JP2011166253A - Call connection method, program and system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To add a representative handling service inexpensively to an IP (Internet Protocol) telephone network capable of being call-connected. <P>SOLUTION: A number response part 23 of an AS 2 uses as a retrieval key, the representative number of a call connection request notified from a service determination part 13 of a subscriber server 1 to acquire the list of telephone numbers of termination terminals corresponding to the representative number of a retrieval key as a candidate number list, and responds to the subscriber server 1 which has notified the representative number of the call connection request. A line selection part 14 of the subscriber server 1 selects one telephone number of the termination terminal from the candidate number list, and performs call termination control. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a call connection method, a call connection program, and a call connection system.

  The representative service, which is one of the telephone services, is a free line among a plurality of connection candidate lines (also called child lines) associated with the representative number when the calling terminal dials the representative number. This is a service that selects one called terminal and realizes connection of a call (call: connection through which voice data of the telephone flows) with the called terminal (Non-patent Document 1). As a result, since the caller of the calling terminal needs to store only one representative number, the representative handling service is suitable for a call center operation that accommodates many called terminals.

  On the other hand, in the telecommunications industry, as a main application on NGN (Next Generation Network), examination and popularization of IP (Internet Protocol) telephone technology has become active. The IP telephone is a technology that converts voice codes into IP packets and distributes them through an IP network (Non-Patent Documents 2 and 3).

  In a circuit switched telephone network (PSTN: Public Switched Telephone Networks), it is necessary to occupy a circuit path for each call, whereas in an IP telephone, a single circuit path is shared by a plurality of calls. Therefore, for the carrier providing the IP telephone, the equipment cost can be reduced because the equipment efficiency (line use efficiency) is good. Furthermore, the line usage fee can be reduced for IP telephone users.

NTT East, “Product Overview (Representative Service)”, [online], [Search January 12, 2010], Internet (URL: http://www.ntt-east.co.jp/50list/summary/ ) Osaka University, “NGN (Next Generation Network) Objectives and Future”, [online], [Search January 12, 2010], Internet (URL: http://www.ane.cmc.osaka-u.ac) .jp / ~ hasegawa / 2008-aiin / 20081217-murakami.pdf) NTT-AT, “Easy Explanation“ Next Generation Network (NGN) Technology ””, [online], [searched on January 12, 2010], Internet (URL: http://shop.ntt-at.co.jp) / takumi / cat199 /)

  However, although communication at the basic call level is being established as the current IP telephone technology, technology relating to additional services for telephones such as representative handling services has not yet been established. If a circuit-switched telephone network device (non-IP device) that has already realized additional telephone services is adopted as it is as an IP device, the introduction cost and operation cost for replacing the device will be a large burden, Not realistic.

  Therefore, it is possible to add a representative handling service at a low cost while making use of a call control device as an established IP device for basic call level communication, from both the operation side of the communication carrier and the usage side of the user. It has been demanded.

  Accordingly, the main object of the present invention is to solve the above-described problems and to add a representative handling service at a low cost to an IP telephone network capable of call connection.

  In order to solve the above problems, the present invention is a call connection method by a call connection system for establishing a call connection between the calling terminal and the called terminal by a call connection request from the calling terminal to the called terminal, A representative number is designated as the destination in the call connection request from the calling terminal, and the call connection request is relayed to the IP telephone network serving as a route for the call connection request from the calling terminal to the called terminal. A subscriber server is connected to an application server that responds to the subscriber server with the telephone number of the called terminal associated with the representative number, and the subscriber server includes a service determination unit, a line selection unit, an incoming call A control unit, wherein the service determination unit determines whether the telephone number specified in the received call connection request is a target of a representative service, and the representative service is determined as a result of the determination. The application server is notified of the representative number of the call connection request that is the target of the request, requests a telephone number list corresponding to the representative number, and the line selection unit receives the representative number as a request result of the service determination unit. When receiving from the application server a candidate number list that is a list of the telephone numbers of the called terminals corresponding to the selected number, the telephone number of the called terminal that is not in use is selected from the candidate number list as a called number, and the incoming call control unit However, the received call connection request is transferred to the called terminal to which the incoming call number selected by the line selection unit is assigned, and the application server includes a number response unit and a storage unit. The storage means of the application server stores correspondence information between the representative number and the telephone number of the called terminal, and the number response. Using the representative number of the call connection request notified from the service determination unit as a search key, and using the correspondence information stored in the storage means as a list of telephone numbers of the called terminals corresponding to the representative number of the search key It is acquired as a number list and responds to the subscriber server that has notified the representative number of the call connection request.

  Thus, by using an existing subscriber server as it is, a representative service can be added at low cost to an IP telephone network capable of call connection. The process of selecting the incoming call number from the candidate number list is executed on the subscriber server side.

