JP2015192235A - Call control server, server shift system and call control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a time influential on services by relieving a call that cannot be incoming since REGISTER information of a terminal is not registered at a new call control server side in telephone service system replace.SOLUTION: The present invention includes: subscriber information storage means for acquiring from a first call control server and storing subscriber information relating to one or more terminals accommodated in the first call control server; state management information storage means for storing state management information indicating the state of shifting each subscriber information item from the first call control server for each telephone number of the terminal; and call connection control means which refers to the state management information on the basis of an incoming destination telephone number of an incoming call when the incoming call is received, confirms the shift state of subscriber information relating to an incoming destination, and performs call connection processing in accordance with a result of the confirmation.

Description

  The present invention relates to a call control server, a server migration system, and a call control program. For example, the present invention can be applied to a call control server, a server migration system, and a call control program when replacing an existing call control server with a new call control server. It is.

  For example, in an IP telephone service, there are various methods for switching from an existing call control server to a new call control server. When system replacement is performed, it is desired to continue the IP telephone service up to that time when switching the call control server.

  As a system replacement method in a conventional telephone service, there is a technique described in Patent Document 1, for example. Patent Document 1 describes a technique for continuing IP telephone service without interrupting a communication call when an incoming call is received when software of the IP telephone system is updated.

JP 2005-348143 A

  However, when switching the call control server in the conventional IP telephone service, the REGISTER information of the terminal cannot be transferred from the existing call control server to the new call control server, and an incoming call from another network cannot be received at the destination terminal Can occur.

  For example, in an IP telephone service employing SIP (Session Initiation Protocol), after switching an incoming call from another network from the existing call control server to the new call control server, the REGISTER registration destination of the terminal is changed from the existing call control server to the new call control server. When system replacement is performed in the procedure of switching to the control server, an incoming call from another network arrives at the new call control server in the process of replacement, but the terminal REGISTER information is registered only in the existing call control server. Therefore, there is a problem that the incoming call cannot be received from the new call control server to the subscriber terminal.

  Further, even when the REGISTER registration destination of the terminal is switched from the existing call control server to the new call control server, the terminal can receive a call while the REGISTER information of the terminal remains in the existing call control server, but the REGISTER information of the terminal However, there is a problem that incoming calls cannot be made when Expire.

  Furthermore, depending on the specifications of the terminal, incoming calls from other than the registration destination of REGISTER information may not be accepted, and there may be a problem that incoming calls cannot be received from the existing call control server when the registration destination of REGISTER information of the terminal is switched.

  Also, as work at the time of system replacement, the setting change of the accommodation station number information and the migration of the accommodated subscriber information in the existing call control server and the new call control server, the work of changing the terminal connection destination call control server, the routing change of the host call control server There is a problem that the amount of work is large and the work takes a long time.

  Therefore, at the time of system replacement of the telephone service, call control that can relieve a call that cannot be received because the REGISTER information of the terminal is not registered on the new call control server side, and can shorten the service influence time. There is a need for servers, server migration systems, and call control programs.

  In order to solve such a problem, the first aspect of the present invention provides: (1) one or a plurality of terminals accommodated in the first call control server in the call control server to which the function of the first call control server is transferred And (2) a first call for each subscriber information for each telephone number of one or more terminals. State management information storage means for storing state management information indicating the state of transition from the control server; and (3) when an incoming call is received during transition from the first call control server, the destination telephone number of the incoming call Call control server comprising: call connection control means for referring to the state management information based on the information, confirming the transition state of the subscriber information related to the destination, and performing call connection processing according to the confirmation result It is.

  The second aspect of the present invention includes (1) a first call control server, (2) a second call control server to which the function of the first call control server is transferred, and (3) one or a plurality of terminals. Status management information storage means for storing status management information indicating a transition status of each subscriber information related to one or a plurality of terminals accommodated by the first call control server from the first call control server for each telephone number When the second call control server receives an incoming call during the transition from the first call control server to the second call control server, the state management information is based on the destination telephone number of the incoming call. The server migration system is characterized in that the migration state of the subscriber information related to the called party is confirmed and call connection processing is performed according to the confirmation result.

