KR20110070401A - System for providing number portability of wire telephone using telephone number mapping - Google Patents

Abstract

PURPOSE: A number portability providing system of a wire telephone using ENUM is provided to offer a number portability service to an exchange with only a partial function. CONSTITUTION: ENUM(Telephone Number Mapping) servers(120,130) receive the number movement information request of a called subscriber. An MGCF(Media Gateway Control Function)(170) requests the number movement information of the called subscriber for a call to the ENUM server. The MGCF processes the incoming of the call with routing information within the number movement information of the called subscriber. In case the called subscriber performs number movement, an exchanger(180) routes the call to the MGCF.

Description

System for providing number portability of landline telephone using ENNM {SYSTEM FOR PROVIDING NUMBER PORTABILITY OF WIRE TELEPHONE USING TELEPHONE NUMBER MAPPING}

The present invention relates to a number portability of a landline telephone, and more particularly, to a telephone line using a telephone number mapping (ENUM), that is, a telephone using a public switched telephone network (PSTN) network, a voice over internet protocol (IMS) / IMS (IP Multimedia Subsystem) The present invention relates to a system for providing number portability of landline telephones using ENUM, which provides number portability of Internet telephony using a network, and further provides routing functions according to types of subscribers in a VoIP / IMS network.

Number portability is a technology that can be used without changing the number in use even when changing the carrier or location or service within the same carrier.

Number portability allows communication service users to freely select operators regardless of phone number, to promote competition among operators, and to minimize user inconvenience in changing phone numbers when changing carriers or residences. It was introduced.

In the PSTN network, the technology for providing number portability using the intelligent network has been developed and the number portability providing method using the ENUM server has been studied in the Internet telephone network. Rather than applying the number portability method, it is effective to introduce a method that can be provided in the Internet telephone network, but there is no applicable method so far.

In the VoIP / IMS network, there is a need for a method for selecting routing by prefix or domain in the originating network for each type of number-calling subscriber.

Therefore, the number of mobile subscribers is increasing due to the widespread use of internet phones. Considering that the number of mobile users is the number transfer from PSTN network to VoIP / IMS network, it is possible to minimize the network investment cost by applying them in common. There is a need for a number portability provisioning method.

An object of the present invention, which was devised to solve the above problems, is to provide a system for providing number portability of a landline telephone using ENUM that can provide ENUM based number portability to a PSTN network.

Preferably, the present invention can provide a number portability using ENUM by providing only a part of functions to the exchange constituting the PSTN network, it is possible to reduce the cost required to build a large number portability database (NPDB) of the PSTN and the development of the intelligent network interface.

Another object according to an embodiment of the present invention, wired using ENUM that can select and route the routing method by the prefix and the routing method by the domain method according to the capability of the control device of the VoIP / IMS in the VoIP / IMS network The present invention provides a number portability providing system for telephones.

In order to achieve the above object, a system for providing number portability of a landline telephone according to an aspect of the present invention includes an ENUM server for receiving a number porting information request of a called party and inquiring and providing number porting information of the called party; Interworking with the EUNM server, when a call is received, the ENUM server requests and receives the called party's number porting information for the call, and receives the call using routing information included in the received subscriber's number porting information. A media gateway control server (MGCF) for terminating the incoming subscriber; And when the call is attempted by the calling party, it is possible to determine whether the called party's number is transferred to the attempted call, and if the called party is ported, the switch may route the call to the media gateway control server.

Preferably, the media gateway control server interoperates with the ENUM server to query the ENUM server for the number transfer of the called party, and receives a result from the ENUM server; A number porting message constructing unit for constructing the session control message when the called party is ported through the result received from the ENUM server; A session control unit for requesting a number porting query of the called subscriber to the ENUM interworking unit when the call is received from the exchange and controlling the number porting message constructing unit to construct the session control message; And a routing processor for routing the session control message to a corresponding route.

Preferably, the switch is a number port call processing unit for determining whether the number of the incoming subscriber; And a call routing unit for routing the call to the media gateway control server when the called party number is ported by the number porting call processor.

