JP4331253B2 - 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 connecting terminals between terminals 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.

In such a VoIP service system, with the transition from a PBX (Private Branch eXchange) system using a conventional PSTN, implementation of the service provided by the conventional PBX system in the VoIP service system is considered. Has been.
One such service is a voice VPN service using a VPN (Virtual Private Network). This type of voice VPN service virtually builds a network dedicated to users and connects PBX systems at each branch office / branch located at different locations to integrate the extension, and provides an extension transmission function between terminals at these locations. It is a service to be realized.

  Conventionally, in such a voice VPN service, an extension number consisting of a base number for identifying the base and a terminal number for identifying each terminal in the base is given to the terminal at each base. , A common extension number plan, which is a rule for assigning extension numbers to terminals at these bases, was used. When there is a call request, the base number and terminal number are acquired from the destination telephone number based on the number of digits, and the destination terminal at the destination base is obtained via the VPN based on the base number and terminal number. And the extension connection.

  For example, the base number and the terminal number are acquired from the destination telephone number based on the number of digits, and the terminal corresponding to the terminal number in the base corresponding to the base number is called. When the destination telephone number is only the number of digits corresponding to the terminal number, the destination telephone number is acquired as the terminal number, and the terminal corresponding to the terminal number in the same base as the calling side is called. When the destination telephone number has the number of digits corresponding to the base number, the destination telephone number is acquired as the base number, and the PBX system of the base corresponding to the base number is 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 such a conventional VoIP service system, when providing a voice VPN service to a plurality of bases, it is necessary that the extension number plans, which are rules for assigning extension numbers to the terminals at these bases, match. For example, if the extension number plans for the terminals are different at the two bases to which the voice VPN service is applied, up to which digits of the destination telephone numbers specified in the outgoing call request are base numbers and from which digits to the extension number. It is not possible to easily grasp the contents of the destination telephone number with a single number of digits, such as whether the base number is included or not.

  Therefore, when different extension number plans that have been used for each PBX at each base are integrated with a single voice VPN service, it is necessary to change the extension number plans so that they match between the bases. There is a problem that it is impossible to realize the transition from the conventional PBX system to the VoIP service system and the provision of the voice VPN service while continuously using the extension number plan that has been used.

  Further, when providing an advanced extension call function in the VoIP service system, for example, a base number omission function that can omit a base number when an extension is sent to a terminal in the same base, or a subordinate IP-PBX and the VoIP service system When providing an IP-PBX compatible function for calling the IP-PBX when an extension number of a terminal that does not directly manage the terminal number is specified, various configurations are available as a destination telephone number specified by an extension call request. Mixed. For this reason, as in the conventional VoIP service system, in order to grasp the destination telephone number specified in the extension call request by the number of digits, it is necessary to individually manage the number of digits according to the various configurations described above. Processing is greatly complicated, and development costs and maintenance for system construction further increase.

  The present invention is for solving such problems, and even when the extension numbering rules at each base are different, the bases can be easily and flexibly integrated with each other, and for each terminal at these bases It is an object of the present invention to provide a VoIP service system, a call control server, and a call control method that can provide a higher-level and easier-to-operate extension transmission function.

  In order to achieve such an object, the VoIP service system according to the present invention performs call control of a plurality of terminals provided at each base and transmitting / receiving voice packets via an IP network by a call control server. A VoIP service system that realizes voice communication with a terminal using an IP network by performing a call control server with a base number of an arbitrary number of digits for identifying the base of the terminal for each terminal and the base An extension / external line conversion table for managing an extension number consisting of a terminal number of an arbitrary number of digits for identifying the terminal and the external line number of the terminal, and each extension number of the extension / external line conversion table A destination search means for searching for an extension number that matches the target destination telephone number in all digits, and obtaining an external number associated with the matched extension number; A call control means for obtaining an external line number corresponding to the destination telephone number specified in the outgoing call request by the destination search means in response to the outgoing call request from the incoming call request, and performing outgoing processing to the terminal corresponding to the external line number; Is provided.

  At this time, the destination search means may change the number of digits of the destination telephone number specified in the call request, and perform a search for the changed destination telephone number.

  Also, if the destination search means cannot find an extension number that matches all digits of the destination phone number specified in the outgoing call request, it searches for an extension number that matches the changed destination phone number in all digits. You may make it perform.

  As a specific example of changing the number of digits for the destination telephone number, the number of digits of the destination telephone number is changed by adding the base number of the terminal that is the source of the outgoing call request to the destination telephone number in the destination search means. You may make it do.

  Alternatively, in the extension / outside line conversion table, for an IP-PBX that accommodates a plurality of terminals that are provided as bases and whose terminal numbers are not managed by the call control server, the extension number consisting only of the base number and the IP-PBX The number of digits of the destination phone number is changed by deleting the last digit of the destination phone number when changing the destination by means of the destination search means. If an extension number that matches all the digits is not found in the search, the change and the search may be repeated.

  In addition, when the destination search means does not find the first search means for searching for the extension number that matches all the digits of the destination telephone number specified in the call request, and the extension number that matches the first search means A second search means for searching for an extension number that matches in all digits with the destination telephone number whose number of digits has been changed by adding the base number of the terminal that is the source of the transmission request to the destination telephone number; If a matching extension number is not found by the search means of No. 2, the last one digit of the destination telephone number is deleted to search for an extension number that matches all the digits of the destination telephone number whose number of digits has been changed. If the extension number is not found, a third search means for repeatedly performing the change and search may be provided.

  The call control server includes a user accommodation server that performs call control of each terminal via the IP network, and an extension management server that is connected to the user accommodation server and manages the extension number of each terminal. An extension management server having an extension / external line conversion table and a destination search means, and in response to a search request from the user accommodation server, an external number corresponding to the destination telephone number specified in the search request Search and notify, provide a call control means in the user accommodation server, request the extension management server to search for the external number corresponding to the destination telephone number specified in the call request from the terminal, and notify from the extension management server The outgoing call processing to the terminal corresponding to the outside line number may be performed.

  In addition, the call control server according to the present invention performs call control on a plurality of terminals that are provided at each site and transmits / receives voice packets via the IP network, so that the terminals using the IP network A call control server that realizes voice communication, and includes, for each terminal, a base number having an arbitrary number of digits for identifying the base of the terminal and a terminal number having an arbitrary number of digits for identifying the terminal within the base From the extension / external line conversion table that associates and manages the extension number and the external line number of the terminal, and the extension number of the extension / external line conversion table, the extension number that matches the target destination telephone number in all digits is selected. Receiving destination search means for searching and obtaining the external number associated with the matched extension number, and in response to the call request from the terminal, the external line number corresponding to the destination telephone number specified in the call request Acquired by the destination searching means, in which and a call control means for performing a transmission processing to the terminal corresponding to the external number.

  In addition, another call control method according to the present invention provides a terminal using an IP network by performing call control of these terminals with respect to a plurality of terminals provided at each site and transmitting / receiving voice packets via the IP network. Connected to a user accommodation server that realizes voice communication over the Internet, and in response to a destination search request from the user accommodation server, searches for an external line number of the terminal corresponding to the destination telephone number specified in the destination search request An extension number consisting of a base number having an arbitrary number of digits identifying the base of the terminal and a terminal number having an arbitrary number of digits identifying the terminal within the base From the extension / external line conversion table managed in association with the external line number of the terminal and each extension number of the extension / external line conversion table, an extension number that matches the destination telephone number in all digits is searched for and matched. Gets the external number associated with the extension, in which and a destination search unit that notifies the user accommodation server.