  According to a third aspect of the present invention, there is provided a call control program as a transfer destination of functions of the first call control server, wherein: (1) subscriber information relating to one or a plurality of terminals accommodated in the first call control server; Subscriber information storage means for acquiring and storing the information from the first call control server, and (2) transition status of each subscriber information from the first call control server for each telephone number of one or a plurality of terminals State management information storage means for storing state management information indicating the state management information, and (3) when receiving an incoming call upon transition from the first call control server, state management information based on the destination telephone number of the incoming call The call control program is characterized in that it confirms the transition state of the subscriber information related to the called party and functions as call connection control means for performing call connection processing in accordance with the confirmation result.

  According to the present invention, when the IP telephone service system is replaced, a call that cannot be received because the REGISTER information of the terminal is not registered on the new call control server side can be relieved, and the service influence time is shortened. can do.

It is a block diagram which shows the system configuration | structure by the side of the ISP network which concerns on 1st Embodiment. It is a whole lineblock diagram showing the whole telephone system composition concerning a 1st embodiment. It is a block diagram which shows the structure of the state management table | surface which concerns on 1st Embodiment. It is a sequence diagram which shows the replacement process of the call control server in the IP telephone system which concerns on 1st Embodiment. It is a block diagram which shows the system configuration | structure by the side of the ISP network which concerns on 2nd Embodiment. It is a block diagram explaining the structure of the state management table | surface which concerns on 2nd Embodiment. It is a flowchart which shows a process when there exists a customer control call at the time of the switching in the new call control server which concerns on 2nd Embodiment. It is a flowchart which shows a process when there exists a customer control operation request | requirement at the time of the switch in the new WEB server which concerns on 2nd Embodiment.

(A) First Embodiment Hereinafter, a first embodiment of a call control server, a server migration system, and a call control program according to the present invention will be described in detail with reference to the drawings.

  The first embodiment exemplifies a case where the present invention is applied to a system transition of a telephone service that employs SIP.

(A-1) Configuration of the First Embodiment FIG. 2 is an overall configuration diagram showing the overall configuration of the telephone system according to the first embodiment.

  2, the telephone system 100 according to the first embodiment includes an ISP network 1, a call control server (C4SS) 8 as a class 4 soft switch, a call control server (C5SS) 3 as a class 5 soft switch, and a CPE. (Customer Premises Equipment) 2, a telephone terminal 12, another network 110, and a telephone terminal 120.

  The telephone system 100 according to the first embodiment communicates between a telephone terminal 12 that can be connected to the ISP network 1 and a telephone terminal 120 that can be connected to the other network 110 via the ISP network 1 and the other network 110. Is possible.

  The ISP network 1 is a communication network operated by an Internet service provider (ISP). A call control server (C4SS) 8 that functions as a relay device to another network 110 and a call control server (C5SS) 3 that accommodates a telephone terminal 12 that is a subscriber terminal are arranged on the ISP network 1. The telephone terminal 12 is accommodated in the call control server 3 via the CPE 2.

  The other network 110 is a communication network different from the ISP network 1, and the telephone terminal 120 is connected to the other network 110.

  In the first embodiment, a case where the call control server (C5SS) 3 of the ISP network 1 is switched to a new call control server is illustrated. Further, the case where the telephone terminal 120 of the other network 110 transmits a call to the telephone terminal accommodated in the call control server 3 at the time of system replacement is illustrated.

  FIG. 1 is a configuration diagram showing a system configuration on the ISP network 1 side according to the first embodiment.

  In FIG. 1, the ISP network 1 side includes a call control server (C4SS) 8, an existing call control server (C5SS) 3 and an existing database server 4 as an existing system, a new call control server (C5SS) 5 as a new system, and a new system. It has a database server 6. In FIG. 1, it is assumed that the existing system of the ISP network 1 is migrated to the new system.

  The ISP network 1 is a network using IP (Internet Protocol) as a communication protocol. An ISP that provides an Internet service is a carrier network that uses the ISP network 1 to provide an IP telephone service to a subscriber.

