JP6185878B2 - Routing method and routing system - Google Patents

Description

  The present invention relates to a routing method and routing system for IP telephone calls in an IP (Internet Protocol) communication network.

  By using the so-called 0AB to J number system, various telephone services similar to those of the conventional public telephone network can be provided even in the IP communication network (for example, see Non-Patent Document 1). In the 0AB to J numbers, 1 to 4 digit area codes following 0 are assigned to the number sections that identify individual areas so that the first digit increases from north to south. (Refer nonpatent literature 2). In addition, one or more 1 to 4 digits of the city code following the area code is assigned to each number section. Thereby, a range (number band) of telephone numbers that can be assigned to subscribers is determined in advance for each number section.

  In this way, because of the characteristic that the area (number section) is specified by the number band, a SIP (Session Initiation Protocol) server that manages call connection control is provided for each number section, and subscribers are accommodated in units of number bands. Think of a model. FIG. 8 is a diagram illustrating a connection configuration example of the routing system of the comparative example. As shown in FIG. 8, an NGN (Next Generation Network) 1 which is a next generation IP communication network and a PSTN (Public Switched Telephone Network) 2 which is an existing public telephone network are interconnected. In addition, a traffic control system (hereinafter abbreviated as TCS (Traffic Control System)) 3 is provided that restricts outgoing calls to a specific area (instructing number band control) when congestion occurs in a specific area due to a disaster or the like. ing.

  As shown in the connection configuration example of FIG. 8, each number section (A block 10A, B block 10B) has a subscriber session control server (hereinafter referred to as SSC (hereinafter referred to as SSC)) that accommodates subscribers in number band units. Subscriber Session Control server), abbreviated as 11-13. Further, relay session control servers (hereinafter abbreviated as ISC (Intermediate Session Control Server)) 14 to 16 which are SIP servers that relay SIP signals between SSCs and between SSC and PSTN 2 are provided.

  In the example of FIG. 8, the A block 10A is provided with an SSC 11 that accommodates subscribers of number bands starting with “01-1111”. In the B block 10B, an SSC 12 that accommodates subscribers of a number band starting from “03-1111” and an SSC 13 that accommodates subscribers of a number band starting from “03-2222” are arranged. Also, the A block 10A has an ISC 14 that relays SIP signals to and from the other blocks, and the B block 10B has an ISC 15 that relays SIP signals to and from other blocks and a call between the PSTN 2 and the PSTN 2. An ISC 16 for connection is provided. Note that SIP signal routing is performed by number routing using a number band including the incoming telephone number as a key.

NTT East, “Hikari Telephone (Hikari IP Telephone)”, [online], [Search on March 28, 2014], Internet <URL: https://flets.com/hikaridenwa/> Ministry of Internal Affairs and Communications, “Telecommunications Number Designation Status”, [online], [Search March 28, 2014], Internet <URL: http://www.soumu.go.jp/main#sosiki/joho#tsusin/top /tel#number/number#shitei.html>

  Here, a problem related to the number portability service will be described. For telephone numbers that have been relocated from one SSC to another SSC in the NGN 1 by the number portability service, the identification information of the relocation destination SSC is registered in the subscriber number table of the relocation SSC. The telephone number is additionally registered in the subscriber number table. In addition, for a telephone number relocated to PSTN2 from a certain SSC in NGN1, the telephone number is deleted from the subscriber number table of the SSC before relocation, and the relocation destination group station (hereinafter referred to as GC (Group Unit Center)) The telephone number is additionally registered in the subscriber number table.

  In the data example of FIG. 8, the telephone number “02-2222-3333” accommodated in the SSC 13 is relocated to the subordinates of the SSC 12, and the telephone number “03-1111-1111” accommodated in the SSC 12 is the GC21 of the PSTN2. The case where it was moved to subordinates is shown. That is, the identification information “SSC # 2” of the transfer destination SSC of the transferred telephone number “02-2222-3333” is registered in the second row of the subscriber number table 17Y of the SSC 13, and the subscriber number table of the SSC 12 The telephone number is registered in the second row of 17X. In addition, the transferred telephone number “03-1111-1111” is deleted from the subscriber number table 17X of the SSC 12, and the telephone number is registered in the subscriber number table 23X of the GC 21.

  FIG. 9 is a diagram illustrating an example of a routing operation related to a call addressed to a telephone number transferred from one SSC subordinate to another SSC in NGN 1 by the number portability service in the comparative routing system. When a call is made from the source IP telephone terminal 31 to the telephone number “03-2222-3333”, the SSC 11 performs an INVITE signal using the telephone number (hereinafter referred to as 0AJ) as a parameter by a conventional number routing. To ISC14. Then, by the conventional number routing, a similar INVITE signal is transferred from the ISC 14 to the SSC 13 that manages the number band “03-2222” including the telephone number via the ISC 15.

  The SSC 13 refers to its own subscriber number table 17Y, so that the server routing number of the destination SSC to which the received telephone number is transferred (0AB to J numbers assigned for the number routing, hereinafter SRN (Server Routing Number)) Abbreviated). In the data example of FIG. 9, the SRN (the number is “03-1111-0000”) of the relocation destination SSC 12 is denoted as “SSC # 2”. Then, the SSC 13 returns a 301 (0AJ; SSC # 2 @ NW1) signal to the ISC 15 notifying that the telephone number has been moved under the control of the SSC 12 of its own network (@ NW1 domain). Note that @ NW1 is an example of a code added to a signal to identify the own network (the same applies to other drawings).

