JP4823111B2 - IP telephone data relay program, IP telephone data relay server, and IP telephone system - Google Patents

Description

  The present invention relates to a technology for relaying data while performing cooperation processing between active and standby data relay servers that relay IP telephone call data.

  In an IP telephone system that realizes an IP telephone between terminals, a configuration in which a call is realized by linking a call control server that controls call establishment and release and a data relay server that relays call data is generally adopted. Has been. Such a system employs a configuration in which the data relay servers are multiplexed by the active and standby data relay servers in case a failure occurs in the data relay server.

In such a conventional IP telephone system, the active and standby data relay servers are provided with call information databases for holding call information established between IP telephone terminals, respectively, and Japanese Patent Application Laid-Open No. 59-148492. As shown, the call information held in the call information database of the active data relay server is transmitted and reflected in the call information database of the standby data relay server every predetermined time. When a failure occurs in the active data relay server and a switch to the standby system is performed, the call state is continued using the call information held in the call information database of the standby data relay server. .
JP 59-148492 A

  However, in the prior art, when a failure occurs in the active data relay server and the switching to the standby system is performed, the following problems occur. In other words, since the call information held in the active call information database is transmitted to the standby data relay server only at predetermined time intervals, the latest call information is held in the standby data relay server when a failure occurs. The data relay process could not be taken over normally. For example, when call information is transmitted from the active data relay server to the standby data relay server every 2 seconds, a call that has occurred for a maximum of 2 seconds due to switching from the active system to the standby system is performed. All the information was lost and the call related to these calls was disconnected. For these calls, it is necessary to disconnect the call and re-establish the call.

  In order to solve this problem, instead of reflecting the call information in the active call information database to the standby system every predetermined time, both the active system and the standby system each time a call establishment request or release request occurs. A method of establishing or releasing a call after updating the call information database in FIG. However, in this method, since it takes time to establish or release a call, in particular, a delay in the establishment of the call causes an inconvenience that the waiting time from the start of the call to the start of the call becomes long. .

  Therefore, in view of the above-described conventional problems, the present invention provides a data relay server for an IP telephone in which data relay servers are multiplexed. The purpose is to realize high reliability by preventing a call from being disconnected as much as possible even if it occurs.

  Therefore, in the present invention, a call information database for holding call information established between IP telephone terminals and a temporary database for holding update information of the call information database are provided and transmitted between IP telephone terminals. In a network computing environment constructed by including a plurality of data relay servers that can be arbitrarily set to either the active system or the standby system, the data relay server set as the active system is provided When the call information of the call establishment request or the deletion request is received, the call information database is updated based on the call information, and the call information database update information is immediately permitted to establish or release the call. While sending to other data relay servers set as standby system, call information database every predetermined time It reads the call information to the other data relay server set as the standby system. When the data relay server set as the standby system receives update information, it updates the temporary database based on the update information, while receiving call information from the call information database of the active data relay server. In addition, the call information database is updated based on the call information, and all the update information in the temporary database is deleted. In addition, when a failure occurs in another data relay server set as the active system, the data relay server set as the standby system updates the call information database based on the update information of the temporary database and switches to the active system. It is characterized by.