  The existing call control server (C5SS) 3 and the new call control server (C5SS) 5 have a function of performing call control for CPE and other call control servers using SIP. The existing call control server 3 and the new call control server 5 are both C5SS (Class 5 Soft Switch) and are positioned as subscriber accommodation switches. In this embodiment, it is assumed that the accommodated subscriber information is transferred in stages from the existing call control server 3 to the new call control server 5 and replaced.

  The new call control server 5 is arranged on the ISP network 1 when the call control server is switched, and when there is an incoming request from another network through the call control server (C4SS) at the time of switching. Referring to the state management table 7 to be described later, the destination transition state is confirmed, and when the destination is “before transition”, the received incoming request is transferred to the existing call control server 3. In other words, the REGISTER information related to the destination is not yet registered on the new system side, and in the state registered on the existing system side, the incoming request is transferred to the existing call control server 3 to the destination. Incoming calls can be made possible. On the other hand, after the REGISTER information related to the destination is registered on the new system side, the new call control server 5 refers to the REGISTER information of the destination registered in the new database server 6 and receives the incoming call to the destination. Is possible.

  The existing call control server 3 performs call connection with reference to the REGISTER information of the terminal registered in the existing database server 4 as usual before switching to the new call control server 5.

  During switching to the new call control server 5, the call control server 4 as a relay exchange with another network performs call connection with the new call control server 5. Therefore, when an incoming call request is transferred from the new call control server 5 during switching to the new call control server 5, the existing call control server 3 refers to the REGISTER information of the called party registered in the existing database server 4. Then, the incoming call processing to the called party is performed.

  The CPE2 has a function of connecting to an IP network, a function of connecting an analog telephone or PBX, a function of control signal processing for connecting to an analog telephone or PBX and realizing an IP telephone service, and a voice codec. is there. The type of physical line connecting the CPE 2 and the ISP network 1 is not limited, but it is assumed that a call control protocol and RTP (Real-time Transport Protocol) communication can be performed between the CPE 2 and the ISP network 1. The CPE 2 is accommodated in the existing call control server 3 before the call control server replacement work, and the registration destination of the REGISTER information is set in the existing call control server 3.

  The existing database server 4 and the new database server 6 have a function of storing information necessary for providing services such as subscriber information and routing information. Specifically, the REGISTER information of the subscriber terminal is stored in the existing database server 4, and the REGISER registration destination of the CPE 2 is switched to the new call control server 5 when moving from the existing system to the new system. Accordingly, REGISTER information is registered in the new database server 6. The existing call control server 3 operates the telephone service with reference to the existing database server 4, and the new call control server 5 operates the telephone service with reference to the new database server 6.

  The state management table 7 is information in which the transition state of each subscriber information when the subscriber information is migrated from the existing call control server 3 to the new call control server 5 is described. The state management table 7 suffices to exist on any server that constitutes the new system. In this embodiment, the state management table 7 is illustrated as being stored in the new database server 6. The status management table 7 is a table describing which system is currently handling subscriber information registered in the existing system and the new system. The subscriber's REGISTER registration destination is changed from the existing system to the new system. Along with the switching work, the migration status is changed by database operation.

  The call control server (C4SS) 8 is a relay exchange between another network and the ISP network 1 and performs call connection with the existing call control server 3, the new call control server 5, and other relay exchanges by a call control protocol. Is. The call control server (C4SS) 8 changes the connection destination C5SS from the existing call control server 3 to the new call control server at the first stage of switching from the existing call control server 3 to the new call control server 5 by replacing the call control server. Change the setting to 5. Thereby, when there is an incoming request from another network when the call control server is replaced, the incoming request can be transmitted to the new call control server 5.

  FIG. 3 is a configuration diagram showing the configuration of the state management table 7 according to the first embodiment. As illustrated in FIG. 3, the state management table 7 according to the first embodiment includes “phone number” and “status” as items.

  The status management table 7 manages the subscriber information of the subscribers accommodated in the service by the ISP by associating the “telephone number” with the “status”. When the new call control server 5 receives an incoming call, the new call control server 5 can change the call processing operation according to the status of the called subscriber by referring to the state management table 7.