  The call control method according to the present invention is a call that realizes voice communication with a terminal using an IP network in a call control server for a plurality of terminals that are provided at each site and transmit / receive voice packets via the IP network. An extension consisting of a base number having an arbitrary number of digits identifying the base of the terminal and a terminal number having an arbitrary number of digits identifying the terminal within the base for each terminal by the call control server A management step for associating the number with the extension number of the terminal and managing the extension number in the extension / external line conversion table, and the call control server sets the target destination telephone number and all of the extension numbers in the extension / external line conversion table. In response to a call request from the terminal, a destination search step for searching for an extension number that matches the digits and obtaining an external number associated with the matched extension number, and a call control server The external number corresponding to the specified destination telephone number in the outbound request acquired by the destination search step, in which and a call control step of performing a transmission processing to the terminal corresponding to the external number.

  In addition, another call control method according to the present invention provides a terminal using an IP network by performing call control of these terminals with respect to a plurality of terminals provided at each site and transmitting / receiving voice packets via the IP network. In response to a destination search request from the user accommodation server, a call control server connected to the user accommodation server that realizes voice communication at the terminal of the terminal corresponding to the destination telephone number specified in the destination search request A call control method for searching for an outside line number, wherein a call control server has a base number of an arbitrary number of digits for identifying the base of the terminal for each terminal and an arbitrary number of digits for identifying the terminal within the base. A management step of associating an extension number consisting of a terminal number with an external number of the terminal and managing it in the extension / external line conversion table, and by the call control server, out of each extension number in the extension / external line conversion table A destination search step of searching for an extension number that matches the destination telephone number in all digits, obtaining an external number associated with the matched extension number, and notifying the user accommodation server. is there.

  According to the present invention, in the call control server, for each terminal, an extension number composed of a base number having an arbitrary number of digits and a terminal number having an arbitrary number of digits and an external line number of the terminal are associated in the extension / external line conversion table. In response to a call request from the terminal, an extension number that matches the destination telephone number in all digits is searched from each extension number in the extension / outside line conversion table, and the matched extension number Because the outgoing call processing to the terminal corresponding to the external number associated with is performed, even if there are terminals with different numbers of base numbers of each base and terminal numbers of each terminal, any destination An external line number corresponding to the telephone number can be acquired.

  Therefore, even if the rules for assigning extension numbers at each site are different and the number of digits of the site number or terminal number is different, the number of digits of the site number or terminal number can be managed easily and easily without managing the number of digits for each site or for each terminal. Each base can be flexibly integrated. Thereby, even when the extension number plans of the respective bases are different, the application of the voice VPN service is not limited, and it is possible to flexibly cope with the transition from the conventional PBX system to the VoIP service system and the provision of the voice VPN service.

  Also, when searching for a destination, the number of digits of the destination telephone number is changed by assuming that the destination telephone number specified in the call request from the terminal is an incomplete extension number, and the changed destination telephone Since the extension / external line conversion table is searched by number and the external line number corresponding to the destination telephone number is acquired, the normal extension number consisting of the base number and the extension number and the base number are omitted or managed. Even when an incomplete extension number with an external terminal number added is used as a destination phone number, the destination phone number is flexibly analyzed and a desired external number is obtained. Obtainable. Therefore, even if the rules for assigning extension numbers at each site are different and the number of digits of the site number or terminal number is different, the site number is omitted for each terminal at these sites, for example, when making an extension call to a terminal at the same site It is possible to easily realize a more advanced and easy-to-operate extension call function such as a base number omission function that can be provided, and it can be provided without using a complicated configuration.

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, and terminals 31 to 33.

  In FIG. 1, each of the terminals 31 to 33 is connected to the IP network 20 via an access line such as a wide area LAN (Local Area Network) line, and various packets are exchanged with each other via the IP network 20. By doing so, VoIP voice communication and data communication are performed. The IP network 20 includes an IP-VPN network, a public IP network, and the like. The IP network 20 is connected to a call control server 10 that performs call control of the terminals 31 to 33 by exchanging call control packets with the terminals 31 to 33.

  The terminals 31 to 33 are communication terminals that perform VoIP voice communication by transmitting and receiving voice packets. In the example of FIG. 1, it is assumed that the terminals 31 and 32 are installed at the same base 40 such as the same branch, and the terminal 33 is installed at a base 41 different from the base 40. These bases 40 and 41 are assigned base numbers “33” and “334” for identifying individual bases in the VoIP service system, and numbers having different numbers of digits are used as the base numbers. ing. Note that these bases 40 and 41 are not limited to those indicating physical arrangement positions, and may be regarded as units for managing terminals. Therefore, different bases may be provided at the same point.

  Terminal numbers for identifying individual terminals within the base are assigned to the terminals 31 to 33 arranged at the bases. In the example of FIG. 1, terminal number “330” is assigned to terminal 31, and terminal number “4440” is assigned to terminal 32. Further, the terminal number “555” is assigned to the terminal 33. Therefore, numbers having different numbers of digits are used as these terminal numbers.

  Each terminal 31 to 33 is connected to each terminal 40, 41, in addition to the global telephone network to which each terminal 31 to 33 belongs, for example, the entire IP telephone network or the entire telephone network including PSTN. An outside line number is assigned as a telephone number for identifying 31-33. In the example of FIG. 1, an external line number “05033335002” is assigned to the terminal 31, and an external line number “05034506001” is assigned to the terminal 32. The terminal 33 is assigned with an external line number “05050360002”.

When calling an arbitrary terminal using the extension transmission function of the VoIP service system, the base number of the base to which the terminal belongs and the terminal number of the terminal may be specified as the destination telephone number. For example, when an extension call is made from the terminal 31 to the terminal 33, the terminal 31 uses the extension number “344-555” obtained by connecting the base number “344” of the terminal 33 and the terminal number “555” as the destination telephone number indicating the terminal 33. "Is specified. On the other hand, when an extension call is made from the terminal 33 to the terminal 32, the terminal 33 uses the extension number “33-4440” obtained by connecting the base number “33” of the terminal 32 and the terminal number “4440” as the destination telephone number indicating the terminal 32. "Is specified.
Therefore, when the bases of different extension number plans are integrated, the number of digits of the destination telephone number specified from the terminal in the transmission request at the time of extension transmission is different.

  In the present embodiment, an extension / outside line conversion table is provided in the call control server 10, and for each terminal under the management of the call control server 10, a base number having an arbitrary number of digits for identifying the base to which the terminal belongs and An extension number composed of an arbitrary number of terminal numbers for identifying the terminal in the base and an external line number of the terminal are managed in association with each other, and a destination telephone number designated by a call request from the terminals 31 to 33 Is assumed to be an extension number consisting of a base number and a terminal number of a terminal under the control of the call control server 10, the destination telephone number and all its digits from among the extension numbers of the extension / outline conversion table The extension numbers that match are searched for, and the external line number associated with the extension number is acquired and used for the calling process.

Further, in this embodiment, when calling a terminal in the same base, “33-4440” may be designated as the incoming telephone number as described above, but an extension transmission function that can omit the base number is provided. And For example, when calling the terminal 32 belonging to the same base 40 as the terminal 31 from the terminal 31, the base number “33” may be omitted and the terminal number “4440” of the terminal 32 may be designated as the destination telephone number. . As a result, the number of input digits of the destination telephone number can be omitted, and the operation burden on the user can be reduced.
Therefore, when providing a base number omission function that can omit the base number when making an extension call to a terminal within the same base as the extension call function, the number of digits of the destination telephone number specified from the terminal in the outgoing call request when making an extension call Is different.

  In the present embodiment, it is assumed in the call control server 10 that the destination telephone number specified in the outgoing call request is an incomplete extension number that is not an extension number composed of the base number and terminal number of the destination terminal. To change (adjust) the number of digits of the destination telephone number, and change the destination telephone number and all of the changed destination telephone numbers from among the extension numbers in the extension / outside line conversion table. An extension number that matches by a digit is searched, an external number associated with the extension number is acquired, and used for outgoing call processing.