  According to the present invention, the number responding unit includes a telephone number that constitutes the candidate number list as a telephone number of the called terminal corresponding to the representative number of the search key, and a representative different from the representative number of the search key. In response to the subscriber server after including a temporary representative number that is a number, when the line selection unit is using all the telephone numbers of the called terminals constituting the candidate number list, the candidate number list The call connection request having the temporary representative number that constitutes the new representative number as a new representative number is transferred to another subscriber server that handles the temporary representative number.

  This allows a predetermined subscriber to set a representative number across a plurality of subscriber servers, so that even if all the connection candidate numbers of a predetermined subscriber server are in use, connection candidates of another subscriber server Since the number can be utilized, the success probability of call connection in the representative service can be increased.

  The present invention is a call connection method by a call connection system for establishing a call connection between the calling terminal and the called terminal by a call connection request from the calling terminal to the called terminal, wherein the call connection from the calling terminal In the request, a representative number is designated as a destination, and an IP telephone network serving as a route of the call connection request from the calling terminal to the called terminal includes a subscriber server that relays the call connection request, and the representative number And an application server that responds to the subscriber server with the telephone number of the called terminal associated with the subscriber server, the subscriber server having a service determination unit and an incoming call control unit, and the service determination unit, It is determined whether or not the telephone number specified in the received call connection request is a target of a representative handling service, and a representative number of the call connection request that is a target of the representative handling service is determined as a result of the determination. To the application server, requesting a telephone number list corresponding to the representative number, and the incoming call control unit to the called terminal to which the incoming call number received as a response to the service determination unit is assigned The received call connection request is transferred, and the application server includes a number response unit, a line selection unit, and a storage unit. The storage unit of the application server includes the representative number and the incoming call number. The correspondence information between the telephone number of the terminal and the usage state of the telephone number of the called terminal is stored, and the number response unit uses the representative number of the call connection request notified from the service determination unit as a search key, From the correspondence information of the storage means, a list of the telephone numbers of the called terminal corresponding to the representative number of the search key is obtained as the candidate number list, and the line selection unit, From the candidate number list acquired by the serial number response unit, refer to the usage state stored in the storage means, and select the telephone number of the called terminal included in the candidate number list that is not in use as the incoming number. And responding to the subscriber server that has notified the representative number of the call connection request.

  Thus, by using an existing subscriber server as it is, a representative service can be added at low cost to an IP telephone network capable of call connection. Note that the process of selecting an incoming call number from the candidate number list is executed on the application server side.

  In the present invention, the storage means of the application server further stores a list of representative numbers to be used for each user, and the line selection unit uses all the telephone numbers of the called terminals constituting the candidate number list. When the medium is in use, the temporary representative number which is another representative number for the same user who uses the representative number of the search key is retrieved from the storage means and notified to the subscriber server, and the subscriber server A call connection request having the temporary representative number as a new representative number is transferred to another subscriber server that handles the temporary representative number.

  This allows a predetermined subscriber to set a representative number across a plurality of subscriber servers, so that even if all the connection candidate numbers of a predetermined subscriber server are in use, connection candidates of another subscriber server Since the number can be utilized, the success probability of call connection in the representative service can be increased.

  The present invention is characterized in that the application server further changes correspondence information between the representative number searched by the number response unit and the telephone number of the called terminal for each use time zone.

  Thereby, since the representative handling service is set for each usage time zone, it is possible to provide the representative handling service in accordance with the usage mode such as the business hours of the store.

  Furthermore, the present invention is a call connection program for executing each call connection method described above. Furthermore, the present invention is a call connection system configured by executing each call connection method described above.

  According to the present invention, it is possible to add a representative handling service at a low cost to an IP telephone network capable of call connection.

It is a block diagram which shows the IP telephone network of 1st Embodiment of this invention. It is a block diagram which shows the detail of the apparatus which comprises the IP telephone network of FIG. 1 regarding 1st Embodiment of this invention. It is a flowchart which shows the call connection process (there is no redirection) which the IP telephone network of 1st Embodiment of this invention performs. It is a block diagram which shows the IP telephone network of 1st Embodiment of this invention. It is a flowchart which shows the call connection process (with redirection) which the IP telephone network of 1st Embodiment of this invention performs. It is a flowchart which shows the continuation (with redirection) of the process of FIG. 5 regarding 1st Embodiment of this invention. It is a block diagram which shows the detail of the apparatus which comprises the IP telephone network regarding 2nd Embodiment of this invention. It is a flowchart of the call connection process (no redirection) regarding 2nd Embodiment of this invention. It is a flowchart of the call connection process (with redirection) regarding 2nd Embodiment of this invention. It is a block diagram which shows the implementation | achievement form of the representative handling service in the circuit switching telephone network as a comparative example.

Hereinafter, first and second embodiments of the present invention will be described in detail with reference to the drawings.
The first embodiment of the present invention is a form in which the incoming call destination number is determined on the subscriber server side.
The second embodiment of the present invention is a mode in which an incoming call destination number is determined on the application side.