  The ISC 15 that has received this 301 signal transmits an INVITE (0AJ; SSC # 2 @ NW1) signal to the SSC 12 by number routing using the SRN. The SSC 12 confirms that the telephone number included in the received INVITE signal is registered in its own subscriber number table 17X, and causes the corresponding IP telephone terminal 32 to receive a call.

  FIG. 10 is a diagram illustrating an example of a routing operation related to a call addressed to a telephone number transferred from a subordinate of a certain SSC in NGN 1 to PSTN 2 by a number portability service in the routing system of the comparative example. When a call is made from the source IP telephone terminal 31 to the telephone number “03-1111-1111”, the SSC 11 performs an INVITE signal using the telephone number (hereinafter referred to as 0AJ) as a parameter by a conventional number routing. To ISC14. Then, by the conventional number routing, a similar INVITE signal is transferred from the ISC 14 via the ISC 15 to the SSC 12 managing the number band “03-1111” including the telephone number.

  Since the received telephone number is not registered in its own subscriber number table 17X, the SSC 12 sends a 301 (@ NW2) signal to the ISC 15 to notify that the telephone number has been moved to another network (@ NW2 domain). Return it. Note that @ NW2 is an example of a code attached to a signal to identify another network (the same applies to other drawings).

  The ISC 15 that has received the 301 signal transmits an INVITE signal addressed to the @ NW2 domain to the ISC 16 in order to establish a call connection to the @ NW2 domain (PSTN2). The ISC 16 converts the received INVITE signal into an IAM (0AJ) signal that is a call connection request signal of the PSTN 2 and transmits it to the gateway exchange (hereinafter abbreviated as IGS (Interconnecting Gateway Switch)) 22. The IGS 22 transfers the IAM (0AJ) signal to the GC 21 that accommodates the telephone number by conventional number routing. The GC 21 confirms that the telephone number included in the received IAM signal is registered in its own subscriber number table 23X, and causes the corresponding telephone 34 to receive a call.

  Here, as shown in FIG. 11, it is assumed that congestion has occurred in the GC 21 of the PSTN 2 in a specific area corresponding to the number band “03-1XXX” due to a disaster or the like. At this time, when receiving the congestion notification from the GC 21, the TCS 3 activates a number band restriction for restricting the transmission to the number band “03-1XXX” as a congestion countermeasure, and notifies each SSC 11-13.

  As a result, for example, when the subordinate IP telephone terminal 31 makes a call request to a telephone number included in the number band of “03-1XXX”, the SSC 11 makes all of them a target of call restriction. Accordingly, the signal indicated by the broken line in FIG. 11 is not transmitted, and even if the call is made to the telephone number “03-1111-0001” in the NGN 1 where congestion has not occurred, the call is uniformly restricted. End up. In addition, telephone numbers moved from the SSC of the number band subject to call restriction by the number portability service to another SSC or another network are also subject to call restriction.

  The present invention has been made in order to solve the above-described problems. The present invention makes it possible to limit networks to be subject to number band restrictions, and to restrict the telephone numbers to be regulated to other SSCs or other networks by a number portability service. The purpose is to exclude from the restriction of outgoing calls.

In order to achieve the above object, a first aspect of the present invention is a routing of a call control signal for setting a speech path through an IP network to an IP telephone terminal assigned 0AB to J numbers as telephone numbers. A source server which is a subscriber session control server accommodating a source IP telephone terminal, and receives a call connection request signal including a destination telephone number from the source IP telephone terminal; The address resolution apparatus in which the source server stores the telephone number of the IP telephone terminal registered as a subscriber in the IP network and the subscriber session control server of the accommodation destination in association with each other in the subscriber number routing table Transmitting the received telephone number of the destination, and the destination subscriber stored in the destination resolution device in association with the received telephone number of the destination Identifying a session control server as a destination server, returning a server routing number used for routing to the destination server to the source server, and the source server based on the server routing number, It is determined whether or not the call connection request signal is subject to the number band restriction of the own network instructed by the traffic control device, and the call connection request signal determined to be not subject to the number band restriction is transmitted to the server The step of routing to the destination server by the number routing using the routing number as a key, and the destination server that has received the call connection request signal register the destination telephone number in its subscriber number table. Ensure that is, the step of terminating the call to the IP telephone terminal of the destination to which it houses, the destination If the decision device does not store the received telephone number of the called party in the subscriber number routing table, it notifies the originating server that the received telephone number of the called party has been moved to another network. The notification server, and the call origination server determines whether the call connection request signal is subject to number band restriction of the other network instructed by the traffic control device. is not
The call connection request signal determined to be routed to a connection gateway that interconnects with the other network, and the connection gateway transmits a call connection request signal in a predetermined format including the destination telephone number to the other network. And the destination server of the other network that has received the call connection request signal in the predetermined format confirms that the destination telephone number is registered in its subscriber number table, And a step of receiving a call at a destination telephone terminal to be accommodated .

In this way, when the regulated telephone number is moved to another subscriber session control server or another network by the number portability service, it can be excluded from the subject of outgoing call regulation. Further, for a telephone number relocated from the IP network to another network by the number portability service, a communication path can be set through the connection gateway.

