KR20030068105A - Service method and System of Unconditional Call Forwarding Service to the SIP-based Internet phone for mobile subscriber on mobile network - Google Patents

Abstract

PURPOSE: A device for supplying an Internet call forwarding service in a mobile communication system is provided to couple with an existing MSC of a WIN(Wireless Intelligent Network), and to interwork a mobile communication network with an Internet network, thereby supplying an integrated network voice call service. CONSTITUTION: An SIP user agent(340) operates an Internet cal forwarding service call. A parlay gateway(350) transceives information between an Internet network and an existing wireless phone network with an intelligent network signaling system by interworking a call with wireless intelligent network service systems, as adjusting signals, and converts a voice signal into a voice data packet to transmit the packet, then converts the voice data packet into an analog signal to transmit the signal to a wireless switching network. An application server(360) manages and controls an Internet call forwarding service with a phone-to-PC system under an Internet environment for the call incoming from the wireless phone network.

Description

Device and method for providing Internet call forwarding service in mobile communication system {Service method and System of Unconditional Call Forwarding Service to the SIP-based Internet phone for mobile subscriber on mobile network}

The present invention is not a conventional call forwarding service that directly connects a call made to a service subscriber to another general telephone or a mobile phone in advance in a mobile communication system. The present invention relates to a processing method for providing an integrated network call service capable of making a call to an IP phone, and more specifically, in combination with an existing mobile switching center (MSC) of a wireless intelligent network environment (WIN). The present invention relates to a call processing method using a SIP protocol-based Internet telephony system that can provide an integrated network voice call service by interworking a mobile communication network and an internet network with an intelligent network service structure.

A call forwarding service method, which is a current mobile communication supplementary service that enables a subscriber to preset a phone number to be forwarded using a mobile communication terminal and to transfer a call from a caller to a desired phone number, is as follows.

1 is a block diagram of a conventional mobile communication system for call forwarding, including: a mobile station (110), a base station (BTS) base station (BTS) 120, a base station controller (BSC) ( 130), mobile switching center (MSC) (150), visitor location register (VLR) (145), home location register (HLR) (160) and wireless intelligent network environment (WIN) : Wireless Intelligent Network (165).

Call processing for the call forwarding service through the mobile communication system configured as described above,

The first mobile communication switch (MSC: 140) of the gateway function that is the first incoming call to the call from the caller 180 to the mobile terminal 110 of the subscriber is a visitor location register (VLR: 145). In accordance with the request, the visitor location register (VLR: 145) requests routing information to the home location register (HLR) 160 so that the call forwarding is performed if the called subscriber is a subscriber to the call forwarding service. The call forwarding phone number pre-specified in conjunction with the wireless intelligent network system environment (WIN: 165) to receive the routing information of the pre-set and registered call forwarding number and maintain the call at the number according to the received routing information. (190).

This existing call forwarding service allows you to connect an incoming call directly to another predefined phone or mobile phone, regardless of the state of the phone, depending on the subscriber's service settings, or when you are on a call, the phone is powered off, or you do not receive a call. In addition, it is provided in the form of a service that automatically connects to another pre-designated phone or mobile phone, and the call forwarding function is possible only to the designated CO line or mobile communication terminal.

In addition, the existing Internet telephony service is mainly based on ITU-T's H.323 protocol, and is mainly made out of PC-to-phone call-based Internet telephony service. It has a service limit such as lack of incoming call function for incoming calls directly from wired and wireless telephone network. Currently, the Internet phone service is not receiving an incoming number of the Internet phone number system, and does not have an independent called number system, and has not been established as a main communication service provider of a main telecommunication service provider.

As an alternative to the simple call forwarding service and the Internet telephony service in the existing mobile communication system, the Internet call forwarding service in the mobile communication system provided by the present invention is an integrated network service by flexibly interworking the existing wireless intelligent network and the Internet network. Should be provided. To this end, in order to provide efficient interworking of wireless intelligent network and Internet network, efficient call interworking through signal interworking structure, efficient traffic routing in voice and data networks, and flexible call processing are needed based on call translation techniques. . To this end, the system for providing the Internet call forwarding service provided by the present invention is No7. Parlay API technology (Parlay / OSA (Open Service Architecture)), which is a kind of open communication application standard (API) that can integrate signal processing function and other network area including internet, and provide new multimedia service with decentralization concept, and next-generation network We propose a system method based on SIP (Session Initiation Protocol) technology, which is a signal control and call processing protocol applied to the service layer of a VoIP network that can provide various additional services in a (NGN) network.