  In this case, more specifically, the call control server 10 searches the extension / outside line conversion table for an outside line number corresponding to the destination telephone number specified in the call request from the terminals 31 to 33, and the destination telephone If no external number corresponding to the number is found, the number of digits of the destination telephone number is changed assuming that the destination telephone number is an incomplete number consisting only of the terminal number, and the extension / external line conversion table is used again. It is intended to be searched. When this re-search is performed, the base number of the caller terminal is added to the destination telephone number to change the number of digits, and the changed destination telephone number is used.

[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 stores various management information such as an extension / external line conversion table 14A and an external line / extension conversion table 14B and a program 14P used for various processes in the control unit 15. 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 destination search means 15B. The call control means 15A is a means for performing various call controls based on requests from the terminals 31 to 33. The destination search unit 15B refers to the extension / outside line conversion table 14A in the storage unit 14 and searches for an external line number of the destination terminal corresponding to the destination telephone number notified by the call request from the terminals 31 to 33. Means.

[Extension / Outline conversion table]
Next, with reference to FIG. 3, the extension / external line conversion table 14A used in the VoIP service system according to the first embodiment of the present invention will be described in detail. FIG. 3 is a configuration example of an extension / outer line conversion table. The extension / outside line conversion table 14A is a table for managing the voice VPN group number and the outside line number to which the terminal belongs for each extension number unique to each terminal.

  In the extension / outside line conversion table 14A, the extension number is a regular extension number in which the base number and the terminal number of the terminal are listed over all digits. The voice VPN group number is used to identify the voice VPN group to which each terminal belongs when the call control server 10 collectively controls terminals belonging to different voice VPN groups. The external line number is used to identify each terminal 31 to 33 at least between the respective bases or in the global telephone network to which each terminal 31 to 33 belongs, for example, the entire IP telephone network or the entire telephone network including PSTN. It is a telephone number and is uniquely assigned to each terminal 31-33.

In FIG. 3, for example, the terminal 31 having the extension number “33330” belongs to the voice VPN group with the group number “1”, and the outside line number is “05033335002”.
In the call control server 10, the extension number outside the extension / outside line conversion table 14 </ b> A is matched with the destination telephone number notified by the outgoing call request, or the extension telephone number that has been added with the base number and changed the number of digits. The destination terminal is called based on the external line number according to a known VoIP call control protocol such as SIP (Session Initiation Protocol).

[External / Internal conversion table]
Next, with reference to FIG. 4, the external / internal conversion table 14B used in the VoIP service system according to the first embodiment of the present invention will be described in detail. FIG. 4 shows an example of the configuration of the external line / internal line conversion table. The external line / extension conversion table 14B is a table for managing the extension number of the terminal, the voice VPN group number to which the terminal belongs, the base number of the terminal, and the IP address of the terminal for each external number unique to each terminal. is there.
In FIG. 4, for example, the terminal 31 having the external line number “05033333002” has the extension number “33330”, belongs to the voice VPN group having the group number “1”, and has the base number “33”. Recognize.

[Operation of First Embodiment]
Next, with reference to FIG. 5, the transmission processing operation of the VoIP service system according to the first embodiment of the present invention will be described. FIG. 5 is a sequence diagram showing an outgoing call processing operation of the VoIP service system according to the first embodiment of the present invention. Here, in FIG. 1, a case will be described as an example where an extension is transmitted from the terminal 31 belonging to the base 40 to the terminal 33 belonging to the base 41.

In response to the user's extension call operation, the terminal 31 sends a call request with the destination telephone number designated by the operation as the call destination information and the external line number of the terminal 31 as the caller information. To the call control server 10 (step 100).
The control unit 15 of the call control server 10 receives the transmission request from the terminal 31 via the communication I / F unit 11, and analyzes the transmission request by the call control unit 15A. If the call request is an extension call instead of an external number such as “0ABJ”, “050”, “090”, etc., an external line corresponding to the destination telephone number specified in the call request is sent by the destination search means 15B. The number is retrieved and acquired (step 101).

  At this time, the destination search unit 15B executes a destination search process of FIG. 6 to be described later, and the destination phone number notified by the call request in the extension / outside line conversion table 14A of the storage unit 14, An extension number that matches all the digits with the number in which the number of digits of the destination telephone number is changed is searched, and the extension number corresponding to the extension number is acquired.

When the external line number is acquired, the call control unit 15A refers to the external line / extension conversion table 14B and acquires the IP address of the destination terminal, here the terminal 33, corresponding to the external line number (step 102). Then, a connection request using the external line number of the caller terminal 31 as the caller information and the callee terminal 33 as the callee information is sent from the communication I / F unit 11 via the IP network 20 based on the IP address. It transmits to the terminal 33 (step 103).
In response to a connection request from the call control server 10, the terminal 33 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 104). A response is notified to the call control server 10 in response to a response operation by the user (step 105).

The response from the terminal 33 is notified to the caller terminal 31 via the call control server 10 (step 106), whereby RTP (Real-time) is transmitted between the terminal 31 and the terminal 33 via the IP network 20. A time Transport Protocol) session is established and VoIP voice communication is started (step 107). Thereby, a series of transmission processing operations in the VoIP service system is completed.
If it is determined in step 101 that the external line number corresponding to the destination telephone number cannot be acquired, the call control means 15A notifies the terminal 31 of the disconnection indicating the extension transmission failure, and ends the series of call processing operations. To do.

[Destination search processing]
Next, with reference to FIG. 6, the destination search process executed by the call control server 10 of the VoIP service system according to the first embodiment of the present invention will be described in detail. FIG. 6 is a flowchart showing a destination search process used in the call control server of the VoIP service system according to the first embodiment of the present invention.

  The call control unit 15A of the call control server 10 executes the destination search process of FIG. 6 by the destination search unit 15B in step 101 of FIG. The destination search process includes a regular call search process (step 210) assuming that the destination telephone number specified in the call request is a regular extension number consisting of a base number and a terminal number, and the destination telephone number. Is composed of an in-base call search process (step 220) that is assumed to be an incomplete extension consisting of only a terminal number.

The destination search means 15B first refers to the extension / outside line conversion table 14A of the storage unit 14 as the regular call search process (step 210), and among the extension numbers registered in the extension / outside line conversion table 14A. Then, an extension number that matches the destination telephone number in all digits is searched (step 211).
Here, when an extension number that matches the destination telephone number in all digits is found (step 212: YES), the regular call search process (step 210) is terminated and an external number corresponding to the extension number is obtained. Then, the call control means 15A is notified (step 201), and a series of destination search processing ends.

On the other hand, in step 212, if an extension number that matches the destination telephone number in all digits is not found (step 212: NO), the destination search means 15B ends the regular call search process (step 210). Intra-site call search processing (step 220) is started.
First, the external line / extension conversion table 14B in the storage unit 14 is searched based on the transmission source information included in the transmission request, that is, the external line number of the transmission source terminal, and the base number corresponding to the external line number is acquired. Then, the number of digits is changed (adjusted) by adding the base number, that is, the originating base number to the head of the destination telephone number (step 221).

Then, referring to the extension / outer line conversion table 14A in the storage unit 14, among the extension numbers registered in the extension / outer line conversion table 14A, the extension number that matches the changed destination telephone number in all digits. Is searched again (step 222).
If an extension number that matches the changed destination telephone number in all digits is found (step 222: YES), the in-site call search process (step 220) is terminated to correspond to the extension number. The external line number to be acquired is acquired and notified to the call control means 15A (step 201), and a series of destination search processing is terminated.