FIG. 1 is a configuration diagram showing an IP telephone network according to the first embodiment. This IP telephone network system is a system for realizing a representative handling service in an IP telephone network (VoIP: Voice over Internet Protocol).
The network system includes the subscriber server 1, the AS 2, the relay server 3 (3a), the IP conversion device 4, the calling terminal 8, and the called terminals 9 (9a to 9c). Each device constituting these network systems includes a CPU that executes various programs, a memory that is a storage area into which various programs are read, storage means (such as a hard disk) that is a storage destination of various tables, and communication means. (Network interface).
In FIG. 1, the call connection flow from the calling terminal 8 to the called terminal 9 is indicated by a broken line arrow with the call connection route. The IP telephone network of FIG. 1 operates as a call routing system that determines each call connection route (broken arrow) by using each device as a component as a node.

The calling terminal 8 is a telephone terminal that accepts a dial of the representative number from the caller, and transmits a call request signal for the representative number to the IP conversion device 4 that is the accommodation destination based on the accepted dial. The transmission request signal to be transmitted is, for example, an SIP (Session Initiation Protocol) INVITE message.
The relay server 3 is a server that performs relay call processing, and relays a call request signal received from the subscriber server 1 to another subscriber server 1. The relay server 3 selects the subscriber server 1 that accommodates the representative number specified by the call request signal as a relay destination in this relay processing. Further, when the relay server 3 receives a response signal to the call request signal from the subscriber server 1, the relay server 3 transfers the response signal to the subscriber server 1 that accommodates the calling terminal 8.

The subscriber server 1 is a server that performs subscriber call processing as a subordinate device of the relay server 3. The subscriber server 1 accommodates the IP conversion device 4 as a lower device.
The IP conversion device 4 is a device that performs a conversion process from a non-IP signal to an IP signal and a conversion process from an IP signal to a non-IP signal. By arranging this IP conversion device 4 at a relay point between the non-IP network and the IP network, the device of the existing general subscriber is accommodated in the IP network.
The non-IP signal is a call control signal and a main signal (voice signal) transmitted through an electrical interface of an existing analog / ISDN (Integrated Services Digital Network) terminal. The IP signal is a voice IP packet including a SIP signal for controlling a call (session) and a voice signal transmitted through the session.
This IP conversion device 4 is a device installed in a subscriber's house or in a telecommunications carrier building, and is a device for terminating an optical cable from a carrier network and converting it into a metal interface with a telephone. Telephone terminals (either the calling terminal 8 or the called terminal 9 may be accommodated).
Further, the IP conversion device 4 receives an instruction for incoming control from the accommodated subscriber server 1 and executes call connection to the accommodated destination terminal 9.

  The subscriber server 1 is in a call state that is a use state of each destination terminal 9 accommodated in the subordinate server (“in use” in which call connection is performed, as described in a balloon in FIG. 1, or “ “Unused”). Then, when the subscriber server 1 receives a call request signal from each destination terminal 9 accommodated in the subordinate via the IP conversion device 4, the subscriber server 1 obtains the destination of the call request signal and transfers it to the destination. . Similarly, the subscriber server 1 transfers a call request signal to each destination terminal 9 accommodated under the subscriber server 1 to each destination terminal 9 via the IP conversion device 4.

  In FIG. 1, three called terminals 9 (9a, 9b, 9c) accommodated in one subscriber server 1 constitute a representative line for a representative service with one representative number as an incoming call number. . Therefore, when the calling terminal 8 dials the representative number, an unused called terminal 9 among the three called terminals 9 is selected by the subscriber server 1, and only the unused called terminal 9 is called.

The AS (Application Server) 2 is a server for providing advanced services (such as representative handling services) provided by the IP network.
When providing the representative service, the AS 2 receives a connection candidate number search request corresponding to the incoming number (representative number) of the representative service from the subscriber server 1. The AS 2 obtains a list of connection candidate numbers of the called terminal 9 accommodated by the subscriber server 1 that has transmitted the search request among the connection candidate numbers corresponding to the representative lines constituting the representative number specified in the search request. And it returns to the subscriber server 1 as a candidate number list.
As a result, the subscriber server 1 refers to the used / unused usage state for each connection candidate number managed by itself from the candidate number list, selects an unused incoming number, and selects the selected called terminal 9. Incoming call control can be executed.

  The AS 2 is a case independent of the subscriber server 1, and additional installation or rebooting to the subscriber server 1 is performed in a form in which one AS 2 responds to service requests from a plurality of subscriber servers 1. By minimizing the maintenance process, new service provision functions can be introduced flexibly and services can be provided promptly.

FIG. 2 is a block diagram showing details of each of the subscriber server 1 and the AS 2 in the devices constituting the IP telephone network of FIG.
The subscriber server 1 includes a number service correspondence table 11, a service connection destination table 12, a service determination unit 13, a line selection unit 14, and an incoming call control unit 15.
The AS 2 includes a candidate number management table 21, a representative service management table 22, and a number response unit 23.