  According to the present invention, call information held in the call information database of the active data relay server is transmitted to the standby data relay server every predetermined time and reflected in the call information database of the standby data relay server. In addition, every time a call establishment request or release request occurs at the IP telephone terminal, the call information database of the active data relay server is updated and the update information is transmitted to the standby data relay server, Update the temporary database on the standby data relay server. For this reason, call information of a call that occurs after the call information database is reflected from the active system to the standby system every predetermined time can be held by the standby data relay server. Further, when a failure occurs in the active data relay server, the standby data relay server reflects the update information of the temporary database in the call information database. Therefore, even if a failure occurs in the active data relay server, the standby call information database can be brought into the same state as the active call information database at the time of failure, that is, the latest state. Therefore, it is difficult to disconnect the call that was connected when the failure occurred, and the call data can be continuously relayed. The active data relay server establishes a call without waiting for the call information to be reflected on the standby data relay server when call establishment request or release request call information is received from the call control server. Or, since the release is permitted, the time until the call is established or released is also short. Therefore, high reliability can be realized without delaying call establishment or release.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows the configuration of an IP telephone system embodying the present invention. This IP telephone system includes a call control server 10 that establishes or releases a call in an IP telephone, a first data relay server 20 and a second data relay server 30 that relay telephone telephone call data, and an IP telephone that makes an IP telephone call. A telephone terminal 40 is included. Here, the first data relay server 20 and the second data relay server 30 have the same hardware configuration, and one operates as an active system and the other as a standby system according to settings. The call control server 10, the first data relay server 20, the second data relay server 30, and the IP telephone terminal 40 are connected to each other via a network. Then, a call is established and released through the network between the call control server 10 and the IP telephone terminal 40. Further, call information is transmitted through a network among the call control server 10, the first data relay server 20, and the second data relay server 30. Further, call data is transmitted through the network between the IP telephone terminal 40 and the first data relay server 20 and the second data relay server 30. Note that the call data is not limited to data in which sound is converted, and may include, for example, video data associated with a call.

  The call control server 10 is implemented by a SIP (Session Initiation Protocol) server or the like, and is configured by a computer including at least a central processing unit (CPU), a memory, and an external storage device. When a call establishment request or release request is received from the IP telephone terminal 40, the IP addresses and ports of the calling and called IP telephone terminals 40 are specified and transmitted to the active data relay server. Here, the IP address and port conversion necessity information between the calling side and called side IP telephone terminals 40 are transmitted together. Further, when receiving a response permitting the establishment or release of a call from the active data relay server and the IP addresses and ports of the calling and called sides after conversion as necessary, the calling A call is established or released between the IP telephone terminal 40 on the receiving side and the called side.

  The first data relay server 20 and the second data relay server 30 are configured by a computer including at least a CPU, a memory, and an external storage device. FIG. 2 shows an outline of functions of the first data relay server 20. The first data relay server 20 includes a call information database (DB) 20A for holding call information established in the IP telephone terminal 40, and a temporary DB 20B for holding update information of the call information DB 20A (in these DBs). Details will be described later). When the data relay program is executed, the following functions are realized according to the setting of operating the data relay server as the active system or the standby system. That is, only when operating as the active system, while communicating with the call control server 10 and receiving call information, the call control cooperation unit 20C that performs processing such as updating the call information DB 20A based on the call information, the active system Only when operating as a data relay unit 20D for relaying call data between IP telephone terminals 40, and when operating as an active system, call information is transmitted to a standby data relay server, while operating as a standby system In this case, the function of the multiplexing linkage unit 20E that updates the call information DB 20A and the temporary DB 20B with call information received from the active data relay server is realized.

  As shown in FIG. 3, the call information DB 20A includes a call information identifier for uniquely specifying call information, an IP address and a calling side terminal information indicating the IP address and port of the calling side IP telephone terminal 40, Called terminal information indicating the IP address and port of the IP telephone terminal 40, address conversion necessity indicating whether or not the IP address and port need to be converted, and IP address and port need to be converted Calling party conversion information converted so that the caller's IP address and port can be recognized by the called party, and called party conversion information converted so that the caller's IP address and port can be recognized by the calling party It is comprised including.

  As shown in FIG. 4, the temporary DB 20B includes an update type indicating whether call information has been added to the call information DB 20A or deleted from the call information DB 20A, call information identifier, calling terminal information, called terminal information, and address. It includes conversion necessity / unnecessity, calling side conversion information, and called side conversion information.

  Similarly, the second data relay server 30 includes a call information database 30A, a temporary DB 30B, a call control cooperation unit 30C, a data relay unit 30D, and a multiplexing cooperation unit 30E. Since these functions are the same as those of the call information database 20A, temporary DB 20B, call control cooperation unit 20C, data relay unit 20D, and multiplexing cooperation unit 20E, description thereof will be omitted.