FIG. 2 is a block diagram showing a service control structure for a next-generation network to which the Parlay API, which is an open communication application standard (API) applied in the present invention, is integrated so that various additional services can be provided by integrating a communication network and the Internet network. Parlay Application Server (210), Service Gateway (220: Parlay / OSA Service Gateway), Wireless Intelligent Network (230: Wireless Intelligent Network), Wired Intelligent Network (250: Wired Intelligent Network) and Internet Network (240: IP Network).

The service control structure in the next-generation network configured as described above is as follows.

The PAL application server 210 provides a network and service independent environment by complying with the open API Parlay API, and is a service platform that can create and provide various intelligent additional services.

The service gateway 220 serves as a service gateway station and provides a Parlay Gateway function from a functional point of view, and provides an IP service control point (IP SCP) function and SIP / H. 323 It provides IP SSP (IP Service Switching Point) function that IP terminal can receive intelligent network service of public telephone network. The transport network interface method between the service gateway and the core network element of the wireless switching network does not bring about a change in the core network element by interfacing with the standard protocol basically provided by the core network element. As shown in FIG. 2, the MSC and the interface of the wireless intelligent network 230 are linked to CAP / No.7, which is the basic protocol of the 3G network, and Win / No.7, which is the basic protocol of the 2.5G network, when the 3G network is the 3G network. Interworking with the SSP in the wired intelligent network 250 environment is interlocked with INAP / No. 7, and interworking with the telephone service system of the Internet network 240 is interworked with the SIP protocol.

As described above, the Internet call forwarding service and system method provided by the present invention interlocks a call received by a service subscriber with an internet network without a mobile terminal regardless of a local space. As a call service in the form of an integrated network service that can transfer calls to an IP phone, it is characterized by the following purpose of the next generation network (NGN) service.

Any Time, Any Where

-Easy to use (integrated type) wired / wireless terminal (Any Device)

-Regardless of their location and type of network (Any Network)

-Service Level Agreement for Service Quality Selection and Guarantee

In the present invention, as described above, based on the SIP protocol technology emerging as the underlying protocol of the Next Generation Network (NGN), a service gateway for interworking with an existing wireless intelligent network and a type of open communication application standard (API) Internet call forwarding service application server based on Parlay API technology (Parlay / OSA (Open Service Architecture)) is implemented inside existing mobile telecommunications intelligent network system to connect directly to other predefined phones or mobile phones. It aims to provide a method to proactively and efficiently provide the requirements for the call forwarding service in the new type of integrated network that has expanded the form of the simple call forwarding service into the Internet domain.

1 is a block diagram of a mobile communication system for the current call forwarding.

2 is a block diagram illustrating a service control structure for a next-generation network to which the Parlay API, which is an open communication application standard (API), is applied.

3 is a block diagram illustrating a system for providing an Internet call forwarding service in a mobile communication system according to an exemplary embodiment of the present invention.

4 is a detailed configuration diagram of an Internet call forwarding service system in a mobile communication system according to an exemplary embodiment of the present invention.

5 is a schematic diagram of the overall mobile communication intelligent network system configuration including the Internet call incoming service system according to an embodiment of the present invention.

6 is a general call flow diagram illustrating an Internet call forwarding service.

7 is a detailed view of the overall call flow.

The present invention is not connected to the existing call forwarding service form that directly connects an incoming call to a mobile communication service subscriber, regardless of the state of the mobile phone, to another wired or wireless telephone, which is previously designated. It proposes an integrated network service that provides an Internet call forwarding service that can make a call to a softphone or an IP phone.

In the mobile communication system according to an embodiment of the present invention, the Internet network interworking call forwarding service integrates a wireless intelligent network and an internet network to provide a SIP-based internet intelligent network for providing a converged network service over the Internet and a wireless network. As a service structure, by using the Internet telephony service system based on the SIP protocol as a service interworking system and integrating it into the existing wireless intelligent network, the main mobile operator can diversify the service without incurring large network construction costs. It is a very useful invention that gives service users another opportunity.