Preferably, the ENUM server includes a number port data unit for storing routing information of the number port subscriber; A master NPDB interworking unit for receiving number porting data in association with a master NPDB for storing number porting information between providers and storing the number porting data in the number porting data unit; A data management unit for retrieving number porting information for the number porting information request of the called party from the number porting data unit and constructing a result message; And a control device interworking unit configured to receive the request for number porting information of the called party and provide it to the data management unit, and to provide the result message configured by the data manager to the device that requested the number porting information of the called party. .

Preferably, the exchange routes the call attempted by the calling party to a preset called exchange, and when the called subscriber receives a call release message including a cause of call release due to number porting, the called party transfers the number. You can judge that.

According to another aspect of the present invention, there is provided a system for providing number portability of a landline telephone, comprising: an ENUM server for receiving a number porting information request of a called party and inquiring and providing number porting information of the called party; Interworking with the EUNM server, when a call is received, the ENUM server requests and receives the subscriber's number porting information for the call, and when the called subscriber is a number ported subscriber, it is included in the number porting information of the called party. A media gateway control server (MGCF) for processing the call to the called party by using routing information; And a switch that transmits the attempted call to the media gateway control server when the call is attempted by the calling party.

Preferably, the ENUM server may provide number porting information including a routing number (RN) and a Session Initiation Protocol (SIP) -Uniform Resource Identifier (URI).

Furthermore, when a call is attempted by a first calling party, the first called subscriber's number porting information about the attempted call is received and received by the ENUM server, and when the first called subscriber is a subscriber ported, the call is the first caller. 1 may further include a session control server configured to configure a session control message by using the number transfer information of the first called subscriber so that the called party can be called and route the session control message to a corresponding route.

Preferably, the session control server can configure the session control message by selecting any one of the routing number (RN) and the SIP-URI, may be a soft switch or IMS-based Call Session Call Function (CSCF) have.

Preferably, the media gateway control server can process the call to the called party by using the routing number (RN).

Preferably, the session control server is interlocked with the ENUM server ENUM interworking processing unit for querying the ENUM server whether the number of the first incoming subscriber or not, and receives the result from the ENUM server; A number porting message constructing unit for constructing the session control message when the first called party is ported through the result received from the ENUM server; A session control unit for requesting a number porting query of the first called party to the ENUM interworking unit when the call is attempted by the first calling party and controlling the number porting message constructing unit to construct the session control message; And a routing processor for routing the session control message to a corresponding route.

According to the present invention, it is possible to reduce the cost of building a system because the number portability service can be provided by providing only a part of functions at the exchange without the construction of a large NPDB of the PSTN and the development of the intelligent network interface in the telephone network that is being developed as an internet phone. It has an effect.

In addition, in the VoIP / IMS network, the routing method by prefix and the domain routing method in the existing PSTN are mixed, and the routing method can be selected and processed according to the capability of the VoIP / IMS controller. have.

Other objects and features of the present invention in addition to the above objects will be apparent from the description of the embodiments with reference to the accompanying drawings.

In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

Hereinafter, a number portability providing system of a landline telephone using ENUM according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8.

Telephone Number Mapping (ENUM) is a protocol that converts E.164 phone numbers into Uniform Resource Identifiers (URIs), an Internet address system, that is, a Domain Name System (DNS) scheme that is widely applied to existing Internet Protocol (IP) networks. A mechanism that allows mapping of an E.164 number to a URI, such as an IP address or email address, of a resource associated with that number. In terms of services, the ENUM service provides an E.164 phone number, which is an ideal concept that enables access to all services by freely providing the URIs of the various services associated with this number in the ENUM server through a single identification number. Through the phone or IP network to access a variety of communication services such as telephone, fax, e-mail and the Internet homepage.

The present invention provides the number portability in the PSTN network by using the ENUM as described above, including the routing number (RN: Routing Number) and SIP-URI in the number portability information provided by the ENUM server configured in the VoIP / IMS network Session Control Server For example, a soft switch or a call session call function (CSCF) selects one of a routing method using a routing number and a routing method using a SIP-URI to provide a routing function.

1 illustrates a number portability providing system of a landline telephone using ENUM according to an embodiment of the present invention.

Referring to FIG. 1, the number portability providing system of a wireline telephone includes a master NPDB 110, an ENUM server 120, 130, a session control server 140, 150, an interconnection server 160, a media gateway control server (MGCF). ) 170 and exchanger 180.