  Hereinafter, referring to FIG. 5, when the first data relay server 20 is set as the active system, the second data relay server 30 is set as the standby system, and the first data relay server 20 is operating normally, the IP telephone system The overall flow of the processing executed in step 1 will be described. In FIG. 5, the non-functioning part is not displayed (the same applies hereinafter).

  When a call establishment request or release request is issued from the calling side IP telephone terminal 40 (1), the call control server 10 sets the IP addresses and ports of the calling side and called side IP telephone terminals 40. The call information is identified and transmitted to the call control cooperation unit 20C of the first data relay server 20 (2). The call control cooperation unit 20C updates the call information DB 20A based on the call information received from the call control server 10 (3), and notifies the multiplexing cooperation unit 20E of the update information of the call information DB 20A (4). Then, a response permitting the establishment or release of the call is returned to the call control server 10 (5), and the call control server 10 receiving this response transmits the call information to the IP telephone terminal 40 on the called side (6). ). Furthermore, in the call control server 10, when a response is returned from the called IP telephone terminal 40 (7), this response is transmitted to the calling IP telephone terminal 40 (8) to establish or release the call. To do. Then, the call data is transmitted from the IP telephone terminal 40 on the calling side to the data relay unit 20D of the first data relay server (9), and the data relay unit 20D refers to the call information DB 20A and adds the received call data to the data relay unit 20D. It is confirmed whether or not call information matching the included call information exists in the call information DB 20A (10). If call information matching the call information included in the call data exists in the call information DB 20A, the call data is relayed to the IP telephone terminal 40 on the called side (11). If not, the call is established. The call data is discarded as not being made.

  When the update information of the call information DB 20A is notified to the multiplexing cooperation unit 20E in (4), the multiplexing cooperation unit 20E sends the notified update information to the multiplexing cooperation unit 30E of the second data relay server 30. Transmit (12). Then, the multiplexing cooperation unit 30E updates the temporary DB 30B based on the received update information (13). On the other hand, the multiplexing cooperation unit 20E reads the call information in the call information DB 20A every predetermined time (14) and transmits it to the multiplexing cooperation unit 30E (15). When receiving the call information in the call information DB 20A, the multiplexing link unit 30E updates the call information DB 30A based on the call information (16) and deletes all the call information in the temporary DB 30B.

  Here, with reference to FIG. 5, FIGS. 3, 4 and 4 showing call information in the call information DB 20A, the call information DB 30A, and the temporary DB 30B mainly for specific processing in the multiplexing linkage unit 20E and the multiplexing linkage unit 30E. This will be described with reference to FIG.

  Assume that call information having call information identifiers “1”, “2”, and “3” is held in the call information DB 20A at a certain timing as shown in FIG. Then, the call information is read by the multiplexing cooperation unit 20E every predetermined time (14) and transmitted to the multiplexing cooperation unit 30E (15). When the multiplexing cooperation unit 30E updates the call information DB 30A based on the call information. (16). Then, the call information stored in the call information DB 30A matches the call information stored in the call information DB 20A, that is, the state shown in FIG. Here, if a call establishment request is transmitted in the IP telephone terminal 40 after a predetermined time has elapsed from this processing until the next processing (15) and (16) is performed, the call control cooperation unit In 20C, when this call information (call information identifier is “4”) is received from the call control server 10 (2), it is added to the call control DB 20A as shown in FIG. 6 (3). On the other hand, when this call information is notified to the multiplexing linkage unit 20E (4), and when the multiplexing linkage unit 20E transmits this call information to the multiplexing linkage unit 30E (13), the multiplexing linkage unit 30E shows in FIG. As shown, the call information with the call information identifier “4” is added to the temporary DB 20B together with the update type indicating that it has been added to the call information DB 20A. Next, when a release request is sent for the call having the call information identifier “1” in the IP telephone terminal 40, the call control cooperation unit 20C similarly performs call information as shown in FIG. In addition to deleting this call information from the DB 20A, as shown in FIG. 4, the multiplexing linkage unit 30E indicates that the call information with the call information identifier “1” has been deleted from the call information DB 20A in the temporary DB 30B. Add with update type. Here, the call information DB 30A remains in the state shown in FIG. 3 until the processing of (15) and (16) is performed after a predetermined time has elapsed, and then the processing of (15) and (16) is performed. When this is done, the multiplexing link unit 30E reflects the state of the call information DB 20A, that is, the state of FIG. 6 in the call information DB 30A, and deletes the call information in the temporary DB 30B.