  Here, the “telephone number” is searched by a longest match and does not necessarily have to be written in all digits. In the first embodiment, the “status” has two stages of “before migration” indicating before the transition to the new system and “transferred” indicating that the transition to the new system has been completed.

(A-2) Operation of the First Embodiment Next, the operation of the call control server replacement process in the IP telephone system according to the first embodiment will be described in detail with reference to the drawings.

  In this embodiment, when the IP telephone service is replaced, the transition state of the subscriber is managed by the state management table based on the telephone number of the accommodated subscriber in the new system, and the call processing operation is changed depending on the transition state of each subscriber. This explains how to reduce the service impact during replacement.

  FIG. 4 is a sequence diagram showing a replacement process of the call control server in the IP telephone system according to the first embodiment.

  For example, whether or not the new call control server 5 operates with reference to the state management table 7 is set by the apparatus itself. For example, in the new call control server 5, after setting the status management table 7 as a replacement work preparation, the status management table reference operation is turned ON (S101). Thereby, the new call control server 5 is set to operate with reference to the state management table 7. It is assumed that this ON / OFF setting is possible without restarting the apparatus.

  It is assumed that the telephone number of CPE2 is set as “before migration” in the state management table 7. An example will be described in which the call control server that accommodates the CPE 2 is switched from the existing call control server 3 to the new call control server 5 using this mechanism.

  First, the call control server (C4SS) 8 switches the incoming call to the CPE 2 from the existing call control server 3 to the new call control server 5 so that the CPE 2 incoming call is received by the new call control server 5 (S102).

  When an incoming call of CPE2 arrives at the call control server (C4SS) 8 (S103), the incoming call of CPE2 is given from the call control server (C4SS) 8 to the new call control server 5 (S104).

  When the new call control server 5 receives the CPE2 incoming call (S105), it refers to the state management table 7 and confirms the status of the term corresponding to the telephone number of the called subscriber, and according to the status and the REGISTER status of the called subscriber. Perform the action. In this case, information in which the status of the number band of CPE2 is “before migration” is acquired.

  Specifically, if the called subscriber is not REGISTER and the status in the state management table 7 is “before transition”, it is determined that the called subscriber is accommodated in the existing call control server 3 before switching. The new call control server 5 performs transfer to the existing call control server 3. On the other hand, if the called subscriber is in the REGISTER state, it is determined that the REGISTER destination has already been switched to the new call control server 5, and the new call control server 5 receives an incoming call from its own server regardless of the status in the state management table 7. Let

  That is, at the time of S105, the CPE 2 is “before migration”, and the REGISTER information of the CPE 2 is still registered only in the existing call control server 3. For this reason, the new call control server 5 does not have REGISTER information of the CPE 2 and cannot normally receive a call.

  However, in this embodiment, since the status of the state management table 7 is “pre-migration” and in the non-REGISTER state, the new call control server 5 sends the CPE2 incoming call to the existing call control server. 3 (S106). Thus, the existing call control server 3 that has received the transfer refers to the REGISTER information (S107), and performs an operation of connecting the incoming call to the CPE 2 (S108).

  In other words, the registration destination of the REGISTER information of CPE2 is the existing call control server 3, and the existing call control server 3 has the REGISTER information of CPE2. Therefore, the existing call control server 3 refers to the REGISTER information of CPE2. Thus, the incoming call processing for the incoming call destination can be made possible.

  Thereafter, the registration destination of the REGISTER information of CPE 2 is changed from the existing call control server 3 to the new call control server 5 (S109). As a result, the REGISTER information of CPE 2 is registered in the new call control server 5. Thereafter, even if there is an incoming call of CPE2, the incoming call of CPE2 is not transferred from the new call control server to the existing call control server 3, and the new call control server 5 is directly incoming to CPE2.

  Then, after the replacement work is completed, the state management table reference operation is turned off (S110).

(A-3) Effects of the First Embodiment As described above, according to the first embodiment, the actual service influence time depends on the terminal specifications, but this function is used when the IP telephone service system is replaced. A call that cannot be received due to the non-REGISTER state in the new call control server that is the migration destination can be relieved, and the service influence time can be shortened.

