JP4600177B2 - IP telephone exchange and connection restriction method - Google Patents

Description

  The present invention relates to an IP telephone exchange and a connection destination restriction method, and can be applied to, for example, confirming whether a server of a certain operator in a VoIP network can respond to a call to a terminal of another operator's IP network. Is.

  IP telephones have become widespread, and interconnection communication between different operators has started. There are various interconnection methods such as those based on IP and via PSTN, and it is clear that the interconnection will continue to expand as needed. On the contrary, when the interconnection becomes widespread, it is necessary to consider the case where the interconnection is not allowed, that is, the case where the connection is not allowed (connection destination regulation), etc. in the IP telephone exchange (VoIP network server).

  In general, restrictions on connection destinations in connection with carriers on the telephone network are limited to the number of companies specified on the basis of telephone numbers (the identification of companies is possible by analysis up to a specific code). I have done it. This is basically the same in the world of current IP telephones, and in the IP telephone interconnection, the connection destination is generally regulated according to a numbering plan such as 050 number.

In addition, regarding IP telephone, there is Patent Document 1 as a document relating to outgoing call restriction, but no document relating to connection destination restriction is found at present.
JP 2004-158991 A

  However, there are a plurality of forms of what is called an IP phone performed by each business operator. For example, some businesses do not have telephone numbers and provide services. Further, for example, there is a business that does not own an IP telephone exchange and provides an IP telephone service using an IP telephone exchange of another business. Therefore, as with other telephones, connection destinations cannot be restricted by simply applying a method of restricting connection destinations by specifying a business operator or the like on a telephone number basis, as with other telephones.

  Therefore, there is a need for a flexible connection destination restriction method in an IP telephone network having various connection forms, and an IP telephone exchange that executes the method.

According to a first aspect of the present invention, in an IP telephone exchange provided in an IP telephone network associated with a certain business operator, (1) for each other IP telephone network that is allowed to be interconnected , identification information of the IP telephone network A first restriction information management means for managing whether or not a telephone number is assigned to the subscriber in association with the IP address and an IP address for routing the received signaling signal to the IP telephone network; (2) When another IP telephone network that is allowed to interconnect is assigned a telephone number to the subscriber, routing according to the telephone number included in the signaling signal to the IP telephone network a second restriction information management means for storing information for obtaining the IP address of use, signaling that the received (3) Acceptable identification information of the other IP telephone network to which the destination terminal in the signal belongs, based on whether it is managed by the first restriction information managing means, the other IP telephone network to which the destination terminal belongs, is interconnected Another IP telephone network to which the destination terminal belongs by referring to the management information of the first restriction information management means at the time of permission, while determining whether or not the connection is permitted and rejecting the connection when not permitted. Determines whether or not a telephone number is allocated to the subscriber. If the telephone number is not allocated, the received signaling signal is routed to the IP address managed by the first restriction information management means. On the other hand, if a telephone number is allocated, the IP address for routing is obtained from the second restriction information management means and received. Characterized in that a regulating judging means for routing the ring signal.

The third of the present invention, other IP telephone network according to the received signaling signals, when the interconnect is not allowed, the connection destination restricting method of regulating the signaling signals received, the (1) interconnect For each other permitted IP telephone network, whether or not a telephone number is allocated to the subscriber in association with the identification information of the IP telephone network, and the received signaling signal is routed to the IP telephone network. In the case where the first restriction information management means manages the IP address to be used, and (2) when another IP telephone network that is allowed to interconnect is assigned a telephone number to the subscriber, To obtain an IP address for routing according to a telephone number included in a signaling signal to an IP telephone network The information, which second regulating information management means stores, (3) regulating the determination means, identification information of the other IP telephone network that belongs destination terminal in the received signaling signals, the first based on whether it is managed by the restriction information management unit, together with other IP telephone network to which the destination terminal belongs, to determine whether or not the interconnection is allowed, to reject connections unacceptable when, permit Referring to the management information of the first restriction information management means, it is determined whether another IP telephone network to which the destination terminal belongs has assigned a telephone number to the subscriber, and the telephone number is assigned. If not, the received signaling signal is routed to the IP address managed by the first restriction information management means, while the telephone number is assigned. Case, characterized in that the said second restriction information managing means, to route the signaling signal received to obtain an IP address for routing.

  According to the present invention, it is possible to flexibly restrict interconnection between a plurality of IP telephone networks having various connection forms.

(A) First embodiment
Hereinafter, a first embodiment of an IP telephone exchange and a connection destination regulating method according to the present invention will be described in detail with reference to the drawings.

(A-1) Configuration of First Embodiment FIG. 1 is a block diagram showing a VoIP network including an IP telephone exchange according to the first embodiment.