In FIG. 1, it is assumed that a first VoIP network and a PSTN / mobile communication network are the same first provider network, and the second VoIP network is a second provider network different from the first VoIP network.

The master NPDB 110 is the highest number portability database that manages number portability information between providers. When the number portable subscriber occurs, the master NPDB 110 provides new routing information to ENUM servers 120 and 130 for routing to a new destination.

For example, when the master NPDB 110 requests the number porting data of the subscriber from the second ENUM server 130 to the master NPDB 110 from the ENUM server of the operator's network, the master NPDB 110 indicates that the subscriber is a subscriber. ENUM server of the operator's network before number porting Here, the number number data of the subscriber is requested and received by the first ENUM server 120 and stored therein, and the number porting data provided from the first ENUM server 120 is stored. Provided to the server 130 and stored in the second ENUM server 130, and if the number porting is activated, the master NPDB 110 provides the information about this to the first EUM server to store the number porting information of the number porting subscriber The number porting information of the number porting subscriber may be stored in the ENUM servers 120 and 130 before and after the number porting.

The ENUM server 120, 130 is used for number porting from a control device that provides a telephone call connection function, such as a session control server 140, 150, a media gateway control function (MGCF) 170, or an interconnection server 160. It receives the information request and searches the corresponding number, that is, the number subscriber's number porting information in the number porting database managed internally, and provides the number porting information to the requesting device.

Of course, the number porting information between the operators is obtained from the master NPDB (110), the number porting information inside the provider updates the number porting information by the service provider internal procedures without interworking with the master NPDB (110).

In the present invention, the ENUM server 120, 130 manages the number of mobile subscriber information for all carrier VoIP and PSTN network, the number of mobile phone number, subscriber's new routing number (RN) and subscriber in the IMS network In case of subscriber, it manages including SIP-URI.

2 is a diagram illustrating an embodiment of an ENUM server for providing number portability according to the present invention. As illustrated, the ENUM servers 120 and 130 may include a master NPDB linking unit 210 and a data management unit ( 220, the number porting data unit 230 and the control device interlocking unit 240.

The master NPDB interworking unit 210 receives the number porting data in association with the master NPDB 110 that stores the number porting information between operators, and stores the number porting data in the number porting data unit 230 to manage them.

The number porting data unit 230 stores routing information of the number porting subscriber.

Here, the routing information may be stored in the form of a routing number (RN) and / or SIP-URI in the form of a telephone number. The routing number has a prefix structure in the form of a telephone number for an incoming call to a mobile provider network. When the moved network is a network capable of domain routing such as an IMS network, the SIP-URI may be managed and provided to the session control server when a number porting information is requested from the session control server.

For example, as shown in FIG. 5, when the number porting information for the subscriber is requested by the DNS query message 510 from the session control server or the MGCF, the ENUM server 120 or 130 sends a response message 520 thereto. It provides the number porting information of the subscriber including both the SIP-URI 521 and the routing number 522. Of course, since both the routing number and the SIP-URI are included in the number porting information, a routing function can be performed by selectively selecting the routing method using the routing number and the routing method using the SIP-URI according to the performance of the device.

Referring back to FIG. 2, the data management unit 220 transmits the number porting data unit to the number porting information request by the session control server 140 or 150 or the MGCF 170 received through the control unit linking unit 240. 230, a result message, that is, a response message, is configured, and the response message is provided to the requesting device through the control device interworking unit 240.

The control unit interworking unit 240 is linked with the device for controlling the session of the call, such as the session control server 140, 150 or MGCF 170 in real time to provide real-time information, which is provided by the data management unit 220 The function handles the response to the request. That is, the control device interworking unit 240 receives the number portability information request of the called subscriber from the session control server 140 or 150 or the MGCF 170 and provides it to the data management unit 220, and the data management unit 220. It provides a response message configured by the session control server (140, 150) or MGCF (170).

When the ENUM server 120, 130 receives a request for providing number porting information for the called party from the session control server 140 or 150 or the MGCF 170, the ENUM server 120 and 130 inquires the number porting data unit 230 to obtain information. If there is no called party number at the time of inquiry, it returns no information because it is not a number ported subscriber, and if there is a called party number, it is a number ported subscriber, so the routing number (RN) is encoded and returned in the return message. In this case, if there is a SIP-URI, the routing number and the SIP-URI are simultaneously encoded and transmitted in the return message.