  Further, according to the first embodiment, even when it is necessary to perform the system replacement work within a limited time, the same accommodation station number information and subscriber data are the same in the existing call control server and the new call control server as a preliminary work. Can be registered, so there is no need to change the terminal accommodation on the call control server as a transition work on the subscriber side on the day of system replacement, and it is possible to change the setting of the connected call control server on the terminal side Thus, the amount of work can be reduced.

  Furthermore, since the routing can be changed for each subscriber according to the status of the status management table, the work on the new system side at the time of system replacement can be handled only by operating the status management table, regardless of the unit. It is possible to respond flexibly to the gradual transition of subscribers.

  In addition, the status change of the status management table on the new system side and the ON / OFF of the status management table reference operation on the new call control server can be performed without interruption of the service, and the system replacement work can be performed without affecting the service caused by the new call control server. It is.

(B) Second Embodiment Next, a second embodiment of the call control server, server migration system, and call control program according to the present invention will be described in detail with reference to the drawings.

  The second embodiment assumes system replacement of an IP telephone service that provides a transfer service.

(B-1) Configuration of Second Embodiment FIG. 5 is a configuration diagram showing a system configuration on the ISP network 1 side according to the second embodiment.

  5, the ISP network 1 according to the second embodiment includes a call control server (C4SS) 8, an existing call control server (C5SS) 3 as an existing system, an existing WEB server 9, an existing database server 4, and a new system. New call control server (C5SS) 5, new WEB server 10 and new database server 6. In FIG. 5, it is assumed that the existing system of the ISP network 1 is migrated to the new system.

  In the second embodiment, in addition to the configuration of FIG. 1 according to the first embodiment, a WEB server (WEB servers 9 and 10) is provided in order to provide a customer control function using a WEB browser.

  The existing WEB server 9 and the new WEB server 10 have a WEB server function for providing a WEB customer control function and a function for writing to and reading from a database server in response to a customer control request from a subscriber.

  Assuming that the WEB server that provides the WEB customer control function is migrated from the existing WEB server 9 to the new WEB server 10 when the subscribers are migrated in stages from the existing call control server 3 to the new call control server 5. Yes.

  The existing database server 4 and the new database server 6 manage customer control data related to subscribers in addition to the subscriber status described in the first embodiment (for example, REGISTER information of the subscriber terminal). is there.

  The existing call control server 3 and the new call control server 5 have a transfer service function and a customer control function by telephone in addition to the functions described in the first embodiment.

  The subscriber of CPE2 is a transfer service contractor. In the second embodiment, the type of call control protocol is not particularly limited.

  The call control server (C4SS) 8 changes the connection destination C5SS of the customer control call from the existing call control server 3 at the first stage of switching from the existing call control server 3 to the new call control server 5 by replacing the call control server. The setting is changed to the new call control server 5. As a result, the customer control call is connected from the call control server (C4SS) 8 to the new call control server 5. Similarly, the setting of the connection destination of the WEB customer control operation request is also changed from the existing WEB server 9 to the new WEB server 10 in the first stage of the switching work.

  Similarly to the first embodiment, the state management table 7A is information in which the transition state of the subscriber information is described in accordance with the replacement from the existing system to the new system. As in the first embodiment, the state management table 7A only needs to exist on one of the servers constituting the new system. In this embodiment, the state management table 7A is illustrated as being stored in the new database server 6. doing.

  FIG. 6 is a configuration diagram illustrating the configuration of the state management table 7A according to the second embodiment. As illustrated in FIG. 6, the state management table 7A according to the second embodiment includes “phone number” and “status” as items.

  The state management table 7A manages the subscriber information of the subscribers accommodated in the own service by the ISP by associating the “telephone number” with the “status”. “Telephone numbers” are searched for longest matches and do not necessarily have to be written in full digits. In the second embodiment, “status” indicates “before migration” indicating before the transition to the new system, “in transition” indicating that the existing system is being migrated to the new system, and indicates that the transition to the new system has been completed. Three stages of “Migrated”.