The number service correspondence table 11 shown in Table 1 shows the contract status (with a contract, or for each additional service (representative handling service, answering machine service, meter examination service, etc.) for each incoming number. Remember no contract.
For example, the incoming number “# 100” is contracted for a representative service, and the incoming number “# 200” is contracted for a representative service and an answering service.
When the service determination unit 13 receives a call request signal for each destination terminal 9 accommodated under the subscriber server 1, the service determination unit 13 applies to the call receiving number based on the call receiving number specified by the call request signal. Identify the phone service you want.

In the service connection destination table 12 shown in Table 2, for each service name of each additional service, the address of the AS 2 that is the service connection destination is associated with the communication contents (transmission parameters and reception parameters) to the connection destination. Remember.
For example, the connection destination of the representative handling service is “first AS”, the transmission parameter to the “first AS” is the incoming number (same as the representative number), and the reception parameter from the “first AS” is the representative It is a list of connection candidate numbers belonging to a number.
When the telephone service applied to the incoming call number specified with reference to the number service correspondence table 11 in Table 1 includes “representative service”, the service determination unit 13 determines the AS2 (first AS) number. By transmitting the transmission parameter described above to the response unit 23 and receiving the reception parameter as a response thereto, one receiving terminal 9 that is an incoming call target is selected from the plurality of receiving terminals 9.

  The candidate number management table 21 shown in Table 3 stores one or more connection candidate numbers constituting the representative list in association with each identifier of the representative list.

The representative service management table 22 shown in Table 4 has the “representative list” column in common with the candidate number management table 21 shown in Table 3. The representative service management table 22 manages a representative number of a representative handling service, a representative list corresponding to the representative number, and a use condition indicating a condition for using the representative list.
Table 4 shows an example of changing the representative list used for each current day of the week as an example of usage conditions.
For example, the connection candidate numbers corresponding to the representative number # 100 are “# 101, # 102, # 103” associated with the representative list “L100-1” on weekdays (Monday to Friday) (candidates) By referring to the number management table 21, connection candidate numbers can be specified from the representative list).
On the other hand, the connection candidate numbers corresponding to the same representative number # 100 are “# 103” associated with the representative list “L100-2” on Saturday.
Further, even with connection candidate numbers corresponding to the same representative number # 100, since there is no representative list associated with Sunday, no connection candidate number exists and guidance for non-business hours flows on that Sunday.

  Upon receiving the representative number “# 100” from the subscriber server 1 as a search request, the number response unit 23 obtains the corresponding representative list “L100-1” in the representative service management table 22 from the received representative number “# 100”. The candidate number list composed of the three connection candidate numbers (# 101, # 102, # 103) associated with the representative list “L100-1” in the candidate number management table 21 is obtained from the subscriber server 1. It responds to the line selector 14.

The line selection unit 14 selects, from the candidate number list received from the number response unit 23, the highest priority number (for example, # 101 having the smallest telephone number) as the incoming call number, and the incoming call control unit 15 is notified.
Here, when the line server 14 stores the current usage state of each destination terminal 9 accommodated in the subscriber server 1 by the subscriber server 1 to which the line selector 14 belongs, The current usage state of each destination terminal 9 may be read from the storage means, and the telephone number whose current usage state is “in use” in the received candidate number list may be excluded from the incoming call control in advance.

The incoming call control unit 15 requests the IP conversion apparatus 4 to perform incoming call control to the destination terminal 9 to which the incoming call number is assigned based on the notified incoming call number. Based on the request, the IP conversion device 4 performs incoming control for the incoming terminal 9 to be accommodated.
Here, when the incoming call number is in use (during a call), the incoming call control unit 15 replies to the line selection unit 14 and the candidate number that has not yet been subjected to incoming call control to the line selection unit 14. A new telephone number may be notified.

  FIG. 3 is a flowchart showing call connection processing executed by the IP telephone network according to the first embodiment.

In S <b> 11, the calling terminal 8 transmits INVITE including the representative number dialed by the caller (“# 100” in Table 3) to the relay server 3.
In S12, the relay server 3 transmits the received INVITE to the subscriber server 1a. The subscriber server 1a is the subscriber server 1 that accommodates the called terminal 9 corresponding to the representative number of INVITE.

In S21, the subscriber server 1 activates a representative handling service for the representative number of the received INVITE. Specifically, the service determination unit 13 searches the number service correspondence table 11 using the received INVITE representative number as the incoming number of the search key (“# 100” in Table 1), and displays the “representative handling service” of the corresponding record. When the "" column is "○ Contracted", the representative handling service for that incoming number is activated.
In S22, the service determination unit 13 transmits INVITE including the representative number to the number response unit 23 of the AS2. Here, the service determination unit 13 acquires the address of the transmission destination AS 2 from “service connection destination” in the service connection destination table 12.

  In S <b> 23, the number response unit 23 obtains a connection candidate number, which is a constituent element of the representative list “L100-1” corresponding to the representative number specified by INVITE from S <b> 22 in the representative service management table 22, from the candidate number management table 21. The result is extracted, and the result is acquired as a candidate number list (“# 101, # 102, # 103” in Table 3).