In this case, if the SIP-URI exists, the network to which the called party number has moved is configured to enable routing by the domain when the calling network is the same as the IMS network, which is used in the existing PSTN in the Internet telephone network. Instead, it is intended to provide routing functions by domains that more closely match the routing concept of the Internet.

The session control server 140 or 150 receives a session connection or disconnection request from the terminals 141 and 142 and inquires the location of the called subscriber to establish or release a session. The session control server 140 or 150 inquires about all outgoing calls originating from the terminals 141 and 142 connected to its system and determines whether the number is transferred based on the received number porting data. If the call is directed to a number ported subscriber, the session control message is configured using the number porting information received from the ENUM servers 120 and 130, and the session control message is routed to the corresponding new route. That is, the session control server 140, 150 inquires about the outgoing call to the ENUM server 120, 130, and constructs a new routing message using "RN" or "SIP-URI" when the called subscriber is a number ported subscriber. It provides a function to process the incoming call to the number portable subscriber.

At this time, the session control server (140, 150) may be a soft switch or IMS-based Call Session Call Function (CSCF).

The MGCF 170 is a device for providing an IP capability for a telephone call in a PSTN / mobile communication network in the form of a soft switch. In the present invention, the ENUM server 120 or 130 is provided with the IP capability of the PSTN / mobile communication network. It is used to provide the interworking function with.

In the present invention, the MGCF 170 interworks with the EUNM servers 120 and 130, and when a call is received from the exchange 180, the MGCF 170 requests and receives the number transfer information of the called subscriber for the call to the ENUM server 120 and 130. The call received from the exchange 180 is received by the called party by using the routing information included in the number transfer information of the called subscriber received from the ENUM servers 120 and 130.

3 is a diagram illustrating an embodiment of a session control server and an MGCF for providing number portability according to the present invention. As shown in the drawing, the session control servers 140 and 150 and the MGCF 170 interwork with ENUM. It includes a processing unit 310, number porting message configuration unit 320, session control unit 330 and routing processing unit 340.

The functions of each configuration will be described separately for 1) Session Control Server and 2) MGCF.

1) Each configuration in the session control servers 140 and 150 will be described.

The ENUM interworking processing unit 310 is a function unit directly interworking with the ENUM servers 120 and 130 to obtain number porting information. The ENUM interworking unit 310 receives a request for securing number porting information of the session controller 330, that is, the number subscriber's number porting information. To query the number portability of the ENUM server (120, 130). The query is performed using the called party number as an ID, and the response is transmitted to the session controller 330.

The number porting message constructing unit 320 is a function unit for configuring a session control message when the called subscriber is a number porting subscriber as a result of the ENUM server 120 and 130 inquiry by the ENUM interworking unit 310. Do this.

In this case, the number porting message configuration unit 320 may configure a session control message for domain routing by the SIP-URI instead of a routing number when the SIP-URI is provided as the number porting information and the session control server has a domain routing function. have.

The session controller 330 has an interface with the ENUM interworking processor 310 to request the ENUM server 120 and 130 queries for all outgoing calls, and in the case of a number ported call, the number control message constructing unit 320 controls the number. Configure the session control message via the mobile message constructing unit 320.

The routing processor 340 performs routing processing for the number porting call, and routes the session control message to the corresponding route.

Here, when the routing processor 340 configures the session control message by using the routing number in the number porting message configuration unit 320, there may be no functional additional element that is distinguished from the general call.

2) Each configuration in the MGCF 170 will be described.

The ENUM interworking processing unit 310 is a function unit directly interworking with the ENUM servers 120 and 130 to obtain number porting information. The ENUM interworking unit 310 receives a request for securing number porting information of the session control unit 330, that is, the number subscriber's number porting information. To query the number portability of the ENUM server (120, 130). The query is performed using the called party number as an ID, and the response is transmitted to the session controller 330.

The number porting message constructing unit 320 is a function unit for configuring a session control message when the called subscriber is a number porting subscriber as a result of the ENUM server 120 and 130 inquiry by the ENUM interworking processor 310. URI may be included, but MGCF has no domain routing function. Therefore, it is preferable to construct a session control message using a routing number.