(B-2) Operation of Second Embodiment FIG. 7 is a flowchart showing processing when a customer control call is received at the time of switching in the new call control server 5 according to the second embodiment.

  When the new call control server 5 receives an incoming customer control call (S201), the new call control server 5 refers to the state management table 7A and confirms the status of the item corresponding to the telephone number of the customer control call operation subscriber (S202). The operation is performed according to the status.

  When the status in the status management table 7A of the subscriber is “before migration”, the new call control server 5 determines that the subscriber is before the transfer service and transfers the customer control call to the existing call control server 3. (S203). Then, customer control data is updated in the existing call control server 3 and the existing database 4.

  When the status in the status management table 7A of the corresponding subscriber is “migrating”, the new call control server 5 determines that the subscriber is a user who is migrating customer control data, and connects to the guidance to update customer control data. Is suppressed (S204).

  When the status in the status management table 7 of the subscriber is “transferred”, the subscriber determines that the transfer service has been transferred, and the customer control data is updated by the new call control server 5 and the database server 6 (S205). ).

  FIG. 8 is a flowchart showing processing when a customer control operation request is made during switching in the new WEB server 10 according to the second embodiment.

  When the new WEB server 10 receives an operation request for WEB customer control (S301), the new WEB server 10 refers to the state management table 7A based on the telephone number of the connected user (S302). Confirm the status and perform the operation according to the status.

  When the status in the status management table 7A of the corresponding subscriber is “before migration”, the new WEB server 10 determines that the subscriber is before the transfer service, and the new WEB server 10 sends the WEB customer control operation request to the existing WEB server. 9 (S303). Customer control data is updated by the existing WEB server 9 and the existing database server 4.

  When the status in the status management table 7A of the corresponding subscriber is “in transition”, the new WEB server 10 determines that the subscriber is a user in the transition of customer control data, transitions to the maintenance screen, and updates the customer control data. Suppress (S304).

  When the status in the status management table 7A of the subscriber is “transferred”, the subscriber determines that the transfer service has been transferred, and the customer control data is updated by the new WEB server 10 and the database server 6 (S305).

  The new call control server 5 and the new WEB server 10 refer to the state management table 7A to determine whether or not to perform an operation related to a customer control call incoming operation and a customer control operation request. As a preparation, after setting the state management table 7A, the state management table reference operation is turned ON, and after the replacement work is completed, the reference operation of the state management table 7A is turned OFF. It should be noted that the ON / OFF setting of the state management table 7A reference operation can be performed without restarting the apparatus.

  The case where the call control server and the WEB server that provide the transfer service to the CPE 2 using this mechanism are switched from the existing call control server 3 to the new call control server 5 and from the existing WEB server 9 to the new WEB server 10 will be described as an example. To do.

  The CPE 2 is provided with a transfer service by the existing call control server 3, and when receiving an incoming call addressed to the CPE 2, the transfer operation is performed with reference to the customer control information of the existing database server 4.

  The new call control server 5 is set to operate with reference to the state management table 7A, and all telephone numbers including CPE2 are set as “before migration” in the state management table 7A.

  First, all the connection destinations of the customer control call and the WEB customer control operation request are changed from the existing call control server 3 and the existing WEB server 9 to the new call control server 5 and the new WEB server 10.

  At this time, since the state management table 7A is all set to “before migration”, the customer control call is transferred from the new call control server 5 to the existing call control server 3, and the customer control information is updated in the existing database server 4. The

  The WEB customer control operation request is transferred from the new WEB server 10 to the existing WEB server 9, and the existing database server 4 updates the customer control information.

  Subsequently, for the migration target subscriber (here, CPE2), the status of the state management table 7A is changed to “being migrated” by the operation of the new database server 6. Thereby, the transfer of the customer control call and the WEB customer control operation request is stopped, and the update by the existing database server 4 is suppressed.

  At the same time, in the case of “migrating”, the update of the new database server 6 in the new system is also suppressed. Therefore, the customer control data is migrated from the existing database server 4 to the new database server 6 in this state. During this time as well, an incoming call from the call control server 8 to the CPE 2 arrives at the call existing call control server 3 and a transfer operation is performed using the customer control information of the existing database server 4.