  A second aspect of the present invention is a call control signal routing method for setting a communication path through an IP network for IP telephone terminals assigned 0AB to J numbers as telephone numbers. A source server that is a subscriber session control server that accommodates an IP telephone terminal receives a call connection request signal including a destination telephone number from the IP telephone terminal of the source; and In the destination resolution device that stores the telephone number of the IP telephone terminal registered as a subscriber in the IP network and the subscriber session control server of the accommodation destination in association with each other in the subscriber number routing table, the received destination Transmitting the telephone number; and if the destination resolution device stores the received telephone number of the destination in the subscriber number routing table, the destination Informing the call origin server that the telephone number is accommodated in the local network, and the call origin server instructing the call connection request signal by the traffic control device based on the destination telephone number. The call routing request signal that is determined to be subject to the number band restriction of the received network is determined not to be subject to the number band restriction, and the number routing using the destination telephone number as a key. Routing to a destination server which is a subscriber session control server that stores a subscriber number in a number band including the destination telephone number, and the destination server that has received the call connection request signal If the destination telephone number is registered in the subscriber number table, the incoming IP telephone terminal receives the call, and the destination telephone number is stored in its own subscriber number table. Returning the call connection request signal to the source server of the call connection request signal when the server routing number of the transfer destination server of the number is registered. It was.

  By doing so, the conventional number routing can be applied as it is to the routing of the call control signal when the destination telephone number is accommodated in the own network, so that it can be easily applied to an operating system.

  According to a third aspect of the present invention, in the routing method, when the destination resolution device does not store the received destination telephone number in the subscriber number routing table, the received destination telephone A step of notifying the source server that the number has been moved to another network, and the source server is subject to the number band restriction of the other network instructed by the traffic control device for the call connection request signal. The call connection request signal determined not to be subject to the number band restriction is routed to a connection gateway that interconnects with the other network, and the connection gateway is connected to the other network. Transmitting a call connection request signal of a predetermined format including the telephone number of the destination to the destination server of the other network that has received the call connection request signal of the predetermined format Make sure that the telephone number of the destination subscriber number table has been registered, and shall include the step of terminating the call to the called telephone terminal to which it accommodates.

  In this way, for a telephone number relocated from the IP network to another network by the number portability service, a speech path can be set via the connection gateway.

  According to a fourth aspect of the present invention, in the routing method, when the call source server determines that the call connection request signal is subject to the number band restriction, the call connection request signal is restricted. It was supposed to be.

  In this way, it is possible to perform transmission restriction by individually specifying networks that are subject to number band restriction.

A fifth aspect of the present invention provides a subscriber session control server and a relay session control server for setting a communication path through an IP network for IP telephone terminals assigned 0AB to J numbers as telephone numbers. A call control signal routing system comprising two levels, wherein a telephone number of the IP telephone terminal registered as a subscriber in the IP network is associated with a subscriber session control server of the accommodation destination in association with the telephone number. A source server, which is a subscriber session control server that includes a destination resolution device that stores in a table and accommodates a source IP telephone terminal, sends a call connection request signal including a destination telephone number to the source IP telephone Receiving from the terminal, and transmitting the received destination telephone number to the destination resolving apparatus, and the destination resolving apparatus responds to the received destination telephone number. The subscriber session control server of the accommodation destination stored as a destination is specified as a destination server, and a server routing number used for routing to the destination server is returned to the source server, and the source server Is determined based on the server routing number whether the call connection request signal is subject to the number band restriction of the own network instructed by the traffic control device, and is not subject to the number band restriction. The determined call connection request signal is routed to the destination server by number routing using the server routing number as a key, and the destination server receiving the call connection request signal is stored in its subscriber number table. Make sure that the telephone number of the destination is registered, to the incoming call to the IP telephone terminal of the destination, the destination settlement instrumentation If the received destination telephone number is not stored in the subscriber number routing table, the destination server is notified that the received destination telephone number has been moved to another network. The call origination server determines whether the call connection request signal is subject to the number band restriction of the other network indicated by the traffic control device, and determines that it is not subject to the number band restriction. The call connection request signal is routed to a connection gateway that interconnects with the other network, and the connection gateway transmits a call connection request signal in a predetermined format including the destination telephone number to the other network. The destination server of the other network that has received the call connection request signal in the predetermined format confirms that the destination telephone number is registered in its subscriber number table and accommodates it.
It is assumed that a call is received at the destination telephone terminal .

In this way, when the regulated telephone number is moved to another subscriber session control server or another network by the number portability service, it can be excluded from the subject of outgoing call regulation. Further, for a telephone number relocated from the IP network to another network by the number portability service, a communication path can be set through the connection gateway.