  In FIG. 1, a VoIP network 1 has a plurality (for example, two shown in FIG. 1) of IP telephone networks (for example, carrier networks and ISP networks) 2A and 2B operated by different IP telephone operators. Each IP telephone network 2A, 2B accommodates terminals 3A1, 3A2, 3B of subscribers (users) of the network. Most IP telephone networks are provided with an IP telephone exchange 10A that performs call connection processing, as shown in the IP telephone network 2A. Note that the IP telephone exchange 10A may or may not intervene in communication in an end-to-end call state.

  The IP telephone exchange 10A is, for example, a server having a CPU, a ROM, a RAM, a hard disk, a communication unit, and the like, and functionally includes a signal processing unit 11A, a user information management unit 12A, and a routing information management unit 13A.

  The signal processing unit 11A analyzes the received IP packet message for signaling, and a processing routine 11AA for an IP packet of a connection request (for example, an IP packet of an “INVITE” message) described later with reference to FIG. Is also included. The signal processing unit 11A determines whether it can be accepted according to the management information of the user information management unit 12A or the routing information management unit 13A when there is an incoming request from the accommodated user terminals 3A1, 3A2 to another terminal. It confirms and executes connection processing and disconnection processing.

  The user information management unit 12A manages information related to the contract subscriber of the IP telephone network 2A.

  The routing information management unit 13A manages information such as a connection destination permission / non-permission condition and a connection destination address. For example, the permitted / non-permitted condition of the connection destination, the connection destination address, etc. of the IP phone network 2A of the operator A and the IP phone networks 2B to 2D of the other operators B to D are as shown in FIG. In this case, the routing information management unit 13A has a routing permission table TBL1 as shown in FIG. 3A and a number routing table TBL2 as shown in FIG. 2 and 3 show a case where there are four IP telephone networks, unlike FIG.

  In FIG. 2, the IP telephone network 2A having the domain A assigns 050 numbers to the subscribers (terminals), and the IP telephone network 2B having the domain B is also 050 to the subscribers (terminals). A number is allocated. IP telephone networks 2C and 2D having domains C and D do not assign 050 numbers to subscribers (terminals). The business operator A has concluded an interconnection contract with the business operators B and C, and has not concluded an interconnection contract with the business operator D. The IP telephone network 2A of the business operator A and the IP telephone network 2B of the business operator B communicate with each other with a 050 number, and the IP telephone network 2A of the business operator A and the IP telephone network 2C of the business operator C with a 050 number. Since communication cannot be executed, communication is performed using a URI. Further, the incoming call request addressed to the operator D is judged as an unacceptable destination by the operator A's IP telephone exchange 10A so that the incoming call to the operator D cannot be made.

  The routing permission table TBL1 shown in FIG. 3A is for each domain name that is allowed to be connected, whether it is its own domain, an IP telephone network to which a telephone number such as 050 is assigned, or the IP telephone. A transfer destination correspondence table to the network (IP telephone exchange) is described.

  In FIG. 3A, the permissible domain “A” is its own domain and has a telephone number, and the IP address is described in the transfer destination correspondence table. Here, the own domain represents a domain in which the IP telephone exchange performs call processing. The permissible domain “B” has a telephone number instead of its own domain, and is not described at all in the transfer destination correspondence table. For such a line, a number routing table TBL2 as shown in FIG. 3B is provided, and an IP address (routing destination address) of the IP telephone network 2B related to the domain is obtained from a part of the telephone number. I am trying to do it. The permissible domain “C” is not its own domain and does not have a telephone number, and an IP address is described in the transfer destination correspondence table.

  As shown in FIG. 2, the domain D belongs to the IP telephone network 2D that does not execute the interconnection. Therefore, the routing permission table TBL1 is not provided with a row for that purpose. In other words, the absence of a row indicates that there is no interconnection.

(A-2) Operation of the First Embodiment Next, a process of specifying a routing destination when the IP telephone exchange 10A receives a call request from the terminal (3A1, 3A2) of the IP telephone network 2A is shown in FIG. This will be described with reference to the flowchart of FIG. In FIG. 4, the authentication process and the like are omitted, and are described from the viewpoint of the process of specifying the routing destination.

  When the IP telephone exchange (hereinafter referred to as its own server) 10A receives a signal (IP packet for signaling) that requires routing processing from the originating terminal (step F1), the domain name of the destination set on the signal (step F1) It is determined whether or not the host name) and the domain name (host name) of the own server are the same (step F2). For example, in the case of SIP, confirmation is performed based on the URI of the request. As described above, the confirmation of the sender (authentication process) and the like are omitted.

  In the same case, since the destination is the terminal of the accommodating user of the own server, the subscriber information of the own server is confirmed and the connection process is executed (step F3).

  On the other hand, if the destination domain name does not match the domain name of the own server, it is confirmed in the routing permission table TBL1 whether or not the destination domain is a permissible domain (step F4).