In S24, the number response unit 23 returns INVITE including the candidate number list acquired in S23 to the line selection unit 14 of the subscriber server 1.
In S25, the line selection unit 14 selects, from the received candidate number list, a connection candidate number whose current use state is “unused” and which has the highest priority as an incoming line (Table 3). “# 101”). Then, the line selection unit 14 notifies the incoming call control unit 15 of an incoming call control instruction specifying the incoming line.

In S <b> 31, the incoming call control unit 15 transmits INVITE (incoming line instruction) including the notified telephone number of the incoming line to the IP conversion device 4.
In S32, the IP conversion device 4 confirms that the telephone number specified by the received incoming line instruction is that of the receiving terminal 9 to be accommodated, and that the receiving terminal 9 is unused.
In S33, the IP conversion device 4 notifies the subscriber server 1a of a calling signal including information on the incoming call number confirmed in S32.
In S <b> 34, the subscriber server 1 a transfers the notified call signal to the relay server 3.
In S <b> 35, the relay server 3 transfers the notified call signal to the calling terminal 8.
In S36, the IP conversion device 4 continues to notify the ringing tone to the called terminal 9 of the incoming call number confirmed in S32. Then, when a receiver is picked up from the callee of the called terminal 9, the call connection processing between the calling terminal 8 and the called terminal 9 is completed, and a mutual call becomes possible.

  FIG. 4 is a block diagram showing an IP telephone network different from FIG. Basically, it is the same as the IP telephone network of FIG. 1 (first embodiment). However, in FIG. 4, the call connection route from the calling terminal 8 to the called terminal 9d passes through two subscriber servers 1 (1a, 1b) that accommodate the called terminal 9, but in FIG. Is different in that there is only one subscriber server that accommodates the destination terminal 9. The subscriber server 1z is a server that does not accommodate the called terminal 9.

  The subscriber server 1a accommodates the called terminals 9a and 9b, but at the time of FIG. 4, the two called terminals 9 are both in use by other call connections. Therefore, the subscriber server 1a cannot search for the called terminal 9 to which the received call connection request is allocated from the called terminal 9 that accommodates itself. Therefore, the subscriber server 1a notifies the AS2 that the other subscriber server 1b can be assigned a call connection request, and forwards the call connection request to the subscriber server 1b. To do.

  When the subscriber server 1b searches for the called terminal 9d to which the transferred call connection request is assigned from the called terminal 9d that accommodates it, the subscriber server 1b performs incoming call control on the called terminal 9d, thereby making the calling terminal 8 and the called terminal 9d. A call connection can be established.

  FIG. 5 is a flowchart showing call connection processing executed by the IP telephone network of FIG. This flowchart is a modification of part of the call connection process of FIG. Therefore, the same processes as those in FIG. 3 are assigned the same reference numerals, and the following description will be made by paying attention to the differences between the flowcharts.

  The candidate number management table 21 shown in Table 5 is an example of data referred to by the AS 2 in the IP telephone network of FIG. The difference from the candidate number management table 21 in Table 3 is that the connection candidate number includes not only the telephone number (# 101, # 102, # 103) of the called terminal 9 but also the temporary representative number (# 200). Is a point. Note that the temporary representative number handled by the subscriber server 1b is a number associated with one or more connection candidate numbers in the representative handling service, similarly to the representative number handled by the subscriber server 1a.

S11 to S22 are the same process contents as the processes indicated by the same reference numerals in FIG.
S23a is a process that replaces S23. In addition to the telephone number of the called terminal 9 acquired in S23 of FIG. 3, S23a is a process of acquiring a candidate number list including a temporary representative number corresponding to the representative number of S22. is there.
S24a is a process that replaces S24, and a process of transmitting a candidate number list including the temporary representative number of S23a instead of the candidate number list of S23.
In S25, since all the telephone numbers of the called terminals 9 included in the candidate number list received in S24a are in use, the temporary representative numbers included in the candidate number list are transferred to the INVITE in S11 and S12 in S29. First.

  FIG. 6 is a flowchart showing the continuation of the process of FIG.

In S41, the subscriber server 1a notifies INVITE including the temporary representative number determined in S29 to the subscriber server 1b that accommodates the temporary representative number.
The processing of S42 to S45 is the same as the processing of S22 to S25, but the following is the difference.
The subject of operation is replaced from the subscriber server 1a to the subscriber server 1b.
-The representative number to be searched is replaced with a temporary representative number.
Each process of S31 to S36 executed after S45 has the same processing contents as the processes indicated by the same reference numerals in FIG.

  The first embodiment (call connection processing that relays a single subscriber server 1 and call connection processing that relays a plurality of subscriber servers 1) has been described above with reference to FIGS.