When the session controller 330 receives a call from the exchange 180, the session controller 330 requests an incoming subscriber's number porting query for receiving the call to the ENUM interworking processor 310, and if the call is a number ported call, the number porting message constructing unit 320. Control to configure the session control message through the number porting message configuration unit 320.

The routing processor 340 performs routing processing for the number porting call, and routes the session control message to the corresponding route.

The interconnection server 160 is a system used to provide protocol matching, billing, or security functions between service providers. Number transfer calls between service providers are originated / received through the interconnection server.

The switch 180 of the PSTN / mobile communication network provides outgoing / incoming call processing of a Plain Old Telephone Service (POTS) subscriber, such as session control servers 140 and 150 of a VoIP provider network. Receives the call originated by the calling party to determine whether the incoming subscriber's number port for the received call, and if the incoming subscriber ported the number to route the call to the MGCF (170). That is, when the exchange 180 detects the number porting fact about the number mobile subscriber call, the switch 180 routes the call to the MGCF 170 and the MGCF 170 receives the call from the NUMCF 170 to the newly moved network through the query of the ENUM servers 120 and 130. Should be handled to be.

Figure 4 shows an embodiment configuration for an exchange for providing number portability according to the present invention, as shown, the exchange 180 is a number port call processor 410, call routing unit 420 and call The control unit 430 is included.

The number port call processor 410 determines that the called number has been moved by receiving a call release due to number porting from the original destination exchange.

In this case, the number mobile call processor 410 routes the call sent by the calling party to a preset original destination exchange and receives a call release message including a cause of call release due to number porting from the destination exchange. It can be determined that the number has moved.

The call routing unit 420 routes the call to the MGCF 170 when it is determined by the number porting call processor 410 that the called party has ported the number.

The call controller 430 performs a call processing function of the existing exchange.

The number portability processing of the exchange is a case of applying the QoR (Query on Release) method among the number portability processing methods of the PSTN. However, in the present invention, when the call is released due to the number porting, the exchange transmits an inquiry to the number portability database (NPDB) of the PSTN. Without attempting, the call is routed to the designated route, ie MGCF 170.

Furthermore, the exchange 180 applies an All Call Query (ACQ) method, rather than a QoR method, and when the call originator attempts to make a call, the exchange 180 does not determine whether the recipient has moved the number, and then calls the call to the MGCF 170. It is possible to determine whether or not the incoming subscriber's number transfer through the query to the ENUM server (120, 130) through the MGCF (170) by automatically forwarding, the call may be processed according to the result.

That is, the exchange 180 automatically transmits the call to the preset MGCF 170 when the originating call is generated by the calling party, and transmits the number porting information of the called subscriber who receives the call from the MGCF 170 to the ENUM server 120. 130) after receiving the result and receiving the result, if the destination subscriber ported the call using the RN included in the number porting information to route the call to the subscriber, and if the recipient is not number ported MGCF (170) In the same manner as in the conventional routing method, the call is sent to the destination exchange in which the called subscriber is located by using the called number collected by the first originating exchange 180 as routing information.

The terminals are the Internet telephone terminals 141 and 142 of the VoIP network, the POTS telephone 181 and the mobile telephone terminal 182 of the PSTN / mobile communication network.

The above-described ENUM servers 120 and 130 interoperate with the session control servers 140 and 150 using the DNS (Domain Name Server) protocol, and the session control servers 140 and 150, the MGCF 170 and the interconnection server ( 160) interwork with each other using SIP.

As described above, the system for providing number portability of a wireline telephone according to the present invention provides call processing for number portability from a PSTN network to a VoIP / IMS network based on ENUM, thereby establishing a large-scale NPDB of a PSTN and developing an intelligent network interface. The required cost can be reduced, and the numbering information including the routing number and the SIP-URI is provided by the ENUM server (120, 130), so that the routing method by the prefix and the routing method by the domain according to the function in the session control server. You can also select to process.

6 is a flowchart illustrating a number mobile call processing process according to an embodiment of the present invention, which is a process of processing a number mobile call originating from the same service provider.