  On the other hand, if no extension number that matches the changed destination telephone number in all digits is found in step 222 (step 222: NO), the destination searching means 15B ends the intra-site call search processing (step 220). Then, the call destination search failure is notified to the call control means 15A (step 202), and the series of call destination search processing ends.

  Therefore, for example, when “334555” is specified as the destination telephone number in the call request from the terminal 31 belonging to the base 40, the destination search means 15B first creates a regular number in which the destination telephone number is composed of the base number and the terminal number. In the regular call search process (step 210) assuming that the extension number is an extension number, an extension number that matches “334555” in all digits is searched in the extension / outside line conversion table 14A. In this case, since the extension number that matches all digits of “344555” is registered, the extension number “050503600002” of the extension number is acquired, and the call control means 15A uses this extension number “050503600002”. Transmission processing is performed, and the terminal 33 at the base 41 is called.

  When “4440” is specified as the destination telephone number in the call request from the terminal 31 belonging to the base 40, the destination search means 15B first authenticates the destination telephone number consisting of the base number and the terminal number. In the regular call search process (step 210), assuming that the extension number is an extension number, an extension number that matches “4440” in all digits is searched in the extension / outline conversion table 14A. In this case, the extension number that matches with “4440” in all digits is not registered and thus cannot be found, and it is assumed that the destination telephone number is an incomplete extension consisting of only the terminal number. The process proceeds to (Step 220).

  Then, the extension number that coincides with “334440” in which “4440” is changed by the originating base number “33” is re-searched in the extension / outer line conversion table 14A. In this case, since the extension number that matches “334440” is registered, the extension number “050503600001” of the extension number is acquired, and the call control means 15A performs the calling process using this extension number “050503600001”. The terminal 32 of the base 40 is called.

  Thus, in the present embodiment, in the extension / external line conversion table 14A of the call control server 10, an extension number composed of a base number having an arbitrary number of digits and a terminal number having an arbitrary number of digits, and an external line number of the terminal Are managed for each terminal, and the destination search means 15B searches the extension number in the extension / outside line conversion table 14A for the extension number that matches the target destination telephone number in all digits. Since the external number associated with the matched extension number is acquired, any incoming call can be received even if terminals with different numbers of base numbers at each base and terminal numbers at each terminal are mixed. An outside line number corresponding to the destination telephone number can be acquired.

  Therefore, even if the rules for assigning extension numbers at each site are different and the number of digits of the site number or terminal number is different, the number of digits of the site number or terminal number can be managed easily and easily without managing the number of digits for each site or for each terminal. Each base can be flexibly integrated. Thereby, even when the extension number plans of the respective bases are different, the application of the voice VPN service is not limited, and it is possible to flexibly cope with the transition from the conventional PBX system to the VoIP service system and the provision of the voice VPN service.

  Further, the destination search means 15B changes the number of digits of the destination telephone number on the assumption that the destination telephone number specified in the call request from the terminal is an incomplete extension number. The caller base number is added to the number to change the number of digits, and the extension / external line conversion table 14A is searched with the changed destination telephone number to obtain the external number corresponding to the destination telephone number. Therefore, even if a regular extension number consisting of a base number and an extension number and an incomplete extension number without the base number are mixedly used as the destination telephone number, the destination can be flexibly handled. The telephone number can be analyzed to obtain a desired outside line number.

  Therefore, even if the rules for assigning extension numbers at each site are different and the number of digits of the site number or terminal number is different, the site number is omitted for each terminal at these sites, for example, when making an extension call to a terminal at the same site It is possible to easily realize a more advanced and easy-to-operate extension call function such as a base number omission function that can be provided, and it can be provided without using a complicated configuration.

  Further, in the present embodiment, the desired outside line number is obtained in the regular call search process (step 210) assuming that the destination telephone number specified in the call request is a regular extension number composed of the base number and the terminal number. If the call destination telephone number is not an incomplete extension number consisting only of the terminal number, the local call search process (step 220) is performed. Since it is used in preference to the processing result of the intra-site call search process, it uses the original basic extension call function that allows each terminal to be called accurately by using a normal extension number. Can be surely provided to the person.

In this embodiment, the case where the intra-site call search process is executed after the regular call search process has been described as an example. However, these processes are executed in parallel, and a desired outside line number can be obtained by the normal call search process. In such a case, the external line number may be used preferentially, and the external line number obtained by the intra-site call retrieval process may be used only when the desired external line number is not obtained by the regular call retrieval process.
In addition, when priority is given to the base number omission function that allows the base number to be omitted when an extension is sent to a terminal in the same base over the extension transmission function using a normal extension number, the regular call search process and the intra-site call search process are performed. The processing result of the in-base call search process may be used in preference to the process result of the regular call search process, such as changing the processing order.

[Second Embodiment]
Next, a VoIP service system according to the second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing the configuration of the VoIP service system according to the second embodiment of the present invention. In FIG. 7, the same or equivalent parts as those in FIG.
In the present embodiment, a case will be described in which an IP-PBX accommodating a plurality of terminals is provided as a terminal controlled by the call control server 10 in the first embodiment described above.

The IP-PBX 25 is connected to the IP network 20 via an access line such as a wide area LAN (Local Area Network) line, and accommodates the IP-PBX 25 by exchanging various packets with each other via the IP network 20. VoIP voice communication and data communication between the terminals 34 and 35 are realized.
The IP-PBX 25 is managed by the call control server 10 as an individual base 42, and a base number “222” for identifying the individual base in the VoIP service system is assigned. For example, a number with a different number of digits from the base 40 is used.

Each terminal 34 and 35 accommodated in the IP-PBX 25 is assigned a terminal number for identifying each terminal within the base. In the example of FIG. 7, the terminal number “234” is assigned to the terminal 34, and the terminal number “2345” is assigned to the terminal 35. Therefore, numbers having different numbers of digits are used as these terminal numbers.
The IP-PBX 25 includes the IP-PBX 25 between the bases 40 to 42 and the global telephone network to which the terminals 31 to 35 belong, for example, the entire IP telephone network and the entire telephone network including the PSTN. An external line number representing each of the subordinate terminals 34 and 35 is assigned as a telephone number for identification. In the example of FIG. 7, the representative external line number “050503450001” is assigned to the IP-PBX 25.

  In such a VoIP service system including the IP-PBX 25, the extension number plan for the terminals 34 and 35 under the IP-PBX 25 and the connection configuration are realized in order to realize flexible management and operation for the terminals under the IP-PBX 25. The base 42 is individually managed. Thereby, the call control server 10 recognizes the IP-PBX 25 as one terminal similarly to the terminals 31 to 33, and manages the base number “222” and the representative external line number “050503500001”.

Therefore, when there is a call request specifying the extension number “222-243” of the terminal 34 under the IP-PBX 25 as the destination telephone number from the other bases 40, 41, the call control server 10 is under the control of the IP-PBX 25. Since terminal management is not performed for the terminals 34 and 35, it cannot be understood that the extension number indicates the terminal 34 in the base 42 of the IP-PBX 25, and extension transmission cannot be performed.
In the present embodiment, in order to cope with such a system form, a representative call function for transmitting a call request to a terminal under the IP-PBX 25 to an external line number representing the IP-PBX 25 is provided.

Normally, in such IP-PBX 25, a terminal that can respond to an incoming call to a representative external line number is set in advance. In the above example, the representative external number “05034505001” of the IP-PBX 25 corresponding to the base number “222” is called in response to the transmission request specifying the extension number “222-234” of the terminal 34 from the terminal 31 and the IP -An incoming call is displayed at any of the terminals under the PBX 25, and a VoIP voice call with the originating terminal 31 is started in response to a response at that terminal.
Therefore, when a representative call function for calling an IP-PBX representative external number is provided as an extension call function, the number of digits of the destination telephone number specified by the terminal in the call request for extension call differs.