FIG. 7 is a configuration diagram showing device configurations of the subscriber server 1 and the AS 2 in the second embodiment. The outline of the IP telephone network system in the second embodiment is the same as that in FIG. The differences between FIG. 7 and FIG. 2 are as follows.
The device including the line selection unit 14 is changed from the subscriber server 1 to the AS 2.
The candidate number management table 21 is changed to the candidate number management table 21b. The difference between the two tables is whether or not the current usage state for each destination terminal 9 is stored (described in Table 6 below).
A new contractor management table 24 is provided on the AS 2 side. The contractor management table 24 is referred to in the process for obtaining the temporary representative number from the representative number.

Table 6 shows the candidate number management table 21b. The difference from the candidate number management table 21 in Table 3 is that a “number state” column is added. “Number state” is a column indicating whether or not the destination terminal 9 of the corresponding connection candidate number is in use (during a call). The “number state” is a dynamic parameter (varies with the passage of time) that the AS 2 keeps acquiring and updating the latest information by monitoring the destination terminal 9.
Thereby, the line selection unit 14 of the AS 2 can select the incoming call number whose use state is “unused” from the connection candidate numbers in the candidate number list with reference to the use state of the candidate number management table 21b. .

  Table 7 shows the contractor management table 24. In the contractor management table 24, one or more representative lists used by the contractor are associated with each contractor ID.

FIG. 8 is a flowchart of call connection processing corresponding to the modification of FIG. Basically, it is the same as the flowchart of FIG. 3 with the following differences.
The processing of the line selection unit 14 for selecting an incoming line from the candidate number list (S25 in FIG. 3) is performed on the AS2 side (S25b in FIG. 8).
Instead of responding to the candidate number list (S24 in FIG. 3) as a response to the inquiry with the representative number in S22, the result selected as the incoming number is returned (S24b in FIG. 8).

Note that the message when the incoming number is notified in S24b is a communication message when the representative number as a search key is received in S22 and the incoming number is returned in S24b. One of the above may be adopted.
(Method 1) AS2 receives the SIP MESSAGE request including the representative number in S22, and transmits a “200 OK” response including the incoming number in S24b.
(Method 2) The AS 2 receives the SIP INVITE including the representative number in S22, and transmits a response signal (SIP INVITE) including the incoming number in S24b.
(Method 3) The AS 2 receives the SIP INVITE including the representative number in S22, and transmits a redirection response signal (state number 30X) in S24b.
If the contents of the number state managed in the candidate number management table 21b are old and the subscriber server 1 detects that the incoming number received in S24b is “in use”, the incoming number received in S24b May call AS2 again with another incoming number.

  FIG. 9 is a flowchart showing call connection processing executed by the IP telephone network (configuration in which the device including the line selection unit 14 is AS2) of FIG. 7 in the second embodiment. This flowchart shows the first half of the call connection process instead of the flowchart of FIG. 5, and the latter half of the call connection process is the same as the flowchart of FIG. Hereinafter, the description will be made focusing on the difference between FIG. 9 and FIG.

  The processing in S23, S24b, and S25b in FIG. 9 replaces the processing in S23a, S24a, and S25 in FIG. The processing of S23, S24b, and S25b in FIG. 9 is as described in the processing of the same reference numerals in FIG.

The processing of S26 to S28 is replaced with the processing of S29 of FIG.
In S26, the line selection unit 14 extracts one empty child number and notifies the subscriber server of the AS2, and when the subscriber server performs the incoming call processing on the child number (by timing or the like), The AS2 is notified of “busy” indicating that effect.
After S25b, it is determined whether or not AS2 is “busy”, and if it is “busy”, the process of S24b and S26 can be omitted by executing S27 immediately.
In S27, when “busy” is received, the line selection unit 14 refers to the contractor management table 24, identifies a contractor corresponding to a predetermined representative list that is “busy”, and the same contract. One or more other representative lists corresponding to the person are obtained.
Then, the line selection unit 14 selects a representative list (can be called) that includes one or more “unused” connection candidate numbers that belong to the representative list from one or more acquired other representative lists. Select a representative list). Then, the line selection unit 14 acquires a temporary representative number corresponding to the callable representative list.
The process of acquiring the temporary representative number from the representative list is a process of obtaining the corresponding “representative number” column using the “representative list” column of the representative service management table 22 as a search key.
In S28, the line selection unit 14 returns the INVITE signal in which the acquired temporary representative number is set from the AS 2 to the subscriber server 1a.
As a result, the temporary representative number received by the subscriber server 1a in S28 is guaranteed in S27 that there is one or more vacant (unused) connection candidate numbers belonging to the temporary representative number. An incoming call to the incoming terminal 9 that can receive the incoming call can be realized.