In this case, the terminal 1 is an originating terminal, the terminal 2 is a called terminal which has been ported a number, the session control server (outgoing) and the session control server (incoming) are the soft switch or IMS system that accepts the terminal and handles the incoming and outgoing call. Home Subscriber Server) is a system that manages subscriber profiles in IMS network. Soft-switch network does not exist as a separate device. ENUM server provides number porting information.

Referring to FIG. 6, for the call connection from the terminal 1 to the terminal 2, the terminal 1 requests a call connection (INVITE) from the session control server (sending) that receives the terminal 1 (S610).

The session control server (sent) checks the ENUM server for all outgoing calls to check whether the called party is a number ported subscriber and checks whether it is a number ported. If it is a number ported subscriber, the ENUM server for incoming connection to a new destination. A session control message is configured and received by using RN / SIP-URI, which is the number porting information provided by S 620 and S 630.

At this time, the session control server (outgoing) can route the call to the next session control server through prefix routing when the RN is received from the ENUM server inquiry result, and checks its routing capability when the SIP-URI is received together with the RN. If the domain routing is possible, the call can be received using the received SIP-URI. If not, the call can be received using the RN as before.

The session control server (outgoing call) composes a SIP message to receive a call. As in this case, the session control server (routing) configures new routing information in the SIP message through the ENUM server query result and routes it.

The session control server (incoming call) analyzes the session connection request message (INVITE) received from the session control server (outgoing call), and if the called subscriber is a number ported subscriber, searches the subscriber corresponding to the called party number using the RN parameter. Call to the terminal 2 (S640).

Here, when the session control server (incoming) is a soft switch, since the subscriber information is managed by itself, it can be received using its own subscriber management information. However, when the session control server (incoming) is IMS, the subscriber information is HSS. Since it is managed by the HSS can be retrieved by receiving the incoming subscriber search (S631).

The session control server (incoming call) is equipped with a function to recognize and process RN parameters in SIP messages.

Subsequent process steps S650 to S690 are processed in the same manner as the existing call setting process, and the description thereof will be omitted since it will be apparent to those skilled in the art.

7 is a flowchart illustrating a number mobile call processing process according to another embodiment of the present invention, which is a process of processing a number mobile call originating from and to a service provider (a first provider network and a second provider network). .

Referring to FIG. 7, in order to connect a call from a terminal 1 to a terminal 2, the terminal 1 requests a call connection (INVITE) from a session control server (sending) that accepts it (S710).

The session control server (sent) checks the ENUM server for all outgoing calls to verify that the incoming call is a number ported subscriber, and if it is a number ported subscriber, the ENUM server for incoming connection to the new destination. A session control message is configured and received using the provided RN / SIP-URI (S720, S730).

At this time, the session control server (outgoing) may route the call to the next stage session control server to the interconnection server through prefix routing when the NUM of the ENUM server inquiry result is received.

The interconnection server analyzes the SIP message for the call establishment request received from the session control server (send) and finds and sends the session control server (incoming) of the final destination network, that is, the second provider network, using the RN parameter.

The interconnect server is equipped with an ENUM server query processing function and a function to recognize and process RN parameters in SIP messages.

At this time, if the interconnection server does not include NPDI (Number Portability Dip Indicator) parameter indicating the completion of the ENUM server query in the SIP message, the interconnection server may query the ENUM server to obtain and transfer the number porting information, and then route the NPDI parameter. If it is included, the call setup has been completed by the ENUM server query, and the incoming routing can be processed by the RN. This may be an appropriate method in consideration of various network structures and providing capabilities of operators.

When the SIP-URI is received together with the RN, the session control server (incoming call) checks its own routing capability, and if the domain routing is possible, the session control server (incoming) uses the received SIP-URI. Receive.

The session control server (incoming call) analyzes the session connection request message (INVITE) received from the session control server (outgoing call), and if the called subscriber is a number ported subscriber, searches the subscriber corresponding to the called party number using the RN parameter. To the terminal 2 (S740).

Here, when the session control server (incoming) is a soft switch, since the subscriber information is managed by itself, it can be received using its own subscriber management information. However, when the session control server (incoming) is IMS, the subscriber information is HSS. Since it is managed by the HSS can be retrieved by receiving the incoming subscriber search (S731).