  In the present embodiment, it is assumed in the call control server 10 that the destination telephone number specified in the outgoing call request is an incomplete extension number that is not an extension number composed of the base number and terminal number of the destination terminal. To change (adjust) the number of digits of the destination telephone number, and change the destination telephone number and all of the changed destination telephone numbers from among the extension numbers in the extension / outside line conversion table. An extension number that matches by a digit is searched, an external number associated with the extension number is acquired, and used for outgoing call processing.

  In this case, more specifically, the call control server 10 manages the extension number / external line conversion table by associating the representative external line number of the IP-PBX 25 with the extension number consisting only of the base number of the IP-PBX 25, and the terminals 31 to 31 If the external line number corresponding to the destination telephone number specified in the call request from 33 is searched in the extension / external line conversion table, and the external line number corresponding to the destination telephone number is not found, the destination telephone number is The number of digits of the destination telephone number is changed assuming that the number is an incomplete number consisting only of the terminal number, and the extension / outside line conversion table is searched again. When this re-search is performed, the number of digits of the destination telephone number is changed by deleting the last digit of the destination telephone number, and the extension number that matches the changed destination telephone number with all the digits is obtained. If not found, the change and search are repeated.

[Call control server]
Next, the call control server 10 used in the VoIP service system according to the second embodiment of the present invention will be described in detail. The configuration of the call control server 10 used in the VoIP service system according to the present embodiment is the same as that of the call control server 10 (see FIG. 2) used in the VoIP service system according to the first embodiment described above. The detailed description here is omitted.

[Extension / Outline conversion table]
Next, with reference to FIG. 8, the extension / external line conversion table 14A used in the VoIP service system according to the second embodiment of the present invention will be described in detail. FIG. 8 shows a configuration example of the extension / outer line conversion table. The extension / outside line conversion table 14A is a table for managing the voice VPN group number and the outside line number to which the terminal belongs for each extension number unique to each terminal.

  In the extension / outline conversion table 14A, the extension number includes a number in which the base number of the terminal and the terminal number are listed over all digits, and the extension number of the IP-PBX 25 includes only the base number. The voice VPN group number is used to identify the voice VPN group to which each terminal belongs when the call control server 10 performs call control on terminals belonging to different voice VPN groups in parallel. The external line number is at least between each of the bases or in the global telephone network to which each of the terminals 31 to 33 and the IP-PBX 25 belongs, for example, the entire IP telephone network or the entire telephone network including the PSTN, and the terminals 31 to 33 and This is a telephone number for identifying the IP-PBX 25 and is uniquely assigned to each of the terminals 31 to 33 and the IP-PBX 25. The terminal type is information indicating whether the extension number is for a terminal or IP-PBX, “0” indicates a terminal other than IP-PBX, and “1” indicates IP-PBX.

  In FIG. 8, for example, the terminal 31 having the extension number “33330” belongs to the voice VPN group having the group number “1”, the external line number is “05033335002”, the terminal type is “0”, and the IP-PBX. It turns out that it is a terminal other than. The IP-PBX 25 having the extension number (base number) “222” belongs to the voice VPN group with the group number “1”, the representative outside line number is “050503450001”, and the terminal type is “1”. It turns out that it is IP-PBX.

[External / Internal conversion table]
Next, with reference to FIG. 9, the external line / extension conversion table 14B used in the VoIP service system according to the second embodiment of the present invention will be described in detail. FIG. 9 shows an example of the configuration of the external line / internal line conversion table. The external line / extension conversion table 14B includes, for each external line number unique to each terminal, the extension number of the terminal, the voice VPN group number to which the terminal belongs, the base number of the terminal, and the IP address of the terminal / IP-PBX. It is a table to be managed.
In FIG. 9, for example, the IP-PBX 25 having the external line number “050503450001” has the extension number (base number) “222”, belongs to the voice VPN group with the group number “1”, and the base number “222”. "It can be seen that it is.

[Operation of Second Embodiment]
Next, with reference to FIG. 10, a description will be given of a destination search process executed by the call control server 10 as an operation of the VoIP service system according to the second embodiment of the present invention. FIG. 10 is a flowchart showing a destination search process used in the call control server of the VoIP service system according to the second embodiment of the present invention. Here, in FIG. 7, a case where an extension is transmitted from the terminal 31 belonging to the base 40 to the terminal 34 belonging to the base 42 will be described as an example. Note that the call control processing in the call control server 10 is substantially the same as the call control processing (see FIG. 5) of the first embodiment described above, and detailed description thereof is omitted here.

  The call control unit 15A of the call control server 10 executes the destination search process of FIG. 10 by the destination search unit 15B in the above-described step 101 of FIG. This incoming call destination search processing includes regular incoming call search processing (step 210) assuming that the incoming call destination telephone number specified in the outgoing call request is a normal extension number consisting of a base number and a terminal number, and the incoming call destination telephone number. Is an IP-PBX incoming call search process (step 230) that is assumed to be an incomplete extension including the terminal number of the unmanaged terminal.

First, the destination search means 15B refers to the extension / outside line conversion table 14A of the storage unit 14 as the regular incoming call search process (step 210), among the extension numbers registered in the extension / outside line conversion table 14A. Then, an extension number that matches the destination telephone number in all digits is searched (step 211).
Here, when an extension number that matches the destination telephone number in all digits is found (step 212: YES), the regular incoming call search process (step 210) is terminated and an external number corresponding to the extension number is obtained. Then, the call control means 15A is notified (step 201), and a series of destination search processing ends.

On the other hand, if an extension number that matches all digits of the destination telephone number is not found in step 212 (step 212: NO), the destination searching means 15B ends the regular incoming call search processing (step 210), IP-PBX incoming search processing (step 230) is started.
First, the last digit of the destination telephone number is deleted to change (adjust) the number of digits (step 231), and the extension / outer line conversion table 14A of the storage unit 14 is referred to and registered in the extension / outer line conversion table 14A. Of the extension numbers that have been set, the extension number that matches the changed destination telephone number in all digits is searched again (step 232).

If an extension number that matches the changed destination telephone number in all digits is found (step 232: YES), the destination telephone number is set to IP-PBX based on the terminal type corresponding to the extension number. Whether or not (step 233). If the destination telephone number is IP-PBX (step 233: YES), the IP-PBX incoming search process (step 230) is terminated, an external line number corresponding to the extension number is acquired, and the call control means 15A (Step 201), and the series of destination search processing ends.
If the destination telephone number is not IP-PBX (step 232: NO), the process returns to step 231 and the IP-PBX incoming search process is repeated until the destination telephone number becomes one digit (step 234: YES). Execute.

  On the other hand, in step 234, when an extension number that matches the changed destination telephone number in all digits is not found, and the number of digits of the destination telephone number is one digit or less (step 234: NO), the destination search means 15B ends the IP-PBX incoming call search process (step 230), notifies the call control means 15A of the incoming call destination search failure (step 202), and ends a series of incoming call destination search processes.

  Thus, in the present embodiment, the call control server 10 manages the extension / external line conversion table in association with the extension number consisting only of the base number of the IP-PBX 25 and the representative external number of the IP-PBX 25, and receives the destination. In the search means 15B, assuming that the destination telephone number specified in the call request from the terminal is an incomplete extension number, the number of digits of the destination telephone number is changed. The number of digits is changed by deleting the digits, and the extension / outside line conversion table 14A is searched with the changed destination telephone number to obtain the external number corresponding to the destination telephone number, that is, the representative external number of the IP-PBX 25 It is what you do.