  As a result of confirming the routing permission table TBL1, if a result that the destination domain is a non-permitted domain is obtained (not described in the table TBL1), an NG response is returned to the calling terminal as a reply to the call request (step F5). .

  On the other hand, as a result of confirming the routing permission table TBL1, if the result that the destination domain is an allowable domain is obtained (described in the table TBL1), whether or not the server is accommodated is searched for in the subscriber data (step F6).

  For example, when the IP telephone exchange of the IP telephone network X operates as an IP telephone exchange of another IP telephone network Y that does not have an IP telephone exchange, the step of confirming whether or not this is the case F6. In step F2 described above, it is confirmed whether the terminal of the IP telephone network X is the destination.

  If the result of determination in step F6 is that the server is accommodated, connection processing to the destination is executed (step F7).

  On the other hand, if the server is not accommodated, it is confirmed whether the telephone number information is set in the user information on the signal (step F8). When the telephone number is set, the signal transmission destination is specified from the number routing table TBL2, and the connection process is performed (step F9). On the other hand, when the telephone number is other than the telephone number, the routing permission table TBL2 is used. The destination is specified and connection processing is executed (step F10).

(A-3) Effects of the First Embodiment According to the first embodiment, the conventional telephone is considered in the VoIP network in consideration of the connection destination restriction, which is unique to the IP telephone and does not have a telephone number. Since not only the number-based connection restriction but also the logic that combines the telephone number and the domain condition is realized, it is possible to flexibly cope with the connection / connection restriction between various IP telephone service providers.

(B) Second Embodiment Next, a second embodiment of the IP telephone exchange and the connection destination regulating method according to the present invention will be described in detail with reference to the drawings.

  The VoIP network including the IP telephone exchange of the second embodiment can also be represented by the block diagram of FIG. 1 according to the first embodiment.

  However, in the second embodiment, the processing of the IP telephone exchange (referred to as its own server) 10A when receiving a signal (IP packet for signaling) related to call processing that requires routing processing is the first Unlike the embodiment, the routing information management unit 13A of the second embodiment performs a signal permission table TBL3 as shown in FIG. 5 in addition to the routing permission table TBL1 and the number routing table TBL2 described above. It has.

  The signal permission table TBL3 shown in FIG. 5 is a signal type (message type) permission table according to SIP as an example. In the case of an “INVITE” message (the message is a request or a response), transfer to the IP telephone network related to the domains “A”, “B”, and “C” is permitted for each of the domains “A”, “B”, and “C”. Message, “SUBSCRIBE” message and “NOTIFY” message, when the destination domain is domain “A” or “C”, transfer to the IP telephone network related to that domain is permitted, and the destination domain Is in the domain “B”, forwarding to the IP telephone network related to that domain is prohibited.

  The IP telephone exchange 10A also uses the signal permission table TBL3 to permit or restrict outgoing calls.

  FIG. 6 is a processing flowchart (11AB) when the IP telephone exchange according to the second embodiment receives a signal (IP packet for signaling) related to call processing that requires routing processing, according to the first embodiment. The same and corresponding steps as those in FIG. 4 are denoted by the same reference numerals.

  As is apparent from the comparison between FIG. 6 and FIG. 4, the second embodiment is different from the first embodiment in the process of step F4.

  In the case of the second embodiment, in the process of step F4, not only the routing permission table TBL1 confirms whether the destination domain is a domain to be permitted, but also a signal (message) by referring to the signal permission table TBL3. A determination is also made as to whether or not the type is permitted to be transmitted to the IP telephone network of the domain.

  When the destination domain is not a permissible domain, and even when the destination domain is a permissible domain, the type of signal (message) is not permitted to be transmitted to the IP telephone network of that domain If the destination domain is an allowable domain and the type of signal (message) is permitted to be transmitted to the IP telephone network of the domain, the process proceeds to step F5 described above. Control goes to step F6.

  In the second embodiment, the reason for determining whether or not the type of signal (message) is permitted to be transmitted to the IP telephone network of the domain is as follows. In other words, it is intended to suppress the occurrence of a signal that becomes a problem if it is transmitted, such as when the service realized by the interconnection at the time of mutual connection between providers is different from the service realized in the local server, etc. Yes. For example, a domain A operator implements a presence service, but when the IP phone network related to domain B is only a telephone-based connection, and the presence service is not interconnected, it is related to the presence service. A signal (eg, “NOTIFY” message) is not transmitted to the IP telephone network related to domain B.

  According to the second embodiment, in addition to the conditions described in the first embodiment, in consideration of IP communication such as presence, a message condition allowing transfer is set in the IP telephone exchange (in the server). Thus, it is possible to suppress transmission of an unexpected signal to the connection destination operator without being aware of the domain on the client side.