Subsequent process steps S750 to S790 are processed in the same manner as the existing call setup process.

8 is a flowchart illustrating a number porting call processing process according to another embodiment of the present invention, in which a subscriber who has been subscribed to a PSTN network (second provider network) moves a number to an Internet telephone network (first provider network). It is about the processing of calls that have been moved to.

Here, the exchange (send) refers to the exchange in which the terminal 2 requesting call establishment is accommodated, and the exchange (incoming) refers to the exchange housed before the terminal 1 is number-shifted.

Referring to FIG. 8, when a call originated from terminal 2 to terminal 1 is attempted and received, the exchange (routing) routes the exchange to a preset exchange (reception) for the called party number of terminal 1 (S811 and S812).

The exchange (incoming party) receives the incoming request, checks the subscriber information of the terminal 1, determines that the subscriber of the terminal 1 is a number ported subscriber, and includes a call release message (REL [number transfer]) including the cause of the call release due to the number porting. To the exchanger (send) (S813).

In response to this, the exchange (send) routes the call to the MGCF by means of a predetermined routing function since the call release cause is number portability (S814).

Since MGCF is equipped with a function to query the ENUM server for all calls received from the exchange (originating), the ENUM server inquires the number porting information for the called party, and this call setup called party number is the number ported call. The server receives notification from the server, configures a session control message using the RN included in the number porting information, and routes the call to the session control server (incoming call) through the interconnection server (S820 and S830).

In this case, the SIP-URI may be included in the number porting information according to the ENUM query. However, since MGCF does not have a domain routing function, routing is possible only by the RN.

Subsequent process steps S841 to S870 are processed in the same manner as the existing call setup process.

In FIG. 8, although a call release message indicating that the called subscriber has been ported by the QoR method has been received from the switch (origin) in FIG. 8, the call originating call is generated by the exchange in the ACQ form without being limited thereto. When the call is sent to the preset MGCF, the caller's number porting information is queried from the ENUM server in the MGCF, and when the callee is ported according to the result, the session control server is located by using the RN. If the called subscriber is not ported, the call recipient is located using the called number collected by the original originating exchange 180 as routing information in the same manner as the existing routing method in the MGCF 170. It can also be processed to be sent to the destination exchange.

As described above, the number portability provision system of a landline telephone according to the present invention provides an ENUM server connection function for providing number portability data to a soft switch controlling a gateway (AG, TG) in a PSTN, and an intelligent network base for an originating / receiving end station exchange. By implementing only the QoR switching function among the number portability methods without implementing or implementing additional functions, it is possible to reduce the cost required to implement the system. Integrate mobility.

In addition, in the VoIP / IMS network, a control device for maintaining the subscriber's domain or RN in the ENUM server according to the recipient's number porting type and configuring the outgoing VoIP / IMS network, for example, the domain according to the capability of a soft switch or CSCF. Routing or routing by RN can be selected and processed.

According to the present invention, a system for providing number portability of a landline telephone using ENUM can be modified and applied in various forms within the scope of the technical idea of the present invention and is not limited to the above embodiments. In addition, the embodiments and drawings are merely for the purpose of describing the contents of the invention in detail, not intended to limit the scope of the technical idea of the invention, the present invention described above is common knowledge in the technical field to which the present invention belongs As those skilled in the art can have various substitutions, modifications, and changes without departing from the spirit of the present invention, it is not limited to the embodiments and the accompanying drawings. And should be judged to include an equal range.

1 illustrates a number portability providing system of a landline telephone using ENUM according to an embodiment of the present invention.

2 is a diagram illustrating an embodiment of an ENUM server for providing number portability according to the present invention.

3 is a diagram illustrating an embodiment of a session control server and an MGCF for providing number portability according to the present invention.

Figure 4 shows an embodiment configuration for an exchange for providing number portability according to the present invention.

5 illustrates an example of a query and response message for an ENUM server according to the present invention.

6 is a flowchart illustrating a number mobile call processing process according to an embodiment of the present invention.

7 is a flowchart illustrating a number mobile call processing procedure according to another embodiment of the present invention.