In addition, the Internet call forwarding service apparatus in the mobile communication system according to an embodiment of the present invention is Internet call forwarding based on Parlay API technology (Parlay / OSA (Open Service Architecture)) which is a kind of open communication application standard (API) By adopting service application server and wireless intelligent network interworking and SIP-based internet call processing and signal processing, service gateway is used to simplify the network connection, enabling efficient operation of increasingly complex mobile communication network. By implementing an open service network, it is possible for a mobile carrier to simply add an application server that provides another service without the investment of a new infrastructure in providing a variety of integrated network services in addition to the rapid spread of the Internet in the future. various It allows the new service provider. Parlay API technology (Parlay / OSA (Open Service Architecture)), a type of open communications application specification (API), is a third-party, open, independent application programming interface (API) specification defined by the Parlay Group (www.parlay.org). As a communication technology that allows a party application and an application server to utilize a carrier's network resources, the system configuration is configured as an application interface between call control elements such as a service gateway or an Internet telephone terminal and an application server.

In addition, the Internet call forwarding service device in the mobile communication system according to an embodiment of the present invention has the ability to set / release the call signal path between each other, which is the transfer of the destination / caller side information, connection stop / resume, session delivery By adopting Session Initiation Protocol (SIP), which is used as a communication mechanism between call control elements including multi-party connection establishment capability, etc., it operates as a common standard protocol for communication between all network elements. This means that the service application can be introduced quickly with little effect on the existing wireless switching network. The RTP interface is used to access the media stream for voice call in the data network.

Next, a detailed description of a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals and the same constituent elements may be indicated by the same reference numerals and symbols as much as possible even though they are displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the SIP protocol, which is emerging as a base protocol of the Next Generation Network (NGN) of the present invention as described above, a function for controlling intelligent network call processing, and a Parlay API technology, which is a kind of open communication application standard (API) ( The configuration and operation of an Internet call forwarding service system having a service control structure using Parlay / OSA (Open Service Architecture) will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a system for providing an Internet call forwarding service in a mobile communication system according to a preferred embodiment of the present invention to achieve the above object, and the Internet call forwarding service system 370 proposed in the present invention. Is a SIP-based client configured as a soft phone or an IP phone, the Internet phone terminal 340, transmits and receives information to and from each other, and connects signals between the Internet network and the existing wireless telephone network, and a voice signal of the wireless network. Service gateway 350 that acts as a gateway for service based on the SIP protocol-based gateway function and the wireless intelligent network, which converts and transmits the voice data packet to the voice data packet, converts the voice data packet on the Internet into a voice analog signal, and delivers it to the wireless switching network. And calls received from wired or wireless telephone networks (S1: 300) By connecting to the Internet phone terminal 340 by a phone-to-PC (S3: 320) method in an Internet environment, not a wireless terminal (S2: 310) of a subscriber of a telephone network, an Internet call receiving service is provided. It consists of an application server 360 based on the Parlay API that handles voice calls and manages and controls the overall Internet call forwarding service.

Detailed configuration of the Internet call forwarding service system 370 is composed of a service gateway 350, an application server 360, the Internet phone terminal 340, as shown in Figure 4, the service gateway 350 In detail, the No. 7 that supports the ITU-T White Book Version by tightly coupling with the CAP / No.7 or Win / No.7 protocol scheme of the wireless intelligent network in connection with the service control unit 410. 7 stacks and No7. A signal processing unit (Signaling Gateway) 425 in charge of processing a signal method and a signal control layer;

A call processing unit (SIP Trunk Gateway) 430 which is tightly coupled with the voice system of the wireless intelligent network and is in charge of the voice transmission layer;

It is located between the wireless switching network and the Internet network with the call processing unit, and the media transmission format is located between different networks, and when the media is transmitted to another network, the SIP protocol base converts the media into a data format that matches the transmission format of the network. A packet processing unit (SIP Packet Gateway) 435 of the gateway function;

It is a server that controls the SIP network and plays a role similar to the gatekeeper of H.323, and comprehensively handles the call management request received from the user agent (UA) such as call setup, cancellation, and termination. Proxy server function and receiver that acts as a router for the application layer that forwards SIP requests / responses that store and send messages simultaneously to the registered SIP addresses of the same user. A proxy server 445 for performing a redirect server function to inform a client of a location of another server;