Further, the sixth aspect of the present invention provides a subscriber session control server and a relay session control server for setting a speech path through an IP network between IP telephone terminals assigned 0AB to J numbers as telephone numbers. A call control signal routing system comprising a hierarchy, wherein a telephone number of the IP telephone terminal registered as a subscriber in the IP network and a subscriber session control server of the accommodation destination are associated with each other and a subscriber number routing table The source server, which is a subscriber session control server that accommodates a source IP telephone terminal, stores a call connection request signal including a destination telephone number, in the source IP telephone terminal And the received destination telephone number is transmitted to the destination resolution device, and the destination resolution device adds the received destination telephone number to the destination resolution device. If it is stored in the party number routing table, it notifies the call origin server that the destination telephone number is accommodated in its own network, and the call origin server sends the call destination telephone number to the destination telephone number. The call connection request signal is determined not to be subject to the number band restriction by determining whether the call connection request signal is subject to the number band restriction of the own network instructed by the traffic control device. Is routed to a destination server which is a subscriber session control server that stores a subscriber number in a number band including the destination telephone number by a number routing using the destination telephone number as a key, and the call connection The destination server that has received the request signal, if the destination telephone number is registered in its subscriber number table, makes a call to the destination IP telephone terminal accommodated by itself. If the server routing number of the transfer destination server of the destination telephone number is registered in its own subscriber number table, the call connection indicating that the call connection request signal should be routed to the transfer destination server The request signal is sent back to the server.

  By doing so, the conventional number routing can be applied as it is to the routing of the call control signal when the destination telephone number is accommodated in the own network, so that it can be easily applied to an operating system.

  According to a seventh aspect of the present invention, in the routing system, if the destination resolution device does not store the received destination telephone number in the subscriber number routing table, the received destination telephone The origin server is notified that the number has been moved to another network, and the origin server is subject to the number band regulation of the other network instructed by the traffic control device. The call connection request signal determined not to be subject to the number band regulation is routed to a connection gateway that interconnects with the other network, and the connection gateway is routed to the other network. The destination server of the other network that has transmitted the call connection request signal in a predetermined format including the telephone number of the destination and received the call connection request signal in the predetermined format has its subscriber number table Telephone number of the destination is confirmed that it is registered, and the one which incoming calls to the called telephone terminal itself housed.

  In this way, for a telephone number relocated from the IP network to another network by the number portability service, a speech path can be set via the connection gateway.

  According to an eighth aspect of the present invention, in the routing system, when the call origination server determines that the call connection request signal is subject to the number band restriction, the call origination signal is restricted. It was supposed to be.

  In this way, it is possible to perform transmission restriction by individually specifying networks that are subject to number band restriction.

  According to the present invention, it is possible to limit the networks to be subject to number band regulation, and when a regulated telephone number is relocated to another subscriber session control server or another network by a number portability service, it is transmitted. It can be excluded from regulation.

It is a figure which shows the connection structural example of the routing system which concerns on embodiment. It is a figure which shows the example of the routing operation | movement of 1st embodiment which concerns on the call destined for the subscriber number moved to other SSC in NGN by the number portability service. It is a figure which shows the example of the number zone control operation | movement of 1st embodiment which concerns on the call destined for the subscriber number moved from NGN to PSTN by the number portability service. It is a figure which shows the example of the routing operation | movement of 2nd embodiment which concerns on the call destined for the subscriber number moved to other SSC in NGN by the number portability service. It is a figure which shows the example of the routing operation | movement of 2nd embodiment which concerns on the call destined for the subscriber number moved from NGN to PSTN by the number portability service. It is a figure which shows the example of the routing operation | movement regarding the call addressed to the subscriber number moved to the subordinate of other SSC in NGN by the number portability service when a failure occurs in the destination resolution device. It is a figure which shows the example of the routing operation | movement which concerns on the call addressed to the subscriber number moved from NGN to PSTN by the number portability service when a failure occurs in the destination resolution apparatus. It is a figure which shows the connection structural example of the routing system of a comparative example. It is a figure which shows the example of the routing operation | movement regarding the call destined for the subscriber number moved to the subordinate of other SSC in NGN by the number portability service in the routing system of a comparative example. It is a figure which shows the example of the routing operation | movement which concerns on the call addressed to the subscriber number which moved from NGN to PSTN by the number portability service in the routing system of a comparative example. It is a figure which shows the example of the number zone control operation | movement in the routing system of a comparative example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings as appropriate.

  FIG. 1 is a diagram illustrating a connection configuration example of a routing system according to an embodiment. The routing system shown in FIG. 1 is configured by interconnecting an NGN (Next Generation Network) 1 which is a next generation network and a PSTN (Public Switched Telephone Network) 2 which is an existing public telephone network. IP telephone terminals 31 to 33 are assigned so-called 0AB to J numbers, and NGN 1 is divided into a plurality of blocks each having a number area. Each block is provided with an ISC that relays call control signals between the SSC that accommodates subscribers in the number area and other number areas and the other network (PSTN2).

  In the example of FIG. 1, the S block 11 that accommodates the subscriber number of the number band “01-1111” and the ISC 14 are arranged in the A block 10A corresponding to the number band “01-XXXX”. The B block 10B corresponding to the number band “03-XXXX” includes an SSC 12 that accommodates a subscriber number of the number band “03-1111”, an SSC 13 that accommodates a subscriber number of the number band “03-2222”, An ISC 15 and an ISC 16 for PSTN connection are provided.

  Further, the NGN 1 is provided with a destination resolution device 4, and further, a TCS (Traffic Control System) 3 is provided as a restriction instruction device for monitoring traffic of the entire network and instructing call restriction.