8 is a flowchart illustrating a number mobile call processing procedure according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110: master NPDB

120: first ENUM server

130: second EUNM server

140, 150: session control server

160: interconnection server

170: Media Gateway Control Server (MGCF)

180: exchanger

Claims (12)

An ENUM server for receiving the number porting information request of the called party and inquiring and providing the number porting information of the called party; Interworking with the EUNM server, when a call is received, the ENUM server requests and receives the called party's number porting information for the call, and receives the call using routing information included in the received subscriber's number porting information. A media gateway control server (MGCF) for terminating the incoming subscriber; And When the call is attempted by the calling party, it is determined whether the called party's number is transferred to the attempted call, and when the called party is ported, the switch is configured to route the call to the media gateway control server. Number portability providing system of the landline telephone including a. The method of claim 1, The media gateway control server An ENUM interworking processing unit interworking with the ENUM server to query the ENUM server whether the incoming subscriber's number has been ported, and receiving a result from the ENUM server; A number porting message constructing unit for constructing the session control message when the called party is ported through the result received from the ENUM server; A session control unit for requesting a number porting query of the called subscriber to the ENUM interworking unit when the call is received from the exchange and controlling the number porting message constructing unit to construct the session control message; And Routing processing unit for routing the session control message to the corresponding route Number portability providing system of a landline telephone comprising a. The method of claim 1, The exchanger A number port call processor for determining whether the called party's number is moved; And A call routing unit for routing the call to the media gateway control server when the called party number is ported by the number porting call processor Number portability providing system of a landline telephone comprising a. The method of claim 1, The ENUM server A number porting data unit for storing routing information of the number porting subscriber; A master NPDB interworking unit for receiving number porting data in association with a master NPDB for storing number porting information between providers and storing the number porting data in the number porting data unit; A data management unit for retrieving number porting information for the number porting information request of the called party from the number porting data unit and constructing a result message; And A control device interlocking unit for receiving the number porting information request of the called party and providing it to the data manager, and providing the result message configured by the data manager to the device that requested the number porting information of the called party. Number portability providing system of a landline telephone comprising a. The method of claim 1, The exchanger Routing the call attempted by the calling party to a predetermined destination exchange and determining that the called party has ported when receiving a call release message including a cause of call release due to number porting from the destination exchange; Number portability provision system of landline telephone. An ENUM server for receiving the number porting information request of the called party and inquiring and providing the number porting information of the called party; Interworking with the EUNM server, when a call is received, the ENUM server requests and receives the subscriber's number porting information for the call, and when the called subscriber is a number ported subscriber, it is included in the number porting information of the called party. A media gateway control server (MGCF) for processing the call to the called party by using routing information; And Switch that sends the attempted call to the media gateway control server when the call is attempted by the calling party Number portability providing system of the landline telephone including a. The method of claim 6, The ENUM server A system for providing number portability of a landline telephone, characterized by providing number porting information including a routing number (RN) and a Session Initiation Protocol (SIP) -Uniform Resource Identifier (URI). The method of claim 7, wherein When a call is attempted by a first calling party, the first called subscriber's number porting information about the attempted call is received and received by the ENUM server, and when the first called subscriber is a number ported subscriber, the call is received by the first called party. A session control server for constructing a session control message using the number transfer information of the first called subscriber so that the subscriber can be called and then routing the session control message to a corresponding route. Number portability providing system of the landline telephone further comprising a. The method of claim 8, The session control server And selecting one of the routing number (RN) and the SIP-URI to configure the session control message. The method of claim 8, The session control server System for providing number portability of landline telephones, characterized in that the soft switch or IMS-based Call Session Call Function (CSCF). The method of claim 7, wherein The media gateway control server A system for providing number portability of a landline telephone, characterized in that the call is received by the called party using the routing number (RN). The method of claim 8, The session control server An ENUM interworking processor that interoperates with the ENUM server to query the ENUM server whether the number of the first called subscriber is ported and receives a result from the ENUM server; A number porting message constructing unit for constructing the session control message when the first called party is ported through the result received from the ENUM server; A session control unit for requesting a number porting query of the first called party to the ENUM interworking unit when the call is attempted by the first calling party and controlling the number porting message constructing unit to construct the session control message; And Routing processing unit for routing the session control message to the corresponding route Number portability providing system of a landline telephone comprising a.

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