  When this re-search is performed, the number of digits of the destination telephone number is changed by deleting the last digit of the destination telephone number, and the extension number that matches the changed destination telephone number with all the digits is obtained. If it is not found, the change and search are repeated, so a normal extension number consisting of the base number and extension number and an incomplete extension number with an unmanaged terminal number under IP-PBX are received. Even when the destination telephone numbers are used in a mixed manner, the destination telephone number can be analyzed flexibly to obtain a desired outside line number.

  Therefore, even when the rules for assigning extension numbers at each site are different and the number of digits of the site number or terminal number is different, there is no need to manage the number of digits of the site number or terminal number for each site or for each terminal. The search processing for the destination telephone number is not complicated, and it is possible to avoid an increase in development cost and maintenance for system construction. Thereby, without using a complicated configuration, for each terminal at these bases, for example, an incoming call request to a terminal under the IP-PBX, a representative call function for receiving an external line representing the IP-PBX, etc. It is possible to provide a more advanced and easy-to-operate extension transmission function.

  Further, in the present embodiment, a desired outside line number is obtained in the regular incoming call search process (step 210) assuming that the destination telephone number specified in the call request is a regular extension number composed of the base number and the terminal number. IP-PBX incoming search processing (step 230) assuming that the destination telephone number is an incomplete extension including the terminal number of the unmanaged terminal when the call is not obtained. Is used in preference to the processing result of the IP-PBX incoming search processing, so that each terminal can be called accurately by using a normal extension number. It is possible to reliably provide the extension transmission function to the user.

In this embodiment, the case where the IP-PBX incoming search process is executed after the regular incoming call search process has been described as an example. However, these processes are executed in parallel, and a desired outside line number is obtained by the regular incoming call search process. In such a case, the external line number is preferentially used, and the external line number obtained in the IP-PBX incoming search process is used only when the desired external line number is not obtained in the regular incoming call search process. Good.
In the case of giving priority to the representative call function of calling the representative external line number of the IP-PBX when calling the extension to the unmanaged terminal over the extension call function using the normal extension number, the normal incoming call search process and the IP-PBX The processing result of the IP-PBX incoming search processing may be used in preference to the processing result of the regular incoming search processing such as changing the processing order with the incoming search processing.

[Third Embodiment]
Next, a VoIP service system according to the third embodiment of the present invention will be described with reference to FIG. FIG. 11 is a flowchart showing a destination search process used in the call control server of the VoIP service system according to the third embodiment of the present invention. The configuration of the VoIP service system according to the third embodiment of the present invention is the same as that of the second embodiment (see FIG. 7) described above, and a description thereof is omitted here. The configuration of the call control server 10 according to the third embodiment of the present invention is the same as that of the first embodiment (see FIG. 2) described above, and a description thereof is omitted here.

In the present embodiment, as the destination search processing in the call control server 10, the regular incoming search processing (step 210) and the intra-site incoming search processing (step 220) in the first embodiment described above, This is a combination of the IP-PBX incoming search processing (step 230) of the embodiment.
It is assumed that the storage unit 14 of the call control server 10 includes the extension / external line conversion table 14A (FIG. 8) and the external line / extension conversion table 14B (FIG. 9) described in the second embodiment.

[Operation of Third Embodiment]
Next, with reference to FIG. 11, the destination search process executed by the call control server 10 will be described as an operation of the VoIP service system according to the third embodiment of the present invention. Note that the call control processing in the call control server 10 is substantially the same as the call control processing (see FIG. 5) of the first embodiment described above, and detailed description thereof is omitted here.

  The call control unit 15A of the call control server 10 executes the destination search process of FIG. 11 by the destination search unit 15B in step 101 of FIG. This incoming call destination search processing includes regular incoming call search processing (step 210) assuming that the incoming call destination telephone number specified in the outgoing call request is a normal extension number consisting of a base number and a terminal number, and the incoming call destination telephone number. Intra-site incoming call search processing (step 220) assuming that is an incomplete extension consisting only of terminal numbers, and that the destination telephone number is an incomplete extension including the terminal number of an unmanaged terminal IP-PBX incoming search processing (step 230).

The incoming call destination search means 15B first executes regular incoming call search processing (step 210), and if an extension number that matches all digits of the incoming call destination telephone number is found (step 212: YES), the normal incoming call search processing (step 212) Step 210) is ended, the external line number corresponding to the extension number is acquired and notified to the call control means 15A (Step 201), and a series of destination search processing ends.
On the other hand, if an extension number that matches all digits of the destination telephone number is not found in step 212 (step 212: NO), the destination searching means 15B ends the regular incoming call search processing (step 210), Intra-site incoming search processing (step 220) is started.

  At this time, if an extension number that matches all the digits with the destination telephone number whose number of digits has been changed (adjusted) by adding the originating base number to the head of the destination telephone number is found (step 222: YES) Based on the terminal type corresponding to the extension number, it is determined whether or not the destination telephone number is IP-PBX (step 223). If the destination telephone number is not IP-PBX (step 223: NO), the in-site incoming search process (step 220) is terminated, an external number corresponding to the extension number is acquired, and the call control means 15A is obtained. Notification is made (step 201), and the series of destination search processing ends.

If the destination telephone number is IP-PBX in step 223 (step 223: NO), the destination telephone number is not an extension number from which the base number is omitted. Continue.
On the other hand, if no extension number that matches the changed destination telephone number in all digits is found in step 222 (step 222: NO), the destination searching means 15B ends the intra-site incoming search processing (step 220). After that, the IP-PBX incoming search process (step 230) is started.

Here, an extension number that matches all the digits with the destination phone number that has been changed (adjusted) by deleting the last digit of the destination phone number is found (step 232: YES), and the destination phone number is IP In the case of -PBX (step 233: YES), the IP-PBX incoming call retrieval process (step 230) is terminated, the external line number corresponding to the extension number is acquired and notified to the call control means 15A (step 201), Finishes the destination search process.
If the destination telephone number is not IP-PBX (step 232: NO), the process returns to step 231 and the IP-PBX incoming search process is repeated until the destination telephone number becomes one digit (step 234: YES). Execute.

  On the other hand, in step 234, when an extension number that matches the changed destination telephone number in all digits is not found, and the number of digits of the destination telephone number is one digit or less (step 234: NO), the destination search means 15B ends the IP-PBX incoming call search process (step 230), notifies the call control means 15A of the incoming call destination search failure (step 202), and ends a series of incoming call destination search processes.

  In the present embodiment, a desired outside line number is obtained in the regular incoming call search process (step 210) assuming that the destination telephone number specified in the outgoing call request is a regular extension number consisting of a base number and a terminal number. If it is not, an intra-site incoming search process (step 220) assuming that the destination telephone number is an incomplete extension consisting of only a terminal number is performed, and a desired external number cannot be obtained by this process. If the call destination telephone number is an incomplete extension including the terminal number of the unmanaged terminal, an IP-PBX incoming search process (step 230) is performed. Since it is used in preference to the processing results of the intra-site incoming search processing and the IP-PBX incoming search processing, each terminal is accurately called by using a normal extension number. That it is possible, it can reliably provide to the user the original basic extension transmission function.

In the present embodiment, the case where the intra-site incoming call search process and the IP-PBX incoming call search process are executed after the normal incoming call search process has been described as an example. However, these processes are executed in parallel, and the normal incoming call search process is executed. If the desired outside line number is obtained, the outside line number is preferentially used, and only when the desired outside line number is not obtained by the regular incoming call retrieval process, the intra-site incoming line retrieval process or the IP-PBX incoming line retrieval is performed. You may make it use the external line number obtained by the process.
In addition, a base number omission function in which a base number can be omitted when an extension is transmitted to a terminal in the same base from an extension transmission function using a normal extension number, or a representative of the IP-PBX when an extension is transmitted to an unmanaged terminal When giving priority to the representative call function of calling an outside line number, the processing order of the regular incoming call search process, such as switching the order of the regular incoming call search process and the intra-site incoming call search process or the IP-PBX incoming search process, The processing result of the incoming search processing or the IP-PBX incoming search processing may be used with priority.