  Finally, the connection destination of the incoming call to the CPE 2 is switched from the existing call control server 3 to the new call control server 5.

  Further, the status of the state management table 7A is changed to “Migrated” for the CPE2 by the operation of the new database server 6. Thereby, the customer control call and the WEB customer control operation request are processed by the new call control server 5 and the new WEB server 10, and the new database server 6 is updated.

(B-3) Effects of the Second Embodiment As described above, according to the second embodiment, the actual service influence time depends on the terminal specifications, but this function allows customer control requests by telephone and WEB operations. Transfer to the existing system, update suppression, update suppression and update start in the new system can be controlled, and system transfer including customer control data transfer from the existing system to the new system can be flexibly handled. It is possible to eliminate the service influence on the user due to the customer control data mismatch before and after.

  In addition, since the routing and customer control request control can be changed for each subscriber according to the status of the status management table, the work on the new system side at the time of system replacement is the same as the status management table regardless of the unit. Only the operation is required, and it is possible to flexibly cope with the gradual transition of accommodating subscribers.

(C) Other Embodiments Although various modified embodiments have been mentioned in the above-described embodiments, the present invention can also be applied to the following modified embodiments.

  In the first and second embodiments, an example of shifting from an existing system to a new system has been described. However, when the number of accommodated subscribers increases in the call control server of the operating system, a new call control server is installed. The present invention can also be applied to a case where a part of the accommodated subscriber is moved to the new call control server.

  DESCRIPTION OF SYMBOLS 1 ... ISP network, 2 ... CPE, 3 ... Existing call control server (C5SS), 4 ... Existing database server, 5 ... New call control server (C5SS), 6 ... New database server, 7 ... Status management table, 8 ... Call Control server (C4SS), 9 ... existing WEB server, 10 ... new WEB server.

Claims (6)

In the call control server to which the function of the first call control server is transferred,
Subscriber information storage means for acquiring and storing subscriber information relating to one or more terminals accommodated by the first call control server from the first call control server;
State management information storage means for storing state management information indicating a transition state of each subscriber information from the first call control server for each telephone number of the one or more terminals;
When an incoming call is received during the transition from the first call control server, the state management information is referred to based on the destination telephone number of the incoming call, and the transition state of the subscriber information related to the destination is confirmed. And a call connection control means for performing a call connection process according to the confirmation result.   The call connection control means refers to the state management information, and forwards the received incoming call to the first call control server when the destination subscriber information corresponding to the destination telephone number is not changed. The call control server according to claim 1.   The call connection control means refers to the state management information, and when the destination subscriber information corresponding to the destination telephone number has been transferred, the call connection control means refers to the subscriber information storage means and receives the incoming call. The call control server according to claim 1, wherein:   The call connection control means refers to the state management information, and suppresses updating to the subscriber information storage means when the destination subscriber information corresponding to the destination telephone number is in transition. The call control server according to claim 1, wherein the call control server is provided. A first call control server;
A second call control server to which the function of the first call control server is transferred;
For each telephone number of the one or more terminals, state management information indicating a transition state from the first call control server of each subscriber information related to the one or more terminals accommodated by the first call control server. A state management information storage means for storing,
The second call control server is
When an incoming call is received during the transition from the first call control server to the second call control server, the state management information is referred to based on the destination telephone number of the incoming call, and the subscription related to the destination is received. Server migration system characterized by confirming the migration status of user information and performing call connection processing according to the confirmation result In the call control program to which the function of the first call control server is transferred,
Computer
Subscriber information storage means for acquiring and storing subscriber information relating to one or more terminals accommodated by the first call control server from the first call control server;
State management information storage means for storing state management information indicating a transition state of each subscriber information from the first call control server for each telephone number of the one or more terminals;
When an incoming call is received during the transition from the first call control server, the state management information is referred to based on the destination telephone number of the incoming call, and the transition state of the subscriber information related to the destination is confirmed. And a call control program that functions as call connection control means for performing call connection processing according to the confirmation result.

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