  Next, each processing content will be described in detail.

  FIG. 7 shows the processing contents of the call control cooperation process executed by the call control cooperation unit 20C of the first data relay server 20. This process is executed every time call information of a call establishment request or a deletion request is received from the call control server 10. The call information received from the call control server 10 includes a call information identifier, calling terminal information, called terminal information, and address conversion availability information.

  In step 1 (abbreviated as “S1” in the figure, the same applies hereinafter), it is determined whether or not the call information is a call establishment request. If it is call information of a call establishment request, the process proceeds to step 2 (Yes), and if it is not call information of a call establishment request (that is, a release request), the process proceeds to step 3 (No).

  In step 2, the call information identifier of the received call information, the calling side terminal information, the called side terminal information, and the necessity of address conversion are added to the call information DB 20A.

  In step 3, call information whose call information identifier (or calling side terminal information and called side terminal information) matches among the call information held in the call information DB 20A is deleted from the call information DB 20A. To do.

  In step 4, the multiplex coordinating unit 20E is notified of the update information with the update type added to the received call information.

  In step 5, a response permitting establishment or release of the call is returned to the call control server 10. The call control server 10 establishes or releases the call when this reply is made.

  With this process, every time a call establishment request or release request is received from the call control server 10, the call information is reflected in the call information DB 20A. Therefore, the call information held in the call information DB 20A is This matches the call information of the call established in the server 10. Further, since the call is established or released without waiting for the call information to be reflected on the second data relay server 30 as the standby system, the call can be quickly established or released. Further, every time the call information DB 20A is updated, the update information is notified to the multiplexing linkage unit 20E, so that the multiplexing linkage unit 20E sends the update information to the second data relay server 30 as a standby system. Be able to send.

  By the way, IP telephone terminals 40 may use different IP address formats and ports. For example, there is a case where the calling IP telephone terminal 40 uses IPv4 and the called IP telephone terminal 40 uses IPv6. In such a case, information indicating that the address conversion is necessary is added to the call control server 10 as to whether the address conversion of the call information is necessary, and both the IP telephone terminals 40 recognize the information in the call control cooperation unit 20C that has received the information. The address and port are converted into a possible format and written in the caller side conversion information and the callee side conversion information in the call information DB 20A. Then, the conversion information is notified to the multiplexing linkage unit 20E, and the call control server Reply to 10. In this way, it is possible to realize a call between various types of IP telephone terminals.

  FIG. 8 shows a call information synchronous transmission process executed by the multiplexing cooperation unit 20E. This process is executed each time call information is received from the call control cooperation unit 20C.

  In step 11, the update information received from the call control cooperation unit 20C is transmitted to the multiplexing cooperation unit 30E of the second data relay server 30 as the standby system.

  With this call information synchronous transmission process, every time a call establishment request or release request is generated in the IP telephone terminal 40 and the call information DB 20A is updated, the update information in the call information DB 20A is used as a standby system. Can be sent to.

  Note that the call control cooperation process and the call information synchronization transmission process correspond to the active system synchronization processing means.

  FIG. 9 shows a call information DB transmission process executed by the multiplexing cooperation unit 20E. This process is executed at predetermined intervals by a timer (not shown) provided in the first data processing device 20.

  In step 21, all call information in the call information DB 20A is read.

  In step 22, the difference information between the call information (not shown) held at the time of reading the previous call information DB 20A and the call information read this time is extracted.

  In step 23, the difference information is transmitted to the multiplexing cooperation unit 30E of the second data relay server 30.