The present embodiment described above relates to a method for realizing the representative handling service realized by the circuit-switched telephone network on the IP network. By configuring the device in charge of the representative handling service as an AS 2 different from the subscriber server 1, a server / client configuration in which a plurality of subscriber servers 1 (clients) share one AS 2 (server) is established. It is possible to smoothly introduce the representative handling service while using the subscriber server 1.
Furthermore, by registering in the contractor management table 24 so that the same contractor uses a plurality of subscriber servers 1 (representative list that the subscriber server 1 is in charge of), a plurality of subscriber servers 1 can be registered. It is possible to realize a representative handling service that straddles. Therefore, since it is not necessary to make the child line that constitutes the representative the same server accommodation, it is possible to improve the facility efficiency for the operator side, and the service restrictions due to the operator convenience that the representative can only be assembled with the same server accommodation, The user does not have to accept it.

FIG. 10 is a configuration diagram showing a realization form of a representative handling service in a circuit-switched telephone network as a comparative example. Compared with FIG. 1, the following points are different.
An IC (Intra-zone Center) 73 in FIG. 10 is a device as a prefectural relay station corresponding to the relay server 3 in FIG.
In FIG. 10, there is no AS2 in charge of the representative handling service of FIG. The representative handling service in FIG. 10 is executed independently of other GCs 71 by a group unit center (GC) 71 as a group station corresponding to the subscriber server 1.

For this reason, in FIG. 10, since all the GCs 71 that accommodate the destination terminals 9 need to have the function of the representative handling service, programs and data for realizing the representative handling service for the subscriber server 1 are stored. Installation work occurs. This operation causes inconvenience to the user, such as stopping the subscriber server 1 that is operating.
Further, in FIG. 10, since the function for realizing the representative service is closed to each GC 71, the selection of the free line is limited to the destination terminals 9 accommodated in the same GC 71. For this reason, the representative handling service across a plurality of GCs 71 cannot be realized.

1 Subscriber Server 2 AS (Application Server)
DESCRIPTION OF SYMBOLS 3 Relay server 4 IP conversion apparatus 8 Originating terminal 9 Terminating terminal 11 Number service correspondence table 12 Service connection destination table 13 Service determination part 14 Line selection part 15 Incoming control part 21 Candidate number management table 22 Representative service management table 23 Number response part 24 Contractor management table 71 GC
73 IC

Claims (10)