  The destination resolution device 4 has a subscriber number routing table 41 for storing which SSC is accommodated by the telephone number of each subscriber accommodated in the NGN 1. The data example of the subscriber number routing table 41 shown in FIG. 1 is that the subscriber number “01-1111-0001” is accommodated in the SSC 11 and the subscriber number “03-1111-0001” is accommodated in the SSC 12. Is shown. “SSC # 1” to “SSC # 3” represent SRNs used for routing to the respective SSCs. For example, the value of “SSC # 1” is “01-1111-0000”, and the value of “SSC # 2” is “03-1111-0000”.

  When congestion occurs in a network in a specific area, the TCS 3 instructs the SSCs 11 to 13 to perform network-specific number band regulation that regulates transmission to a number band in the area for each network. FIG. 1 exemplifies a case where transmission to the PSTN2 (@ NW2 domain) number band “03-1XXX” is restricted.

  In addition, in the data example of the subscriber number tables 17X, 17Y, and 23X shown in FIG. 1, the telephone number “02-2222-3333” accommodated in the SSC 13 has been transferred to the SSC 12 and accommodated in the SSC 12. The case where the telephone number “03-1111-1111” is moved under the control of the GC 21 of the PSTN 2 is shown.

  FIG. 2 is a diagram showing an example of the routing operation of the first embodiment relating to a call addressed to a subscriber number whose accommodation destination has been changed under control of one SSC in NGN 1 by another number portability service. Here, it is assumed that the network-specific number band restriction “03-1XXX @ NW2” for the @ NW2 domain, that is, PSTN2, is instructed to each SSC 11-13 from TCS3.

  When a call is made from the source IP telephone terminal 31 to the subscriber number “03-2222-3333”, the SSC 11 sends a destination resolution request signal (see FIG. 5) with the subscriber number (hereinafter referred to as 0AJ) as a parameter. 2, LIR (0AJ) is transmitted to the destination resolution device 4 as an example. The destination resolution device 4 refers to its own subscriber number routing table 41 and recognizes that the SRN of the SSC 12 accommodating the received subscriber number is “SSC # 2”. Then, a destination resolution response signal (noted as LIA (0AJ; SSC # 2 @ NW1) as an example in FIG. 2) for notifying the SRN of the SSC 12 in which the subscriber number is accommodated is returned to the SSC 11.

  Therefore, the SSC 11 confirms that the SSC 12 as the connection destination is not subject to the network-specific number band restriction specified by the TCS 3, and uses the subscriber number and the SRN as parameters by the number routing using the SRN. An INVITE (0AJ; SSC # 2 @ NW1) signal is transmitted to the ISC 14. Then, a similar INVITE signal is transferred from the ISC 14 to the SSC 12 managing the number band via the ISC 15 by the number routing using the SRN. The SSC 12 confirms that the subscriber number included in the received INVITE signal is registered in its own subscriber number table 17X, and causes the corresponding IP telephone terminal 32 to receive a call. Even if the number band “03-2222” of the SSC 13 is subject to number band regulation, the same operation is performed, and even if the SSC before relocation is subject to number band regulation, It can be excluded from regulation.

  The operation in the case of outgoing call to the subscriber number “03-1111-0001” accommodated in the SSC 12 is the same, and the subscriber number accommodated in the NGN 1 is subject to the regulation of the number band of other networks. The call connection is made normally. As described above, according to the present embodiment, even if the telephone number is included in the regulated number band, it is moved to a subordinate of another SSC from the regulated SSC when it is accommodated in a non-regulated network. If it is, it can be excluded from the restriction of outgoing calls.

  FIG. 3 is a diagram illustrating an example of the number band restriction operation according to the first embodiment relating to a call addressed to a subscriber number whose accommodation destination is changed from NGN1 to PSTN2 by the number portability service. Here, it is assumed that the network-specific number band restriction “03-1XXX @ NW2” for the @ NW2 domain, that is, PSTN2, is instructed to each SSC 11-13 from TCS3.

  When the caller IP phone terminal 31 makes a call to the subscriber number “03-1111-1111”, the SSC 11 sends a destination resolution request signal (see FIG. 5) with the subscriber number (hereinafter referred to as 0AJ) as a parameter. 3, LIR (0AJ) is transmitted to the destination resolution device 4 as an example. Since the received subscriber number is deleted from its own subscriber number routing table 41 by the number portability service, the destination resolution device 4 sends a destination resolution response signal notifying that the subscriber number has been moved to another network. (In FIG. 3, LIA (0AJ @ NW2) as an example) is returned to the SSC 11.

  At this time, since the network-specific number band restriction “03-1XXX @ NW2” for the @ NW2 domain is instructed, the SSC 11 restricts the transmission of the call addressed to the subscriber number. As a result, the signal indicated by the dashed arrow in FIG. 3 is not transmitted. Thus, according to this embodiment, the telephone number moved to another network can be included in the number band restriction target.

  FIG. 4 is a diagram showing an example of the routing operation of the second embodiment relating to a call addressed to a subscriber number whose accommodation destination has been changed under control of one SSC in NGN 1 by another number portability service through the number portability service. In the routing operation of the second embodiment, the destination resolution device 4 determines whether or not the subscriber number is accommodated in its own network instead of responding to the SSC SRN that accommodates the destination subscriber number. To respond.