The SIP user terminal manages the session of the terminal in the SIP network, locates the location that matches the address and checks the location and stores the subscriber's data and services. A registration server (SIP Location / Registrar Server) 440 which performs a register server function for registering as a part of a network and updates and manages information on a current location of a user;

In the implementation of the intelligent network service, by separating the functions into a voice transport layer and a signal control (intelligence) layer, the service logic program can be added and designed to be implemented very flexibly without significantly affecting the existing network. In this paper, we propose a system method for implementing Internet intelligent network service logic that interworks with existing wireless intelligent network, and is in charge of packet-based service logic control and call processing control by interworking with service control system (SCP) of wireless intelligent network. A service control unit (IP-SCP: IP-Service Control Point) 410;

An operation management unit 415 which performs various operation management functions necessary for performing services such as various measurement and statistical processing functions, data processing functions, data backup management functions, system overload management functions, failure management functions, audit functions, and operation terminal functions. ;

A DB storage unit 405 for performing all data storage, processing, and management functions required to perform a service function;

In order to provide Internet call forwarding services for subscribers, external system interworking is required to perform various interworking and communication functions, and subscriber information such as service subscription and termination is applied to CCS 630, BS 620, SCP ( 610, the external link unit 420, etc. to be delivered to the HLR (160).

The application server 360 provides an environment independent of the network and services by complying with the open API Parlay API, and is an application service platform structure capable of creating and providing various intelligent additional services. An Internet call forwarding service application server (455) that provides a control, execution, management, and generation environment for application services;

Another Internet call forwarding supplementary service application server for providing various additional services such as voice mail verification function or text transmission service (SMS) required for performing Internet call forwarding service on a SIP-based network. Application Server) 460;

And a service interworking unit 450 for performing various interworking and communication functions with the service gateway and relaying data processing required by the Internet call forwarding service application server.

The Internet phone terminal 340 is an application function of a caller (User Agent Client) in charge of SIP-based call origination, an application of a called user (callee). Accept, redirect, or reject a call. It consists of application function (User Agent Server) of called party which is in charge of SIP-based call reception.

In order to achieve the above object, specific technical elements, configurations, interworking standards, standardized communication standards and system functions per se for a SIP-based network environment, which is a configuration item of the present invention, or a parlay-based service gateway environment, which is an open API. Detailed descriptions will be omitted, and in order to achieve the above object, the SIP protocol and Parlay API technology, which is one of the Open Communication Application Specification (API), which are emerging as the underlying protocol of this Next Generation Network (NGN), Referring to the operation of the Internet call forwarding service apparatus according to a preferred embodiment of the present invention having a service control structure applying Parlay / OSA (Open Service Architecture),

A first step of processing a service subscription request through a call center, the Internet, a mobile phone terminal device, etc. in order to receive an Internet call forwarding service in a mobile communication system;

First of all, the subscriber transfers the incoming call regardless of the state of the mobile phone to the Phone-to-PC (S3: 320) method through the Internet phone terminal 340 based on the SIP protocol on the Internet. A second step of transmitting an internet call forwarding service setting request through a mobile phone terminal device, a soft phone, or an internet phone terminal to receive an internet call forwarding service capable of making a call;

When the subscriber makes a request for setting up an Internet call forwarding service using a mobile phone terminal device on a wireless telephone network, the mobile switching center (MSC) 140 receives the subscriber's Internet call forwarding service request signal and controls the call processing. To the intelligent network service control system (Service Control Point: SCP) 610, the intelligent network service control system 610 in the home location register (HLR: Home Location Register) (160) service subscriber's mobility information parameters and additional services Storing and managing information, and delivering service setting information to the service gateway 350 to prepare mobility guarantee for Internet call roaming for the subscriber;

Similarly, when the subscriber requests an Internet call forwarding service setting request through the Internet phone terminal 340 on the Internet network, the call setup request message including the Internet call forwarding service setting information from the subscriber's Internet phone terminal 340 is recalled. The intelligent network service control system 610 received by the Internet call forwarding service application server 455 and interworking with the intelligent network service control system 610 of the wireless intelligent network through the service gateway 350. Preparing a mobility guarantee for Internet call roaming for a subscriber by allowing a home location register (HLR) to store and manage mobility information parameters and additional service information of a service subscriber;

