 20. VoIP voice communication and data communication are performed by exchanging.
The IP-PBX 25 is connected to an IP network 20 including an IP-VPN network via an access line such as a wide area LAN (Local Area Network) line, and manages the terminals 31 to 33 accommodated under the IP-PBX 25. The terminals 31 to 33 are connected to the IP network 20.

A call control server 10 is connected to the IP network 20 and performs call control of these terminals 30 to 33 and the IP-PBX 25 by exchanging call control packets with the terminals 30 to 33 and the IP-PBX 25.
Further, a VoIP gateway that connects another VoIP service system and the VoIP service system, a PSTN gateway that connects PSTN and the VoIP service system, and the like are connected to the IP network 20 as necessary (not shown). )

Further, each terminal 30 to 33 is connected to each terminal 30 in the voice VPN group, further in the global telephone network to which each terminal 30 to 33 belongs, for example, the entire IP telephone network or the entire telephone network including the PSTN. An external line number is assigned as a telephone number for identifying .about.33.
In the example shown in FIG. 1, an external line number “05033333501” is assigned to the terminal 30. The terminals 31 to 33 are provided with a dial-in service. The terminal 31 is assigned with an external line number “050503600001” as a parent number, and the terminals 32 and 33 are assigned with external line numbers “050503600002”, “ 05034506003 "is assigned.

In the present embodiment, the call control server 10 manages contract information relating to the parent-child relationship of each terminal provided with the dial-in service, and in response to a register registration request relating to the parent number from the IP-PBX 25, In addition to registering registration information of a terminal having a parent number, registration information of a terminal having a child number related to the parent number is also registered.
In the following, a case will be described as an example where the dial-in service is applied to the terminals 31 to 33 under the IP-PBX 25, of which the terminal 31 has a parent number and the terminals 32 and 33 have child numbers. .

[Call control server]
Next, the call control server 10 used in the VoIP service system according to the first embodiment of the present invention will be described in detail with reference to FIG. FIG. 2 is a block diagram showing a configuration example of a call control server used in the VoIP service system according to the first embodiment of the present invention.
The call control server 10 includes a server device having a computer as a whole, and includes a communication interface unit (hereinafter referred to as a communication I / F unit) 11, a screen display unit 12, an operation input unit 13, a storage unit 14, and a control unit 15. Is provided.

The communication I / F unit 11 is a circuit unit that is connected to the IP network 20 and transmits and receives various packets such as control packets necessary for call control of the terminals 31 to 33.
The screen display unit 12 includes a screen display device such as an LCD or a CRT, and displays various information on the screen based on instructions from the control unit 15.
The operation input unit 13 includes an operation input device such as a keyboard and a mouse, detects an operator operation, and outputs the operation to the control unit 15.

The storage unit 14 includes a storage device such as a hard disk or a memory, and is used for various processes in the control unit 15, such as an extension / external line conversion table 14A, an external line / extension conversion table 14B, a contract information table 14C, and a registration information table 14D. Various management information and programs 14P are stored.
The management information is registered in the storage unit 14 in advance using the image display unit 12 and the operation input unit 13 or via the communication I / F unit 11. The program 14 </ b> P is a program for realizing various processes in the control unit 15, and is fetched in advance via the recording medium or the communication I / F unit 11 and stored in the storage unit 14.

The control unit 15 includes a microprocessor such as a CPU and its peripheral circuits, and is a functional unit that implements various functional units by reading the program 14P from the storage unit 14 and executing it.
As this functional means, there are a call control means 15A and a registration management means 15B.
Among these, the call control means 15A is a means for performing various call controls based on requests from terminals under management. The registration management unit 15B is a unit that receives a register registration request (REGISTER request / SIP) from a terminal under management, and manages registration information of the terminal in the registration information table 14D.

[Contract Information Table]
Next, the contract information table 14C used in the VoIP service system of FIG. 1 will be described in detail with reference to FIG. FIG. 3 is a configuration example of a contract information table possessed by the call control server 10.
The contract information table 14C is a table for managing the parent number in the dial-in service related to the terminal for each external line number of each terminal under the management of the call control server 10, and each dial-in service is provided. The parent-child relationship between terminals is managed by this contract information table 14C.

In FIG. 3, the parent number “050503600001”, which is the external line number of the terminal 31, is set for the terminal 32 having the external line number “050503450002” and the terminal 33 having the external line number “0505034506003”. As a result, it can be seen that terminals 32 and 33 having child numbers exist for terminals 31 having parent numbers.
In addition, since the parent number is not set for the terminal 30 of the external line number “05033335001” and is not specified as the parent number of another external line number, it is understood that the dial-in service is not provided. .