  When a call is made from the originating IP telephone terminal 31 to the subscriber number “03-2222-3333”, the SSC 11 sends a destination resolution request signal (hereinafter referred to as “0AJ”) as a parameter. In FIG. 4, LIR (0AJ) is transmitted to the destination resolution device 4 as an example. Here, the destination resolution device 4 refers to its own subscriber number routing table 41 to identify the SSC that accommodates the subscriber number, but the subscriber number is simply accommodated in its own network. Is returned to the SSC 11 as a destination solution response signal (indicated as LIA (0AJ) as an example in FIG. 4).

  Therefore, the SSC 11 transmits an INVITE (0AJ) signal having the subscriber number as a parameter to the ISC 14 by the conventional number routing. Then, by a conventional number routing, a similar INVITE signal is transferred from the ISC 14 to the SSC 13 managing the number band via the ISC 15.

  Here, the SSC 13 recognizes that the SRN to which the received subscriber number is relocated is “SSC # 2” by referring to its own subscriber number table 17Y, and the subscriber number is the other of its own network. A 301 (0AJ; SSC # 2 @ NW1) signal notifying that it has been moved under the control of the SSC is returned to the ISC 15. Receiving this signal, the ISC 15 transmits an INVITE (0AJ; SSC # 2 @ NW1) signal to the SSC 12 by number routing using the SRN. The SSC 12 confirms that the subscriber number included in the received INVITE signal is registered in its own subscriber number table 17X, and causes the corresponding IP telephone terminal 32 to receive a call. As described above, according to the present embodiment, the conventional number routing can be applied as it is to the routing of the call control signal (see the comparative example of FIG. 9), so that it can be easily applied to an operating system.

  FIG. 5 is a diagram illustrating an example of the routing operation of the second embodiment relating to a call addressed to a subscriber number whose accommodation destination is changed from NGN1 to PSTN2 by the number portability service.

  When a call is made from the caller IP telephone terminal 31 to the subscriber number “03-1111-1111”, the SSC 11 sends a destination resolution request signal (hereinafter referred to as “0AJ”) as a parameter. In FIG. 5, LIR (0AJ) is transmitted to the destination resolution device 4 as an example. Since the received subscriber number has been deleted from its own subscriber number routing table 41 by the number portability service, the destination resolution device 4 sends a destination resolution response signal notifying that the subscriber number has been moved to another network. (In FIG. 5, LIA (0AJ @ NW2) as an example) is returned to the SSC 11.

  Therefore, the SSC 11 transmits an INVITE (0AJ @ NW2) signal addressed to the @ NW2 domain to the ISC 14, and a similar INVITE signal is transferred from the ISC 14 to the ISC 16 via the ISC 15 by routing to the @ NW2 domain. The ISC 16 converts the received INVITE signal into an IAM (0AJ) signal that is a call connection request signal of the PSTN 2 and transmits it to the IGS 22. The IGS 22 transfers the IAM (0AJ) signal to the GC 21 containing the subscriber number by conventional number routing, and the GC 21 registers the subscriber number included in the received IAM signal in its own subscriber number table 23X. After confirming that the call has been made, the corresponding telephone 34 is made to receive a call. As described above, according to this embodiment, since the call control signal is not routed to the SSC before relocation (see the comparative example in FIG. 10) for the telephone number relocated to another network, the SSC before relocation is a number. Even if it is subject to band regulation, a call path can be set via a connection gateway.

  Next, an operation when a failure occurs in the destination resolution device will be described. FIG. 6 shows a routing operation related to a call addressed to a subscriber number whose accommodation destination is changed from one SSC in NGN 1 to another SSC by the number portability service when a failure occurs in the destination resolution device 4. It is a figure which shows an example.

  When a call is made from the source IP telephone terminal 31 to the subscriber number “03-2222-3333”, the SSC 11 sends a destination resolution request signal (see FIG. 5) with the subscriber number (hereinafter referred to as 0AJ) as a parameter. 6, LIR (0AJ) is sent to the destination resolution device 4 as an example. Here, it is assumed that the destination solution response signal (see FIG. 2) that should be responded does not return to the SSC 11 because some failure has occurred in the destination solution device 4.

  At this time, if the destination resolution response signal does not return from the destination resolution device 4 within a predetermined time, the SSC 11 transmits an INVITE signal using the subscriber number as a parameter to the ISC 14 by conventional number routing. Then, by a conventional number routing, a similar INVITE signal is transferred from the ISC 14 to the SSC 13 managing the number band via the ISC 15.

  Here, the SSC 13 recognizes that the SRN to which the received subscriber number is relocated is “SSC # 2” by referring to its own subscriber number table 17Y, and the subscriber number is the other of its own network. A 301 (0AJ; SSC # 2 @ NW1) signal is sent to the ISC 15 to notify that it has been moved under the control of the SSC. Receiving this signal, the ISC 15 transmits an INVITE (0AJ; SSC # 2 @ NW1) signal to the SSC 12 by number routing using the SRN. The SSC 12 confirms that the subscriber number included in the received INVITE signal is registered in its own subscriber number table 17X, and causes the corresponding IP telephone terminal 32 to receive a call.

  FIG. 7 is a diagram illustrating an example of a routing operation related to a call addressed to a subscriber number whose accommodation destination is changed from NGN1 to PSTN2 by the number portability service when a failure occurs in the destination resolution device.