  By such call information DB transmission processing, call information registered in the call information DB 20A, that is, call information currently established in the call control server 10, can be transmitted to the second data relay server 30 as a standby system. it can. Also, by transmitting only the difference information from the previous reading of the call information DB 20A, it is possible to reduce the load on the network traffic as compared with the case where all the call information in the call information DB 20A is transmitted.

  The call information DB transmission process corresponds to the working asynchronous processing means.

  FIG. 10 shows data relay processing executed by the data relay unit 20D. This process is executed every time call data is received from the IP telephone terminal 40.

  In step 31, with reference to the call control DB 20A, call information in which the calling side terminal information and the called side terminal information of the call information included in the received call data match the calling side terminal information and the called side terminal information are matched. It is determined whether or not it exists, that is, whether or not a call is established in the call control server 10. If the corresponding call information exists in the call information DB 20A, the process proceeds to step 32 (Yes), and if the corresponding call information does not exist in the call information DB 20A, the process proceeds to step 33 (No).

  In step 32, the call data between the IP telephone terminals 40 is relayed. At this time, if conversion information is written in the caller side conversion information and the callee side conversion information of the call control DB 20A, the IP address and the port are converted as necessary using these conversion information, and the call is made. Relay data.

  In step 33, the received call data is discarded.

  With this process, it is possible to perform data relay only for calls established in the call control server 10 and realize a call between the IP telephone terminals 40.

  Generally, call information notified from the call control server 10 may be incomplete. For example, there is a case where a port used by the calling side IP telephone terminal 40 is undecided. In such a case, when the data relay unit 20D relays the call data, the call information in the call information DB 20A is supplemented based on the call information included in the call data.

  FIG. 11 shows a temporary DB update process that is executed every time the multiplexing linkage unit 30E of the second data relay server 30 receives update information transmitted from the multiplexing linkage unit 20E for each call establishment request or release request. Indicates.

  In step 41, the received update information, that is, update type, call information identifier, calling side terminal information, called side terminal information, necessity of address conversion, calling side conversion information, and called side conversion information are stored in the temporary DB 30B. Add to.

  With this temporary DB update process, every time a call establishment request or release request is transmitted in the IP telephone terminal 40, the call information can be held in the second data relay server as a standby system.

  The temporary DB update process corresponds to a standby system synchronization processing unit. Further, the call control cooperation process, the call information synchronous transmission process, and the temporary DB update process correspond to the synchronization processing means.

  FIG. 12 shows a standby call information DB update process that is executed each time the multiplexing cooperation unit 30E receives call information (difference information) in the call information DB 20A from the multiplexing cooperation unit 20E every predetermined time.

  In step 51, the call information DB 31 is updated based on the received call information (difference information) in the call information DB 20A.

  In step 52, all update information in the temporary DB 30B is deleted. Here, this processing is due to the fact that the call information DB 20A and the call information DB 30A match because the call information DB 30B is updated with the received call information, so that the update information registered in the temporary DB 30B becomes unnecessary. It is.

  With this standby call information DB update process, the call information in the call information DB 20A of the first data relay server 20 as the active system is reflected in the call information DB 30A of the second data relay server 30 as the standby system. The call information in the information DB 30A becomes the latest.

  The standby call information DB update processing corresponds to backup asynchronous processing means. In addition, the call information DB transmission process and the standby call information DB update process correspond to an asynchronous processing means.

  Next, referring to FIG. 13, when a failure occurs in the first data relay server 20 and the second data relay server is switched from the standby system to the active system, the entire processing executed in the IP telephone data relay device The flow will be described.

  The multiplexing cooperation unit 30E reads all the call information in the temporary DB 30B (17) and reflects it in the call information DB 30A (18). The call control cooperation unit 30C starts communication with the call control server 10 (19), while the data relay unit 30D starts communication with each IP telephone terminal 40, and the call information in the call information DB 20A is reflected. The call information DB 30A is referred to (20) to perform data relay ((21) and (22)).

  Furthermore, each processing content is demonstrated in detail.

  FIG. 14 shows a switching process by the multiplexing cooperation unit 30E. This process is executed when the second data relay server 30 detects that a failure has occurred in the first data relay server 20.