A call connection method by a call connection system for establishing a call connection between the calling terminal and the called terminal by a call connection request from the calling terminal to the called terminal,
In the call connection request from the calling terminal, a representative number is designated as a destination,
In the IP telephone network that is the path of the call connection request from the calling terminal to the called terminal, the subscriber server that relays the call connection request and the telephone number of the called terminal that is associated with the representative number are Connected to the application server that responds to the subscriber server,
The subscriber server includes a service determination unit, a line selection unit, and an incoming call control unit,
The service determination unit determines whether the telephone number specified in the received call connection request is a target of the representative service, and as a result of the determination, the service determination unit Notifying the application server of the representative number, requesting a telephone number list corresponding to the representative number,
When the line selection unit receives a candidate number list, which is a list of telephone numbers of the called terminal corresponding to a representative number, from the application server as a request result of the service determination unit, the line selection unit is not in use from the candidate number list Select the destination phone number as the incoming number,
The incoming call control unit transfers the received call connection request to the called terminal to which the incoming call number selected by the line selection unit is assigned,
The application server includes a number response unit and storage means.
The storage means of the application server stores correspondence information between the representative number and the telephone number of the called terminal,
The number response unit uses the representative number of the call connection request notified from the service determination unit as a search key, and from the correspondence information of the storage means, a list of telephone numbers of the called terminal corresponding to the representative number of the search key As a candidate number list, and responds to the subscriber server that has notified the representative number of the call connection request. The number response unit is a temporary number that is a representative number different from the representative number of the search key, in addition to the telephone number of the called terminal corresponding to the representative number of the search key, as a telephone number constituting the candidate number list. Include a representative number and then respond to the subscriber server,
The line selection unit, when all the telephone numbers of the called terminals constituting the candidate number list are in use, a call connection request having a temporary representative number constituting the candidate number list as a new representative number, The call connection method according to claim 1, wherein the call is transferred to another subscriber server that handles the temporary representative number. A call connection method by a call connection system for establishing a call connection between the calling terminal and the called terminal by a call connection request from the calling terminal to the called terminal,
In the call connection request from the calling terminal, a representative number is designated as a destination,
In the IP telephone network that is the path of the call connection request from the calling terminal to the called terminal, the subscriber server that relays the call connection request and the telephone number of the called terminal that is associated with the representative number are Connected to the application server that responds to the subscriber server,
The subscriber server has a service determination unit and an incoming call control unit,
The service determination unit determines whether the telephone number specified in the received call connection request is a target of the representative service, and as a result of the determination, the service determination unit Notifying the application server of the representative number, requesting a telephone number list corresponding to the representative number,
The incoming call control unit forwards the received call connection request to the called terminal to which the incoming call number received as a response to the service determination unit is assigned,
The application server includes a number response unit, a line selection unit, and a storage unit,
The storage means of the application server stores correspondence information between the representative number, the telephone number of the called terminal, and the usage status of the telephone number of the called terminal,
The number response unit uses the representative number of the call connection request notified from the service determination unit as a search key, and from the correspondence information of the storage means, a list of telephone numbers of the called terminal corresponding to the representative number of the search key As the candidate number list,
The line selection unit refers to the use state stored in the storage unit from the candidate number list acquired by the number response unit, and the telephone number of the destination terminal included in the candidate number list that is not in use The call connection method is characterized by responding to the subscriber server that has notified the representative number of the call connection request. The storage means of the application server further stores a list of representative numbers used for each user,
The line selection unit, when all the telephone numbers of the called terminals constituting the candidate number list are in use, a temporary representative number that is another representative number for the same user who uses the representative number of the search key, Search from the storage means and notify the subscriber server,
The subscriber server forwards a call connection request with the notified temporary representative number as a new representative number to another subscriber server that handles the temporary representative number. Call connection method. 5. The application server further changes correspondence information between the representative number searched by the number response unit and the telephone number of the called terminal for each use time zone. The call connection method according to claim 1.   A call connection program for causing each device of the IP telephone network to execute the call connection method according to any one of claims 1 to 5. A call connection system for establishing a call connection between the calling terminal and the called terminal by a call connection request from the calling terminal to the called terminal,
In the call connection request from the calling terminal, a representative number is designated as a destination,
An IP telephone network as the call connection system serving as a path for the call connection request from the calling terminal to the called terminal includes a subscriber server that relays the call connection request and the incoming call that is associated with the representative number. Connected to an application server that responds to the subscriber server with the phone number of the terminal;
The subscriber server includes a service determination unit, a line selection unit, and an incoming call control unit,
The service determination unit determines whether the telephone number specified in the received call connection request is a target of the representative service, and as a result of the determination, the service determination unit Notifying the application server of the representative number, requesting a telephone number list corresponding to the representative number,
When the line selection unit receives a candidate number list, which is a list of telephone numbers of the called terminal corresponding to a representative number, from the application server as a request result of the service determination unit, the line selection unit is not in use from the candidate number list Select the destination phone number as the incoming number,
The incoming call control unit transfers the received call connection request to the called terminal to which the incoming call number selected by the line selection unit is assigned,
The application server includes a number response unit and storage means.
The storage means of the application server stores correspondence information between the representative number and the telephone number of the called terminal,
The number response unit uses the representative number of the call connection request notified from the service determination unit as a search key, and from the correspondence information of the storage means, a list of telephone numbers of the called terminal corresponding to the representative number of the search key As a candidate number list, and responds to the subscriber server that has notified the representative number of the call connection request. The number response unit is a temporary number that is a representative number different from the representative number of the search key, in addition to the telephone number of the called terminal corresponding to the representative number of the search key, as a telephone number constituting the candidate number list. Include a representative number and then respond to the subscriber server,
The line selection unit, when all the telephone numbers of the called terminals constituting the candidate number list are in use, a call connection request having a temporary representative number constituting the candidate number list as a new representative number, 8. The call connection system according to claim 7, wherein the call connection system transfers to another subscriber server that handles the temporary representative number. A call connection system for establishing a call connection between the calling terminal and the called terminal by a call connection request from the calling terminal to the called terminal,
In the call connection request from the calling terminal, a representative number is designated as a destination,
An IP telephone network as the call connection system serving as a path for the call connection request from the calling terminal to the called terminal includes a subscriber server that relays the call connection request and the incoming call that is associated with the representative number. Connected to an application server that responds to the subscriber server with the phone number of the terminal;
The subscriber server has a service determination unit and an incoming call control unit,
The service determination unit determines whether the telephone number specified in the received call connection request is a target of the representative service, and as a result of the determination, the service determination unit Notifying the application server of the representative number, requesting a telephone number list corresponding to the representative number,
The incoming call control unit forwards the received call connection request to the called terminal to which the incoming call number received as a response to the service determination unit is assigned,
The application server includes a number response unit, a line selection unit, and a storage unit,
The storage means of the application server stores correspondence information between the representative number, the telephone number of the called terminal, and the usage status of the telephone number of the called terminal,
The number response unit uses the representative number of the call connection request notified from the service determination unit as a search key, and from the correspondence information of the storage means, a list of telephone numbers of the called terminal corresponding to the representative number of the search key As the candidate number list,
The line selection unit refers to the use state stored in the storage unit from the candidate number list acquired by the number response unit, and the telephone number of the destination terminal included in the candidate number list that is not in use The call connection system is characterized by responding to the subscriber server that has notified the representative number of the call connection request. The storage means of the application server further stores a list of representative numbers used for each user,
The line selection unit, when all the telephone numbers of the called terminals constituting the candidate number list are in use, a temporary representative number that is another representative number for the same user who uses the representative number of the search key, Search from the storage means and notify the subscriber server,
10. The subscriber server forwards a call connection request with the notified temporary representative number as a new representative number to another subscriber server that handles the temporary representative number. Call connection system.

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