Calls to subscribers with the Internet call forwarding service are forwarded to the Internet call path by the wireless intelligent network service system and the service gateway. This call processing is performed by the subscriber's Internet phone terminal 340 accessing the service gateway. Therefore, the session of the terminal is registered, and the terminal is notified that the session has been added to the management is being managed and the subscriber's Internet phone terminal 340 is not managed because the session is not registered. The session registration status and location information of the Internet telephony terminal 340 of the call forwarding service subscriber on the SIP network are always registered and managed by the service gateway 350. The status of the subscriber is the service control system 610 of the wireless intelligent network. A fifth step of allowing the home location register (HLR) 160 to always manage the status of service subscribers in association with the home location register (HLR);

When the Internet phone terminal 340 of the subscriber who is set up for the Internet call forwarding service is disconnected from the SIP network, the service gateway 350 causes the intelligent network service control system 610 of the wireless intelligent network to cause the home location register (HLR). A sixth step of storing a state of a service subscriber in a home location register (160) to establish a call connection to a voice mailbox service system for an incoming call;

The Internet phone terminal 340 of the subscriber in which the Internet call forwarding service is set is registered with the session on the SIP network and managed by the service gateway 350. The service gateway 350 is an intelligent network service control system of a wireless intelligent network ( A seventh process of waiting for an internet call to allow the 610 to store a state of a service subscriber in a home location register (HLR) 160 to establish a call connection to the service gateway 350 for an incoming call;

Gateway to which the first call is received for the call from the caller 180 to the mobile terminal 110 of the subscriber when the Internet phone terminal 340 of the subscriber having the Internet call forwarding service is set on the SIP network. The function mobile communication exchange (MSC) 140 requests the visitor location register (VLR) 145 to check whether the called subscriber is a subscriber having the Internet call forwarding function and, according to this request, the visitor location register (VLR). 145 receives routing information from the home location register (HLR) 160 to the service gateway 350 so that call forwarding is performed if the called subscriber is an Internet call forwarding service subscriber. Request to the system (Service Control Point: SCP) 610, the service control system (Service Control Point: SCP) 610 receives the request The subscriber who needs the call forwarding service to the signal processing unit 425 while connecting the voice transport layer path to the call processing unit 430 of the service gateway 350 for the incoming call by controlling the call exchange setting to the callway 350. Receives the information through the signal control layer passage, converts the subscriber's telephone number to the IP address where the subscriber's Internet telephone terminal session is registered, and causes the packet processing unit 435 to receive the incoming call and the subscriber's An eighth step of opening a call channel between the call processing sessions to make a voice call;

When the call is made in the above state and the call is terminated between the users and the call recovery signal is input to the mobile communication exchange (MSC) 140 of the gateway function with the incoming call, the call end state is indicated by the service control point. : SCP (610), the service control system (Service Control Point: SCP) 610 sends a recovery completion signal to disconnect the service gateway 350 and the mobile communication switch (MSC) (140) and all The call is terminated and the service gateway 350 transmits a message (AC_BYE) informing the termination of the call setup connection to the Internet phone terminal 340 according to the SIP protocol to close the call channel by closing the call. Is terminated, or the call is terminated from the Internet network to complete the call from the service gateway 350, the call is terminated by disconnection request .;

When the subscriber requests to cancel the Internet call forwarding service setting through the mobile phone terminal device on the wireless telephone network or the Internet phone terminal 340 on the Internet network, the mobile communication switch (MSC) 140 or service Through the gateway 350, the intelligent network service control system 610 interoperates with the intelligent network service control system 610 of the mobile wireless intelligent network to the home location register (HLR) 160 to provide mobility information of a service subscriber. A tenth step of preparing a general voice call service to a mobile terminal by storing and managing parameters and additional service information;

Characterized in that consists of.

FIG. 5 is a diagram schematically illustrating an overall mobile communication intelligent network system configuration including all of the above-described Internet call termination service systems according to an exemplary embodiment of the present invention.