  In step 61, one piece of update information is read from the temporary DB 30B.

  In step 62, it is determined whether or not the read call information is added to the call information DB 20A based on the update type of the read update information. If the read call information is added to the call information DB 20A, the process proceeds to step 63 (Yes), and if the read call information is not added to the call information DB 20A, the process proceeds to step 64 (No).

  In step 63, the call information identifier, calling side terminal information, called side terminal information, address conversion necessity / unnecessity, calling side conversion information and called side conversion information of the read update information are added to the call information DB 30A.

  In Step 64, call information whose call information identifier (or calling side terminal information and called side terminal information) matches with the read update information is deleted from the call information DB 30A among the call information held in the call information DB 20A. To do.

  In step 65, it is determined whether or not all the update information registered in the temporary DB 30B has been read. If all the items have been read, the process proceeds to step 66 (Yes), and if all the items have not been read, the process returns to step 61 (No).

  In step 66, all update information registered in the temporary DB 30B is deleted.

  Such switching processing corresponds to switching means.

  According to the switching process, the call information DB 30A reflecting the call information of the call information DB 20A every predetermined time is further changed to the first data relay server 20 after the previous standby call information DB update process. It is possible to reflect call information of a call establishment request or a deletion request that has occurred up to the time of failure. Therefore, no matter what timing the failure of the first data relay server 20 occurs, the call information DB 30A can be matched with the call information DB 20A at the time of the failure, and the call information in the call information DB 30A is updated. can do.

  Furthermore, when the switching process is completed, the call control cooperation unit 30C starts communication with the call control server 10 instead of the call control cooperation unit 20C. Similarly, when the switching call information reflection process is completed, the data relay unit 30D starts relaying data between the IP telephone terminals 40 instead of the multiplexing link unit 20E. Here, since the call information of the call established in the call control server 10 is held in the call information DB 30A and is in the latest state by the switching process, data relay can be normally performed. Note that the processes of the call control cooperation unit 30C and the data relay unit 30D are the same as the processes of the call control cooperation unit 20C and the data relay unit 20D, respectively, and thus description thereof is omitted here.

  Therefore, conventionally, when a failure occurs in the first data relay server 20, a call established after the last call information DB reflection processing before the failure and before the failure occurs in the standby system. Since the call information cannot be held, it becomes impossible to cooperate with the call control server 10 and the call connection by those calls has to be disconnected. However, since the call connection is difficult to be disconnected, the call connection is stable. Will be. In addition, the call information cooperation unit 20C returns a response that permits the call control server to establish or release the call without waiting for the reflection processing of the call information to the second data relay server 30. The time to release is short. Therefore, it is possible to realize high reliability of the call without delaying the establishment or release of the call.

  In this embodiment, one backup data relay apparatus is used, but a plurality of data relay apparatuses may be used.

Configuration diagram of an IP telephone system embodying the present invention Data relay server function overview Explanatory drawing of call information DB Explanatory drawing of temporary DB Outline diagram of processing flow of IP telephone system when first data relay server is operating normally Explanatory drawing of call information DB Flow chart showing call control linkage processing Flowchart showing call information synchronous transmission processing Flow chart showing call information DB transmission processing Flow chart showing data relay processing Flow chart showing temporary DB update processing Flowchart showing standby call information DB update processing Outline diagram of the processing flow of the IP telephone system when a failure occurs in the first data relay server Flow chart showing the switching process

Explanation of symbols

10 call control server 20 first data relay device 20A call information DB
20B Temporary DB
20C Call control link unit 20D Data relay unit 20E Multiplex link unit 30 Second data relay device 30A Call information DB
30B Temporary DB
30C Call control cooperation part 30D Data relay part 30E Multiplexing cooperation part 40 IP telephone terminal

Claims (6)