  The call control server 10 searches the contract information table 14C for an external line number that matches the destination telephone number in response to a call request from an arbitrary terminal under management or a connection request from another call control server. Confirm the parent number corresponding to the outside line number.

[Registration information table]
Next, the registration information table 14D used in the VoIP service system of FIG. 1 will be described in detail with reference to FIG. FIG. 4 is a configuration example of a registration information table possessed by the call control server 10.
The registration information table 14D includes various registration information used for call control of each terminal such as a contract ID, a password, an IP address, and a subscriber blocked state for each external line number of each terminal managed by the call control server 10. It is a table that manages.

In FIG. 4, for example, for the terminal 30 with the external line number “05033333501”, the contract ID “256”, the password “hoge1”, the IP address “ab.0.1”, the subscriber blocked state “available”, etc. You can see that the registration information is set.
In addition, registration information such as a contract ID “123456”, a password “hoge2”, an IP address “ab.b.1.1”, and a subscriber blocking state “available” is stored for the terminal 31 of the external line number “050503450001”. You can see that it is set. For the terminal 32 with the external line number “05050360002” corresponding to the child number and the terminal 33 with the external line number “050503600002”, the subscriber block state “usable” is specifically set, but the contract ID, password, Each item such as an IP address is described so as to refer to an item related to the terminal 31 of the parent number.

  In response to the register registration request from the terminal 30 or the IP-PBX 25 under the control, the call control server 10 registers the registration information notified by the register registration request in the registration information table 14D in association with the external line number. At that time, referring to the contract information table 14C, if there is a child number whose parent number is the external line number of the registration information, as in the terminals 32 and 33 described above, the parent number reference is instructed. The child number entry is registered in the registration information table 14D in association with the child number. The subscriber blocking state in the registration information table 14D is set when the terminal needs to be blocked, such as when maintenance is performed by a maintenance person or when an authentication error occurs.

[Operation of First Embodiment]
Next, the registration management processing operation of the VoIP service system according to the first embodiment of the present invention will be described with reference to FIG. FIG. 5 is a flowchart showing the registration management processing operation of the VoIP service system according to the first embodiment of the present invention.
Here, a case where a register registration request is made from the IP-PBX 25 to the call control server 10 in the VoIP service system of FIG. 1 described above will be described as an example.

The IP-PBX 25 performs call control via the IP network 20 for register registration requests relating to a parent number of a terminal that is provided with a dial-in service among terminals under its own device periodically or as necessary. Send to server 10.
The control unit 15 of the call control server 10 receives the register registration request from the IP-PBX 25 via the communication I / F unit 11, and starts the registration management process of FIG. 5 by the registration management unit 15B.

  The registration management means 15B first acquires registration information from the received register registration request (step 101). This registration information includes information such as an external line number to be registered, a contract ID, a password, and an IP address of the IP-PBX 25. The registration management unit 15B registers other registration information in the registration information table 14D of the storage unit 14 in association with the external line number of the registration information (step 101).

Subsequently, the contract information table 14C of the storage unit 14 is referred to search for an external line number having a parent number that matches the registered external line number, that is, a child number (step 102). Here, when there is a child number having the external number as a parent number (step 102: YES), the child number registration information for instructing the parent number reference is associated with the child number to the registration information table 14D. Each is registered (step 103), and a series of registration management processes are terminated. If no child number is found in step 102 (step 102: NO), the series of registration management processes is terminated.
Therefore, in response to a register registration request relating to the terminal 31, the terminals 32 and 33 having the child number as the parent number are also registered in the registration information table 14D.

As described above, in this embodiment, the call control server manages the parent-child relationship between the parent number and the child number provided with the dial-in service in the contract information table, and if a register registration request is received, Register the registration information in the registration information table in association with the external line number to be registered, and if a child number is set for the external line number to be registered with reference to the contract information table, registration related to the child number Since the information is also registered in the registration information table, it is possible to omit a register registration request relating to a child number provided with the dial-in service.
Therefore, it is possible to reduce the processing load on the call control server caused by a register registration request relating to a terminal having a child number of the dial-in service, and to suppress an increase in traffic on a line connecting the call control server and each terminal.