  When the caller IP phone terminal 31 makes a call to the subscriber number “03-1111-1111”, the SSC 11 sends a destination resolution request signal (see FIG. 5) with the subscriber number (hereinafter referred to as 0AJ) as a parameter. 7, LIR (0AJ) is transmitted to the destination resolution device 4 as an example. Here, since some failure has occurred in the destination resolution device 4, it is assumed that the destination resolution response signal (see FIG. 5) that should be responded does not return to the SSC 11.

  At this time, if the destination resolution response signal does not return from the destination resolution device 4 within a predetermined time, the SSC 11 transmits an INVITE signal using the subscriber number as a parameter to the ISC 14 by conventional number routing. Then, by the conventional number routing, a similar INVITE signal is transferred from the ISC 14 via the ISC 15 to the SSC 12 that manages the number band.

  Here, since the received subscriber number is deleted from its own subscriber number table 17X by the number portability service, the SSC 12 notifies that the subscriber number has been relocated to another network 301 (@ NW2) Send the signal to the ISC 15. The ISC 15 that has received this signal transmits an INVITE signal addressed to the @ NW2 domain to the ISC 16 in order to establish a call connection to the @ NW2 domain. The ISC 16 converts the received INVITE signal into an IAM (0AJ) signal that is a call connection request signal of the PSTN 2 and transmits it to the IGS 22. The IGS 22 transfers the IAM (0AJ) signal to the GC 21 containing the subscriber number by conventional number routing, and the GC 21 registers the subscriber number included in the received IAM signal in its own subscriber number table 23X. After confirming that the call has been made, the corresponding telephone 34 is made to receive a call.

  Thus, according to the present embodiment, even in a situation where a response is not returned due to a failure or the like of the destination resolution device, the conventional number routing using the telephone number as a key may be applied. Abnormal processing can be implemented with almost the same logic.

  As described above, according to the present embodiment, when congestion occurs in a specific area, it is possible to instruct number band regulation by limiting the network to be regulated, and the telephone number to be regulated. Can be excluded from the restriction of outgoing calls if it is moved to another subscriber session control server or another network by the number portability service.

  Although the description of the embodiment for carrying out the present invention has been described above, the embodiment of the present invention is not limited to this, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. Yes.

1 NGN (IP network)
2 PSTN (other networks)
3 TCS (Traffic Control Device)
4 Destination resolution device 11, 12, 13 Subscriber session control server (SSC, source server, destination server)
14, 15, 16 Relay session control server (ISC)
17X, 17Y, 23X Subscriber number table 21 Group station (GC, destination server)
22 Kanmon Exchange (IGS)
31, 32, 33 IP telephone terminal 34 Telephone (telephone terminal)
41 Subscriber number routing table

Claims (8)