A call information database for holding call information established between IP telephone terminals and a temporary database for holding update information of the call information database, and means for relaying data transmitted between IP telephone terminals In a network computing environment constructed by including a plurality of data relay servers that can be arbitrarily set to either the active system or the standby system,
The data relay server set as the active system
When call information of a call establishment request or a deletion request is received, the call information database is updated based on the call information, and the call information database is immediately permitted to be established or released, and the call information database is updated. Active system synchronization processing means for transmitting information to another data relay server set as a standby system;
Active system asynchronous processing means for reading call information in the call information database and transmitting it to another data relay server set as a standby system at predetermined time intervals;
While functioning as
The data relay server set as the standby system
When the update information transmitted by the active system synchronization processing means is received, the standby system synchronization processing means for updating the temporary database based on the update information;
When the call information transmitted by the active asynchronous processing means is received, the call information database is updated based on the call information, and the standby asynchronous processing means for deleting all the update information of the temporary database;
Switching means for updating the call information database based on the update information of the temporary database and switching to the active system when a failure occurs in another data relay server set as the active system;
An IP telephone data relay program characterized in that it functions as The call information includes calling-side terminal information and called-side terminal information for specifying the calling-side and called-side IP telephone terminals, respectively.
When the active synchronization processing means receives the call information of the call establishment request, it adds the calling terminal information and the called terminal information of the call information to the call information database, while the call release request When the call information is received, call information in which the received call information matches the calling terminal information and the called terminal information is deleted from the call information held in the call information database. The IP telephone data relay program according to claim 1. The active asynchronous processing means is
When the call information is read from the call information database, difference information from the previously read call information is extracted, and only the difference information is transmitted to another data relay server set as a standby system. The IP telephone data relay program according to claim 1 or 2. The data relay server set as the active system
When the IP address format that can be recognized by the calling IP phone terminal is different from that of the called IP phone terminal, the IP address format of the calling IP phone terminal can be recognized by the calling IP phone terminal 4. The method according to claim 1, further comprising: converting means for converting the IP address of the called IP telephone terminal into a format recognizable by the calling IP telephone terminal. The IP telephone data relay program according to any one of the above. A call information database for holding call information established between IP telephone terminals and a temporary database for holding update information of the call information database, and means for relaying data transmitted between IP telephone terminals In a network computing environment constructed by including a plurality of data relay servers that can be arbitrarily set to either the active system or the standby system,
The data relay server set as the active system is
When call information of a call establishment request or a deletion request is received, the call information database is updated based on the call information, and the call information database is immediately permitted to be established or released, and the call information database is updated. Active system synchronization processing means for transmitting information to another data relay server set as a standby system;
Active system asynchronous processing means for reading call information in the call information database and transmitting it to another data relay server set as a standby system at predetermined time intervals;
Configured with
The data relay server set as the standby system
When the update information transmitted by the active system synchronization processing means is received, the standby system synchronization processing means for updating the temporary database based on the update information;
When the call information transmitted by the active asynchronous processing means is received, the call information database is updated based on the call information, and the standby asynchronous processing means for deleting all the update information of the temporary database;
Switching means for updating the call information database based on the update information of the temporary database and switching to the active system when a failure occurs in another data relay server set as the active system;
An IP telephone data relay server, comprising: A network computing environment constructed including a call control server for establishing and releasing a call between IP telephone terminals, and an active and standby data relay server for relaying data transmitted between IP telephone terminals In
A temporary database for holding the call information database for holding the call information established between the IP telephone terminals by the call control server and the update information of the call information database by the active and standby data relay servers With
Based on the call information of the call establishment request or deletion request transmitted from the call control server to the active data relay server, the call information database of the active data relay server is updated to establish or release the call. Synchronization processing means for immediately permitting the call control server to perform, and updating the temporary database of the standby data relay server based on update information of the call information database of the active data relay server;
The call information database of the active data relay server is read at predetermined time intervals, the call information database of the standby data relay server is updated based on the call information, and the standby data relay Asynchronous processing means to delete all update information of server temporary database,
When a failure occurs in the active data relay server, the call information database of the standby data relay server is updated based on the update information of the temporary database of the standby data relay server. Switching means for switching the data relay server to the active system;
An IP telephone system characterized by comprising:

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