Next, a call flow operation by an internet call forwarding service in a mobile communication system according to an exemplary embodiment of the present invention will be described in detail with reference to the flowcharts of FIGS. 6 and 7.

6 is a general call flow diagram illustrating an Internet call forwarding service in which a call is made to a subscriber to which an Internet call forwarding service is set up and a call is connected to the subscriber's Internet telephone terminal in the form of an integrated network service through interworking with a wireless intelligent network and an Internet network. It shows the configuration.

FIG. 7 shows the overall call flow of FIG. 6 in detail. In detail this,

When the call is received (S701), the visitor location register (VLR: 145) causes the visitor location register (VLR: 145) to determine whether the called party has a call forwarding function. In accordance with this request, the visitor location register (VLR: 145) provides a service from the home location register (HLR) 160 so that the incoming call is transferred to the Internet network if the called subscriber is a subscriber of the Internet call forwarding service. Receive the routing information to the gateway 350 (S702), and the MSC requests the call processing control to the intelligent network service control system (Service Control Point: SCP) 610 to establish a call to the received routing information (S702); In step S703, the intelligent network service control system 610 causes the intelligent network service switching point (SSP) 600 to control call setup (S704). The voice channel is coupled to the processing unit 430 to open and connect the voice channel (S706), and the signal channel is coupled to the signal processing unit 425 of the service gateway to open the signal channel (S705). And establishes a call line by controlling a call setup, and the intelligent network service control system 610 transfers routing information of the call forwarding service subscriber by interworking with the service control unit 410 of the service gateway and the intelligent network signal processing (SS7). (S707) The service gateway 350 calls the call received from the intelligent network service control system 610 to call the open API (Parlay API) to send a routing request for the called number to the Internet call forwarding service application server 455. (S708) The call forwarding service application server 455 translates the received subscriber's telephone number into a SIP address on the SIP network and delivers it to the service gateway. The packet processing unit 435 of the service gateway transmits a SIP protocol request message (INVITE) to the proxy server 445 to start a session according to the SIP protocol with the received SIP address of the service subscriber (S710). 445 requests the subscriber location information of the SIP address from the registration server 440 (S711), and the registration server 440 transfers the registered IP address when registering the session of the subscriber's Internet telephone terminal 340. (S712) The proxy server 445 transmits the INVITE SIP message to the received IP address (S713). If the OK response transmission state is determined from the Internet phone terminal 340, the proxy server 445 transmits an OK response message to the packet processing unit 435. Accordingly, the packet processing unit 435 transmits the ACK SIP message to the IP address of the subscriber's Internet telephone terminal 340. (S714) A SIP-based voice network is formed between the wireless network and the Internet through the service gateway, thereby making the call path The voice call is established according to the RTP protocol. (S715) When the call is terminated from the Internet phone terminal 340, the Internet phone terminal 340 transmits a BYE SIP message (S717), and the service gateway 350 and the Internet phone. The call is terminated by closing the communication channel between the terminals 340, so the service gateway 350 requests the service control system (Service Control Point: SCP) 610 to disconnect the call to the intelligent network service exchange (Service) Switching Point: SSP (600) sends a recovery completion signal to complete all operations. Or when the call termination state is input from the caller to the intelligent network service switching point (SSP) 600, the call termination state is notified to the service control system (SCP) 610, The Service Control Point (SCP) 610 instructs the Intelligent Network Service Switching Point (SSP) 600 to release the connection with the service gateway 350 to close the call channel, thereby closing the service gateway ( 350 transfers the BYE SIP message to the Internet phone terminal 340 and completes all operations by closing the call channel between the service gateway 350 and the Internet phone terminal 340.

As described above, the Internet call forwarding service in the mobile communication system according to the preferred embodiment of the present invention combines the voice / data integrated network and the wireless intelligent network to provide the Internet call forwarding service in the mobile communication network. Implemented based on the SIP protocol, which is emerging as a service protocol and the next generation network (NGN) based protocol, and the Parlay API technology (Parlay / OSA (Open Service Architecture)), a kind of open communication application specification (API). The purpose of the present invention is to provide a service interworking device for a wireless intelligent network and a voice / data integrated network.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, and may be modified and modified within the scope not departing from the gist of the present invention. It is to be regarded as equivalent to the scope of the claims as well as the scope.