A call control signal routing method for setting a communication path via an IP network for an IP telephone terminal assigned 0AB to J numbers as telephone numbers,
A source server, which is a subscriber session control server that accommodates a source IP telephone terminal, receives a call connection request signal including a destination telephone number from the source IP telephone terminal;
A destination resolution apparatus in which the source server stores a telephone number of the IP telephone terminal registered as a subscriber in the IP network in association with a subscriber session control server of the accommodation destination in a subscriber number routing table. Sending the received destination telephone number;
Server routing used by the destination resolution device to identify the destination subscriber session control server stored in association with the received telephone number of the destination as a destination server and to use for routing to the destination server Returning a number to the originating server;
Based on the server routing number, the call origination server determines whether the call connection request signal is subject to the number band restriction of its own network instructed by the traffic control device. Routing the call connection request signal determined not to be a target to the destination server by number routing using the server routing number as a key;
The destination server that has received the call connection request signal confirms that the destination telephone number is registered in its subscriber number table, and calls the destination IP telephone terminal accommodated by itself. A step of making an incoming call ,
If the destination resolution device does not store the received destination telephone number in the subscriber number routing table, it indicates that the received destination telephone number has been moved to another network. Notifying the server;
The call origination server determines whether the call connection request signal is subject to number band restriction of the other network indicated by the traffic control device, and determines that the call connection request signal is not subject to number band restriction. Routing the call connection request signal to a connection gateway for interconnection with the other network, and the connection gateway transmitting a call connection request signal in a predetermined format including the destination telephone number to the other network; ,
The destination server of the other network that has received the call connection request signal in the predetermined format has its subscriber number
A routing method comprising: confirming that the destination telephone number is registered in the number table and causing the destination telephone terminal accommodated therein to receive the call . A call control signal routing method for setting a communication path via an IP network for an IP telephone terminal assigned 0AB to J numbers as telephone numbers,
A source server, which is a subscriber session control server that accommodates a source IP telephone terminal, receives a call connection request signal including a destination telephone number from the source IP telephone terminal;
A destination resolution apparatus in which the source server stores a telephone number of the IP telephone terminal registered as a subscriber in the IP network in association with a subscriber session control server of the accommodation destination in a subscriber number routing table. Sending the received destination telephone number;
When the destination resolution device stores the received destination telephone number in the subscriber number routing table, the source server indicates that the destination telephone number is accommodated in its own network. The step of notifying
The call origination server determines whether the call connection request signal is subject to the number band restriction of its own network instructed by the traffic control device based on the telephone number of the destination. Subscriber session control for storing the call connection request signal determined not to be regulated by a number routing using the destination telephone number as a key, and storing a subscriber number of a number band including the destination telephone number Routing to a destination server that is a server;
If the destination server that has received the call connection request signal has the destination telephone number registered in its subscriber number table, the destination server receives the call and receives the call If the server routing number of the transfer destination server of the destination telephone number is registered in the caller number table, the call connection request signal source that the call connection request signal should be routed to the transfer destination server Routing back to the server. In routing method according to 請 Motomeko 2,
If the destination resolution device does not store the received destination telephone number in the subscriber number routing table, it indicates that the received destination telephone number has been moved to another network. Notifying the server;
The call origination server determines whether the call connection request signal is subject to number band restriction of the other network indicated by the traffic control device, and determines that the call connection request signal is not subject to number band restriction. Routing the call connection request signal to a connection gateway for interconnection with the other network, and the connection gateway transmitting a call connection request signal in a predetermined format including the destination telephone number to the other network; ,
The destination server of the other network that has received the call connection request signal in the predetermined format confirms that the destination telephone number is registered in its subscriber number table, and receives the destination Routing a call to a telephone terminal. In the routing method as described in any one of Claims 1 thru | or 3,
The origin server is
A routing method characterized in that, when it is determined that the call connection request signal is subject to the number band restriction, transmission by the call connection request signal is restricted. A call control signal consisting of two levels of a subscriber session control server and a relay session control server for setting a communication path via an IP network for an IP telephone terminal assigned with 0AB to J numbers as telephone numbers. A routing system,
A destination resolving device for storing a telephone number of the IP telephone terminal registered as a subscriber in the IP network and a subscriber session control server of the accommodation destination in association with each other in a subscriber number routing table;
The source server which is the subscriber session control server that accommodates the source IP telephone terminal receives the call connection request signal including the destination telephone number from the source IP telephone terminal, and the destination resolution device Send the received destination phone number to
The destination resolving device is a server for identifying the accommodating subscriber session control server stored in association with the received destination telephone number as a destination server and using it for routing to the destination server. Return the routing number to the originating server,
Based on the server routing number, the call origin server determines whether the call connection request signal is subject to number band restriction of its own network instructed by a traffic control device. Routing the call connection request signal determined not to be a target to the destination server by number routing using the server routing number as a key;
The destination server that has received the call connection request signal confirms that the destination telephone number is registered in its subscriber number table, and causes the destination IP telephone terminal to receive a call. ,
If the destination resolution device does not store the received destination telephone number in the subscriber number routing table, the destination resolution device indicates that the received destination telephone number has been relocated to another network. Notify the server,
The source server determines whether the call connection request signal is subject to number band restriction of the other network instructed by the traffic control device, and determines that it is not subject to the number band restriction. Routing the call connection request signal to a connection gateway that interconnects with the other network, and the connection gateway transmits a call connection request signal in a predetermined format including the destination telephone number to the other network;
The destination server of the other network that has received the call connection request signal in the predetermined format confirms that the destination telephone number is registered in its subscriber number table, and receives the destination to be accommodated by itself. A routing system characterized in that a call is received at a telephone terminal . Routing of call control signal consisting of two levels of a subscriber session control server and a relay session control server for setting a communication path through an IP network between IP telephone terminals assigned 0AB to J numbers as telephone numbers A system,
A destination resolving device for storing a telephone number of the IP telephone terminal registered as a subscriber in the IP network and a subscriber session control server of the accommodation destination in association with each other in a subscriber number routing table;
The source server which is the subscriber session control server that accommodates the source IP telephone terminal receives the call connection request signal including the destination telephone number from the source IP telephone terminal, and the destination resolution device Send the received destination phone number to
When the destination resolution device stores the received destination telephone number in the subscriber number routing table, the destination server indicates that the destination telephone number is accommodated in its own network. Notify
The call origination server determines whether the call connection request signal is subject to the number band restriction of its own network instructed by the traffic control device based on the destination telephone number, and the number band Subscriber session control for storing the call connection request signal determined not to be regulated by a number routing using the destination telephone number as a key, and storing a subscriber number of a number band including the destination telephone number Route to the destination server,
The destination server that has received the call connection request signal, when the destination telephone number is registered in its subscriber number table, causes the destination IP telephone terminal accommodated by itself to receive the call. If the server routing number of the transfer destination server of the destination telephone number is registered in its own subscriber number table, the call connection request indicating that the call connection request signal should be routed to the transfer destination server A routing system characterized by returning a signal to a signal transmission source server. In routine system responsible according to 請 Motomeko 6,
If the destination resolution device does not store the received destination telephone number in the subscriber number routing table, the destination resolution device indicates that the received destination telephone number has been relocated to another network. Notify the server,
The source server determines whether the call connection request signal is subject to number band restriction of the other network instructed by the traffic control device, and determines that it is not subject to the number band restriction. Routing the call connection request signal to a connection gateway that interconnects with the other network, and the connection gateway transmits a call connection request signal in a predetermined format including the destination telephone number to the other network;
The destination server of the other network that has received the call connection request signal in the predetermined format confirms that the destination telephone number is registered in its subscriber number table, and receives the destination to be accommodated by itself. A routing system characterized in that a call is received by a telephone terminal. The routing system according to any one of claims 5 to 7,
The origin server is
The routing system according to claim 1, wherein when the call connection request signal is determined to be subject to the number band restriction, transmission by the call connection request signal is restricted.

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