(C) Other Embodiments In each of the above embodiments, it has been shown that whether or not to restrict outgoing calls is determined based on whether or not the domain names (whole) match, but the connection destination group (other IP phones) Other group IDs may be used as long as the ID can define a network. For example, when the domain example has a fourth level or higher, up to the third level may be used for identification.

  Further, in the description of each of the above embodiments, the outgoing call restriction method for the interconnection between IP telephone networks has been described. However, in the process of FIG. 4 or FIG. May be provided.

  Further, in each of the above-described embodiments, the one in which restriction determination is performed in the preceding network of the two IP telephone networks to be determined for interconnection is described. However, in the preceding network, the destination is determined without performing restriction determination. May be transmitted to the subsequent network, and the restriction determination may be performed in the subsequent network.

  Furthermore, the method for describing the regulation condition is not limited to the description method in the table as in each of the above embodiments, and the description format is not particularly limited as long as necessary information such as the regulation condition is satisfied. Here, by describing the table description information and operation of each of the above embodiments in a scenario equivalent (CPL equivalent), it is possible to flexibly cope with the change without changing the software of the IP telephone exchange main body.

1 is a block diagram showing a VoIP network including an IP telephone exchange according to a first embodiment. It is explanatory drawing of the permission / non-permission condition of a connection destination, a connection destination address, etc. in 1st Embodiment. It is explanatory drawing which shows the routing permission table and number routing table of 1st Embodiment. It is a flowchart which shows the process of the IP telephone exchange at the time of signal reception of 1st Embodiment. It is explanatory drawing which shows a 2nd signal permission table. It is a flowchart which shows the process of the IP telephone exchange at the time of signal reception of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... VoIP network, 2A, 2B ... IP telephone network, 10A ... IP telephone exchange, 11A ... Signal processing part, 12A ... User information management part, 13A ... Routing information management part, TBL1 ... Routing permission table, TBL2 ... Number routing table , TBL3 ... signal permission table.

Claims (3)

In an IP telephone exchange provided in an IP telephone network related to a certain operator,
For each other IP telephone network that is allowed to be interconnected, whether or not a telephone number is allocated to the subscriber in association with the identification information of the IP telephone network, and the received signaling to the IP telephone network First regulatory information management means for managing IP addresses for routing signals;
When another IP telephone network that is allowed to be interconnected assigns a telephone number to a subscriber, the IP address for routing according to the telephone number included in the signaling signal to the IP telephone network Second regulatory information management means storing information for obtaining
Based on whether the identification information of the other IP telephone network to which the destination terminal in the received signaling signal belongs is managed by the first restriction information management means, the other IP telephone network to which the destination terminal belongs Is determined to be permitted, the connection is rejected when it is not permitted, and other IPs to which the destination terminal belongs are referred to by referring to the management information of the first restriction information management means when permitted. It is determined whether or not the telephone network allocates a telephone number to the subscriber. If the telephone number is not allocated, the signaling signal received to the IP address managed by the first restriction information management means On the other hand, when the telephone number is assigned, the IP address for routing is sent from the second restriction information management means. Further comprising a regulating judging means for routing the signaling signal received to obtain IP telephone exchange, characterized in. A third restriction information managing means for managing type information of a signaling signal that allows transfer to and from another IP telephone network;
The restriction determination means includes the signal type of the received signaling signal and the third restriction even if another IP telephone network to which the destination terminal of the received signaling signal belongs is allowed to interconnect. As a result of the determination based on the management information by the information management means, when the type of the received signaling signal is not allowed to be transferred between other IP telephone networks, the connection of the received signaling signal is regulated. The IP telephone exchange according to claim 1, wherein In a connection destination restriction method for restricting a received signaling signal when another IP telephone network related to the received signaling signal is not allowed to be interconnected,
For each other IP telephone network that is allowed to be interconnected, whether or not a telephone number is allocated to the subscriber in association with the identification information of the IP telephone network, and the received signaling to the IP telephone network The first restriction information management means manages the IP address for routing the signal,
When another IP telephone network that is allowed to be interconnected assigns a telephone number to a subscriber, the IP address for routing according to the telephone number included in the signaling signal to the IP telephone network The information for obtaining the information is stored in the second regulatory information management means,
Another IP telephone to which the destination terminal belongs based on whether the identification information of the other IP telephone network to which the destination terminal belongs in the received signaling signal is managed by the first restriction information management means. The network determines whether or not the mutual connection is permitted, rejects the connection when it is not permitted, and refers to the management information of the first restriction information management means when permitted to refer to the destination terminal It is determined whether another IP telephone network to which the IP address belongs has been assigned a telephone number to the subscriber. If no telephone number has been assigned, the IP address managed by the first restriction information management means In the case where the received signaling signal is routed and the telephone number is assigned, the routing information is routed from the second restriction information management means. Destination restricting wherein the to route the signaling signals received to obtain an IP address.

Images