Further, in this embodiment, the processing result of the in-site incoming search processing is used in preference to the processing result of the IP-PBX incoming search processing, so that the representative of the IP-PBX when calling an extension to an unmanaged terminal Compared to the representative call function for rare cases of calling an outside line number, the user can use the base number omission function that is convenient and frequently used. Can be reliably provided.
In the case where priority is given to the representative call function over the base number omission function, the IP-PBX incoming search is performed based on the processing result of the intra-site incoming search processing, such as switching the processing order between the local incoming search processing and the IP-PBX incoming search processing. The processing result of the processing may be used with priority.

[Fourth Embodiment]
Next, a VoIP service system according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a block diagram showing the configuration of the VoIP service system according to the fourth embodiment of the present invention. In FIG. 12, the same or equivalent parts as those in FIG.
In this embodiment, the functions of the call control server 10 used in the first embodiment are distributed to the call control server 10A for accommodating users and the call control server 10C for extension management that are connected hierarchically. The case where it does is demonstrated.

  In FIG. 12, the call control server 10 </ b> A is a call control server for accommodating users (hereinafter referred to as a user accommodation server) that is connected to the IP network 20 and accommodates the terminals 31 and 32 disposed at the base 40. . The call control server 10B is a user accommodation call control server (hereinafter referred to as a user accommodation server) that is connected to the IP network 20 and accommodates each terminal 33 arranged at the base 41. The call control server 10C is an extension management call control server (hereinafter referred to as an extension management server) that is connected to the user accommodation servers 10A and 10B and collectively manages the extension numbers of the terminals 31 to 33 of the bases 40 and 41. is there.

  In the present embodiment, of the call control server 10 (see FIG. 2) of the first embodiment described above, a configuration related to the call control function is provided in the user accommodation servers 10A and 10B, and a configuration related to the destination search function is an extension. It is provided in the management server 10C. Therefore, the user accommodation servers 10A and 10B do not have the extension / outside line conversion table 14A in the storage unit 14 and do not have the destination detection means 15B in the control unit 15 in the call control server 10 (see FIG. 2). At this time, the outside line / internal line conversion table 14B has only information regarding the terminals accommodated in the respective user accommodation servers 10A and 10B. Further, the extension management server 10C does not have the external line / extension conversion table 14B in the storage unit 14 and does not have the call control means 15A in the control unit 15 in the call control server 10 (see FIG. 2).

[Operation of Fourth Embodiment]
Next, with reference to FIG. 13, the transmission processing operation of the VoIP service system according to the fourth embodiment of the present invention will be described. FIG. 13 is a sequence diagram showing an outgoing call processing operation of the VoIP service system according to the fourth embodiment of the present invention. Here, in FIG. 12, a case where an extension is transmitted from the terminal 31 belonging to the base 40 to the terminal 33 belonging to the base 41 will be described as an example.

In response to the user's extension call operation, the terminal 31 sends a call request with the destination telephone number designated by the operation as the call destination information and the external line number of the terminal 31 as the caller information. To the user accommodation server 10A (step 120).
The control unit 15 of the user accommodation server 10A receives a call request from the terminal 31 via the communication I / F unit 11, and analyzes the call request by the call control unit 15A. If the call request is an extension call, a call destination search request including the call destination telephone number and the base number of the terminal 31, that is, the caller base number is transmitted to the extension management server 10C (step 121).
At this time, the calling site number is acquired from the external line / extension conversion table 14B based on the external line number of the caller terminal 31.

The control unit 15 of the extension management server 10C receives the destination search request from the user accommodation server 10A via the communication I / F unit 11, and receives the destination telephone number and the calling site number included in the destination search request. Based on the above, the destination search means 15B searches for an outside line number corresponding to the destination telephone number (step 122). Then, the obtained outside line number is returned to the user accommodation server 10A as the destination information (step 123).
At this time, the destination search unit 15B uses the destination search process described in any of the first to third embodiments described above to use the external line corresponding to the destination telephone number included in the destination search request. Get the number.

The call control means 15A of the user accommodation server 10A searches the external line / extension conversion table 14B for the external line number notified as the destination information from the internal line management server 10C, and if it is not found, determines that the terminal is not a terminal under its control. Then, a connection request is transmitted to the other user accommodation server 10B including the external line number of the caller terminal 31 and the external line number of the call destination (step 124).
At this time, for the destination of the connection request, the external line number accommodated by each user accommodation server is managed by the extension management server 10C, each user accommodation server 10A, 10B, or another server, and corresponds to the external line number. May be transmitted to the user accommodation server, and the connection request may be transferred in order at each user accommodation server.

In response to the connection request from the user accommodation server 10A, the call control means 15A of the user accommodation server 10B searches the external line / extension conversion table 14B for the external line number specified in the connection request, and receives an incoming call corresponding to the external line number. Destination terminal Here, the IP address of the terminal 33 is acquired (step 125).
Then, a connection request using the external line number of the caller terminal 31 as the caller information and the callee terminal 33 as the callee information is sent from the communication I / F unit 11 via the IP network 20 based on the IP address. It transmits to the terminal 33 (step 126).

In response to a connection request from the call control server 10, the terminal 33 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 127). A response is notified to the call control server 10 in response to a response operation by the person (step 128).
The response from the terminal 33 is notified to the user accommodation server 10A via the user accommodation server 10B (step 129), and further notified from the user accommodation server 10A to the originating terminal 31 (step 130).

As a result, an RTP (Real-time Transport Protocol) session is established between the terminal 31 and the terminal 33 via the IP network 20, VoIP voice communication is started (step 131), and a series of steps in the VoIP service system is performed. The outgoing call processing operation ends.
In step 122, if the outside telephone number corresponding to the destination telephone number cannot be acquired, the extension management server 10C notifies the user accommodation server 10A of a search failure, and the user accommodation server 10A responds accordingly to the terminal. The disconnection indicating the extension transmission failure is notified to 31, and the series of transmission processing operations is completed.

  As described above, in the present embodiment, the call control server 10 used in the first embodiment described above is replaced with the call control servers 10A and 10B for accommodating users that are hierarchically connected and the call control server for extension management. Since it is distributed to the server 10C, each of the user accommodation servers 10A and 10B only needs to manage information related to the terminals accommodated by itself and execute only the call control processing relating to these terminals. Further, the extension management server 10C only needs to centrally manage only information related to the extension of each terminal and execute only the extension destination search process.

  Therefore, it is possible to simplify the configuration required by specializing the functions in each server, and to greatly reduce the processing load. As a result, the user accommodation function in the VoIP service system can be easily distributed to a plurality of user accommodation servers, and it is easy for diversified systems such as an increase in the number of terminals, an increase in the number of locations, and a complicated terminal management form In addition, each base can be integrated with extensions.

In particular, in the case of providing a single voice VPN service by integrating the bases accommodated in different user accommodation servers, it is possible to cope with this by simply modifying the extension / outside line conversion table of the extension management server.
As a result, it is no longer necessary to accommodate each site with a single user accommodation server, and work required when the accommodation destination of the site is changed, for example, correspondence information between the user accommodation server and the external line number of each terminal is changed. This eliminates the need for a new voice VPN service.

In this embodiment, the case where each user accommodation server manages one site has been described as an example, but a plurality of sites may be managed by one user accommodation server. Moreover, although the case where a terminal is accommodated in each user accommodation server has been described as an example, an IP-PBX can be accommodated instead of a terminal as in the second embodiment described above.
Each user accommodation server and the extension management server may be connected by a dedicated IP network, or may be a public IP network such as the Internet, or an IP network 20. The same applies to connections between user accommodation servers.