  In the above description, the register registration request related to the parent number of the terminal that is provided with the dial-in service among the terminals under the IP-PBX 25 has been described as an example, but the terminal that is directly accommodated in the call control server 10 Also for the terminal 30, a register registration request is transmitted from the terminal 30 to the call control server 10, and the call control server 10 associates the registration information with the external line number in the registration information table 14D by the registration management process similar to FIG. be registered. In addition, a register registration request is transmitted from the IP-PBX 25 to the call control server 10 for a terminal (not shown) having a telephone number independently contracted under the IP-PBX 25, and the external line number is similar to the terminal 30. The registration information is registered in the registration information table 14D in association with. In these cases, since the child number is not set for the external line number, the registration process for the child number is not performed.

[Call connection processing]
Next, a call connection process of the VoIP service system according to the present embodiment will be described with reference to FIG. FIG. 6 is a sequence diagram showing call connection processing of the VoIP service system according to the present embodiment.
Here, a case where the terminal 30 transmits to the terminal 32 in the VoIP service system of FIG. 1 described above will be described as an example.

  The control unit 15 of the call control server 10 receives a call received from the terminal 30 by the call control means 15A in response to a call request from a terminal under its own device (step 200).

  Next, referring to the registration information table 14D in the storage unit 14, the individual terminal blockage status is confirmed in the called terminal 32 here corresponding to the destination telephone number consisting of the outside line number (step 202). If the side terminal is unusable (step 203: NO), a calling error is notified to the calling side terminal 30 (step 204), and a series of call connection processing operations are terminated.

  On the other hand, if the destination terminal is usable in step 203 (step 203: YES), the IP address of the destination terminal is acquired from the registration information table 14D (step 210). At this time, as in the case of the terminal 32, when the reference to the parent number is stored in the IP address column of the called terminal, the contract information table 14C in the storage unit 14 is referred to correspond to the destination telephone number. The IP address corresponding to the parent number, that is, the IP address of the IP-PBX 25 is acquired from the registration information table 14D.

The call control means 15A uses the IP address of the called side terminal acquired in this way as the source information of the outside line number of the terminal 30 that is the calling side terminal, and receives the outside line number of the terminal 32 that is the called side terminal. A connection request as destination information is transmitted from the communication I / F unit 11 to the IP network 20 (step 211).
This connection request is received by the IP-PBX 25 via the IP network 20, the external line number of the called terminal is confirmed by the destination information included in the connection request (step 212), and the external line number is changed from the IP-PBX 25 to the external line number. A connection request is transmitted to the corresponding called terminal 32 (step 213).

In response to a connection request from the IP-PBX 25, the terminal 32 notifies the user of the incoming call by sending a ringtone from a speaker or displaying an incoming call using an LED or LCD (step 214). A response is notified to the IP-PBX 25 according to the response operation by (step 215).
The response from the terminal 32 is notified to the call control server 10 via the IP-PBX 25 (step 216), and further notified from the call control server 10 to the originating terminal 30 (step 217).

  As a result, a RTP (Real-time Transport Protocol) session is established between the terminal 30 and the terminal 32 via the IP network 20 and the IP-PBX 25, and VoIP voice communication is started (step 218). A series of call connection processing operations in the system ends.

[Second Embodiment]
Next, a VoIP service system according to the second embodiment of the present invention will be described. The configuration of the VoIP service system and the configuration of the call control server 10 are the same as those in the first embodiment described above, and detailed description thereof is omitted here.
In the first embodiment described above, when the call control server 10 registers the registration information of the child number in the registration information table 14D, the call control server 10 instructs to refer to the registration information corresponding to the parent number of the child number. The case has been described in which the registration information for the child number is associated with the child number and registered in the registration information table 14D. In the present embodiment, the same registration information as the parent number is used as the child number registration information.

  That is, in step 103 of FIG. 5 described above, the same registration information as the parent number is registered in the registration information table 14D in association with the child number. As a result, in the registration information table 14D of FIG. 4, for the terminal 32 with the external line number “05050360002” and the terminal 33 with the external line number “050503600002” corresponding to the child numbers, the items such as the contract ID, password, and IP address are Similar to the terminal 31 of the parent number, that is, the external line number “050503600001”, the registration information for the child number such as the contract ID “123456”, the password “hoge2”, and the IP address “ab.b.1.1” is set.

  As described above, since the same registration information as the registration information of the parent number corresponding to the child number is used as the registration information for the child number, when referring to the registration information regarding the child number in call control, the registration of the child number is performed. Information can be obtained directly from the registration information table 14D. Therefore, as compared with the first embodiment, it is not necessary to acquire the parent number of the child number and refer to the registration information of the parent number, and the processing time required for referring to the registration information can be shortened.

[Extended embodiment]
In each of the above embodiments, the case where each terminal is managed by one call control server 10 has been described as an example. However, the number of call control servers can be flexibly increased or decreased according to the configuration of each terminal or base. It is possible to obtain the same effects as described above.

  In addition, the call control packet exchanged between the call control server 10 and the terminal 30 and the IP-PBX 25 has a very small amount of data, and delay is not a problem. Further, VoIP voice communication passes through the call control server 10. Therefore, the call control server 10 is provided in an external IP network (not shown) connected to the IP network 20 via the WAN line, and the WAN line and the external network are used. You may make it perform call control of each terminal via an IP network.

It is a block diagram which shows the structure of the VoIP service system concerning the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the call control server used with the VoIP service system concerning the 1st Embodiment of this invention. It is a structural example of the contract information table used with the VoIP service system concerning the 1st Embodiment of this invention. It is a structural example of the registration information table used with the VoIP service system concerning the 1st Embodiment of this invention. It is a flowchart which shows the registration management process of the VoIP service system concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the call connection process of the VoIP service system concerning the 1st Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Call control server, 11 ... Communication I / F part, 12 ... Screen display part, 13 ... Operation input part, 14 ... Memory | storage part, 14A ... Extension / external line conversion table, 14B ... External line / extension conversion table, 14C ... Contract Information table, 14D ... Registration information table, 14P ... Program, 15 ... Control unit, 15A ... Call control means, 15B ... Registration management means, 20 ... IP network, 25 ... IP-PBX, 30-33 ... Terminal.

Claims (9)

With respect to a plurality of terminals that transmit and receive voice packets via the IP network, each terminal is accommodated by a call control server and call control is performed based on registration information of the terminal, whereby the terminal using the IP network VoIP service system that realizes voice communication of
The call control server
A contract information table for managing a correspondence relationship between a parent number and a child number constituting a dial-in service among the external line numbers of the terminals;
A registration information table for managing various types of registration information used to call-control the terminal for each external line number of the terminal;
In response to the register registration request for the terminal, the registration information included in the register registration request is registered in the registration information table in association with the external line number of the terminal, and the external line number is referred to the parent information by referring to the contract information table. A VoIP service system comprising: a registration management means for registering registration information relating to a child number in the registration information table when a child number as a number exists. In the VoIP service system according to claim 1,
The registration management means uses child number registration information for instructing reference to registration information of the parent number registered in the registration information table as registration information relating to the child number. . In the VoIP service system according to claim 1,
The VoIP service system, wherein the registration management means uses the same registration information as the registration information of the parent number registered in the registration information table as the registration information related to the child number. A VoIP service that accommodates a plurality of terminals that transmit and receive voice packets via an IP network and performs voice communication with the terminals using the IP network by performing call control based on registration information of the terminals A call control server of the system,
A contract information table for managing a correspondence relationship between a parent number and a child number constituting a dial-in service among the external line numbers of the terminals;
A registration information table for managing various types of registration information used to call-control the terminal for each external line number of the terminal;
In response to the register registration request for the terminal, the registration information included in the register registration request is registered in the registration information table in association with the external line number of the terminal, and the external line number is referred to the parent information by referring to the contract information table. A call control server comprising registration management means for registering registration information relating to a child number in the registration information table when a child number as a number exists. The call control server according to claim 4,
The registration management means uses, as the registration information related to the child number, child number registration information for instructing reference to the registration information of the parent number registered in the registration information table. . The call control server according to claim 4,
The call control server, wherein the registration management means uses the same registration information as the registration information of the parent number registered in the registration information table as the registration information related to the child number. For a plurality of terminals that transmit and receive voice packets via the IP network, the terminal is accommodated by a call control server and call control is performed based on registration information of the terminal, whereby the terminal using the IP network A call control method for a VoIP service system that realizes voice communication,
Managing a correspondence relationship between a parent number and a child number constituting a dial-in service among the outside line numbers of each terminal by a call control server in a contract information table;
Managing, in a registration information table, various registration information used to call-control the terminal for each external line number of each terminal by a call control server;
In response to a register registration request for the terminal, the call control server registers the registration information included in the register registration request in association with the external line number of the terminal in the registration information table, and refers to the contract information table. And a registration management step of registering registration information related to the child number in the registration information table when there is a child number whose parent number is the external line number. The call control method according to claim 7, wherein
The call management method, wherein the registration management step uses, as the registration information related to the child number, child number registration information for instructing reference to the registration information of the parent number registered in the registration information table. . The call control method according to claim 7, wherein
The registration management step uses the same registration information as the registration information of the parent number registered in the registration information table as the registration information related to the child number.

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