[Extended embodiment]
In each of the above-described embodiments, the case where each base is managed by one call control server 10 and further managed by two user accommodating servers 10A and 10B and one extension management server 10C has been described as an example. The number of these call control servers and user accommodation servers can be flexibly increased / decreased according to the configuration of each terminal and base, and the same effects as described above can be obtained.
Also, a plurality of extension management servers 10C are provided, and the addresses of these extension management servers are managed by each user accommodation server. Based on various information such as the voice VPN group to which the caller terminal belongs and the destination telephone number, these users are managed. The accommodation servers may be used in a distributed manner.

  The call control packet exchanged between the call control server 10 and the user accommodation servers 10A and 10B and the terminal has a very small amount of data and delay is not a problem. Furthermore, VoIP voice communication uses the call control server. Since the communication band secured in the IP network 20 is used without going through, the call control server 10 and the user accommodation servers 10A and 10B are external IP networks (not shown) connected to the IP network 20 via the WAN line. It is also possible to perform call control of each terminal via the WAN line and the external IP network.

  In addition, the extension / external line conversion table 14A and the external line / extension conversion table 14B add and manage the voice VPN group number corresponding to each entry, and when searching for the external line number from the destination telephone number, and from the external line number When searching for an IP address, only the entry of the same voice VPN group number as the source terminal may be searched. Thereby, each server can be shared and call control for a plurality of different voice VPN groups can be performed, and the VoIP service system can be used efficiently.

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 an example of a structure of the extension / outside line conversion table used with the VoIP service system concerning the 1st Embodiment of this invention. It is an example of a structure of the external line / extension conversion table used with the VoIP service system concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the transmission processing operation | movement of the VoIP service system concerning the 1st Embodiment of this invention. It is a flowchart which shows the called party search process used with the call control server of the VoIP service system concerning the 1st Embodiment of this invention. It is a block diagram which shows the structure of the VoIP service system concerning the 2nd Embodiment of this invention. It is an example of a structure of the extension / outside line conversion table used with the VoIP service system concerning the 2nd Embodiment of this invention. It is an example of a structure of the external line / extension conversion table used with the VoIP service system concerning the 2nd Embodiment of this invention. It is a flowchart which shows the incoming call destination search process used with the call control server of the VoIP service system concerning the 2nd Embodiment of this invention. It is a flowchart which shows the incoming call destination search process used with the call control server of the VoIP service system concerning the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the VoIP service system concerning the 4th Embodiment of this invention. It is a sequence diagram which shows the transmission processing operation | movement of the VoIP service system concerning the 4th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Call control server, 10A, 10B ... User accommodation server, 10C ... Extension management 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 / internal conversion table, 14P ... program, 15 ... control unit, 15A ... call control means, 15B ... destination search means, 20 ... IP network, 25 ... IP-PBX, 31-35 ... terminal, 40-42 ... base.

Claims (6)

For a plurality of terminals installed at each site and transmitting / receiving voice packets via the IP network, the call control server performs call control of these terminals, thereby realizing voice communication with the terminals using the IP network. A VoIP service system,
The call control server
For each terminal, an extension number consisting of a base number having an arbitrary number of digits identifying the base of the terminal and a terminal number having an arbitrary number of digits identifying the terminal within the base is associated with an external number of the terminal The internal / external line conversion table to manage
From among the extension numbers in the extension / outline conversion table, an extension number that matches in all digits with the destination telephone number of an arbitrary number of digits included in the outgoing call request is searched, and is associated with the matched extension number. A destination search means for obtaining an outside line number;
In response to a call request from the terminal, an external line number corresponding to the destination telephone number specified in the call request is acquired by the destination search means, and an IP address of the terminal corresponding to the external line number is acquired. A VoIP service system comprising: call control means for performing transmission processing to the terminal. In the VoIP service system according to claim 1,
As the call control server, a user accommodation server that performs call control of each terminal via the IP network, and an extension management server that is connected to the user accommodation server and manages the extension number of each terminal,
The extension management server includes the extension / outside line conversion table and the destination search means.
In response to a search request from the user accommodation server, an external line number corresponding to the destination telephone number specified in the search request is searched and notified,
The user accommodation server has the call control means, requests the extension management server to search for an extension number corresponding to the destination telephone number specified in the call request from the terminal, and notifies the extension management server of the request. A VoIP service system characterized in that a call processing to a terminal corresponding to the outside line number is performed. A call control server that realizes voice communication with the terminal using the IP network by performing call control of these terminals for a plurality of terminals that are installed at each site and transmit / receive voice packets via the IP network. There,
For each terminal, an extension number consisting of a base number having an arbitrary number of digits identifying the base of the terminal and a terminal number having an arbitrary number of digits identifying the terminal in the base is associated with an external number of the terminal The internal / external line conversion table to manage
From among the extension numbers in the extension / outline conversion table, an extension number that matches in all digits with the destination telephone number of an arbitrary number of digits included in the outgoing call request is searched, and is associated with the matched extension number. A destination search means for obtaining an outside line number;
In response to a call request from the terminal, an external line number corresponding to the destination telephone number specified in the call request is acquired by the destination search means, and an IP address of the terminal corresponding to the external line number is acquired. A call control server, comprising: call control means for performing a call origination process to the terminal. A user accommodation server that realizes voice communication with the terminal using the IP network by performing call control of these terminals for a plurality of terminals that are provided at each site and transmit / receive voice packets via the IP network; A call control server connected to search for an external line number of a terminal corresponding to a destination telephone number specified in the destination search request in response to a destination search request from the user accommodation server;
For each terminal, an extension number consisting of a base number having an arbitrary number of digits identifying the base of the terminal and a terminal number having an arbitrary number of digits identifying the terminal within the base is associated with an external number of the terminal The internal / external line conversion table to manage
From among the extension numbers in the extension / outline conversion table, an extension number that matches in all digits with the destination telephone number of any number of digits included in the destination search request is searched, and the extension number that matches is searched. A call control server comprising: a destination search means for acquiring an associated external line number and notifying the user accommodation server. A call control method for realizing voice communication with the terminal using the IP network in a call control server for a plurality of terminals that are provided at each site and transmit / receive voice packets via the IP network,
An extension number consisting of a base number having an arbitrary number of digits identifying the base of the terminal and a terminal number having an arbitrary number of digits identifying the terminal within the base by the call control server and the terminal A management step for associating and managing an external line number with an extension / external line conversion table,
The call control server searches the extension number in the extension / outside line conversion table for an extension number that matches in all digits with the destination telephone number of an arbitrary number of digits included in the outgoing call request, and the matched extension A destination search step for obtaining an external number associated with the number;
In response to a call request from the terminal, the call control server obtains an external line number corresponding to the destination telephone number specified in the call request by the destination search step, and the terminal corresponding to the external line number A call control method comprising: a call control step of acquiring an IP address and performing a call origination process to the terminal. A user accommodation server that realizes voice communication with the terminal using the IP network by performing call control of these terminals for a plurality of terminals that are provided at each site and transmit / receive voice packets via the IP network; In this call control method, a connected call control server searches for an external line number of a terminal corresponding to a destination telephone number specified in the destination search request in response to a destination search request from the user accommodation server. And
An extension number consisting of a base number having an arbitrary number of digits identifying the base of the terminal and a terminal number having an arbitrary number of digits identifying the terminal within the base by the call control server and the terminal A management step for associating and managing an external line number with an extension / external line conversion table,
The call control server searches for an extension number that matches in all digits with the destination telephone number of any number of digits included in the destination search request from among the extension numbers of the extension / external line conversion table, A call control method comprising: a destination search step of acquiring an external number associated with the matched extension number and notifying the user accommodation server.