As described in detail above, the system method proposed by the present invention is a Parlay API technology (Parlay), which is a kind of open communication application standard (API) centering on SIP protocol, which is emerging as a base protocol of Next Generation Network (NGN). NGN (Next Generation Network) is an Internet telephony system that provides integrated network service function by interworking existing wireless communication network and Internet network based on Open Service Architecture (OSA). The next generation system shape required by the advanced technology with the service system structure will be able to contribute to the export of platform and service abroad with technical advantage through international patents.

In addition, by extending the mobile phone service subscriber's call from the mobile communication network to the Internet network, the service subscriber not only can receive various calling services but also enjoy the service to receive calls from his / her number from anywhere in the world where the Internet service is available. In addition, domestic wireless carriers can expand the scope of mobile phone service subscriptions not only to domestic service subscribers but also to overseas service subscribers working in overseas offices or overseas offices of domestic companies. In the international telephone service market, a subscriber who is abroad or who is temporarily out of the country does not utilize the international telephone service of an overseas telephone company. By using the telephone service directly on the Internet through the service, subscribers can have convenience and economy of services regardless of the place or space without unnecessary foreign currency expenditures. It can have various economic effects, such as promotion.

Claims (6)

An Internet phone terminal, which is a SIP-based client that operates an Internet call forwarding service call; Internet call forwarding service originating from wireless switching network is interlocked with wireless intelligent network service systems and transmits and matches information between internet network and existing wireless telephone network using No.7 protocol. It converts and transmits voice signal of wireless network into voice data packet and converts voice data packet of internet into voice analog signal and processes it as SIP gateway based gateway function and service gateway station interworking with wireless intelligent network. Service gateway; And Parlay API, an open communication API that manages and controls Internet call forwarding services in a phone-to-PC manner in the Internet environment, not the subscriber's wireless terminal, for calls from wired or wireless telephone networks. Based application server; Consist of Method and system for providing Internet call forwarding service in mobile communication system which can provide integrated network service by interworking wireless network and internet network. The method of claim 1, The signal exchange between the service gateway and the wireless network intelligent network service system of the mobile communication system is a 3G network, a CAP / No.7 protocol scheme, which is the basic protocol of the 3G network, and a 2.5G network, a Win / No. It is interworking with 7 protocol system and service gateway supports No. ITU-T White Book Version. 7 stacks and No7. It is composed of a signal processing unit responsible for the signal control layer for processing the signal system and a voice processing layer (SIP Trunk Gateway) in charge of the voice transmission layer by tightly coupled with the voice system of the wireless intelligent network, and performs signal and call processing, IP-based call service control processing (IP-SCP: IP-Service Control Point) and calls such as SIP protocol-based gateway function, proxy server function, and registration server function to link incoming calls from wireless intelligent network service system to Internet network. A method and system for providing an Internet call forwarding service in a mobile communication system, comprising a service control structure having an IP-SSP (IP-Service Switching Point) function. The method of claim 1, The application server and the service gateway are connected to a Parlay API-based service interface implemented as an open API, and perform data communication with each other, so that an open communication API for managing and controlling an Internet call forwarding service is provided. Method and system for providing Internet call forwarding service in mobile communication system, characterized by API-based service control structure. The method of claim 1, The signaling exchange between the service gateway and the SIP subscriber's SIP-based Internet telephone terminal is a signal control layer and an RTP protocol for processing SIP protocol signaling based on the SIP protocol, which is emerging as a foundation protocol of Next Generation Network (NGN). A method and system for providing an Internet call forwarding service in a mobile communication system, comprising: a voice transport layer to perform signal and call processing. The method according to claim 2, 3, 4, The service gateway is specifically designed to closely bind to the CAP / No.7 or Win / No.7 protocol scheme of the wireless intelligent network. 7 stacks and No7. A signal processing unit (signaling gateway) for processing a signal method and in charge of a signal control layer; A call processing unit (SIP Trunk Gateway) which is tightly coupled to the voice system of the wireless intelligent network and is in charge of the voice transmission layer; A packet processing unit (SIP Packet Gateway) of a SIP protocol-based gateway function located between the wireless switching network and the Internet network and converting media into a data format suitable for the transmission format of the network together with the call processing unit; It controls the SIP network and acts like a gatekeeper in H.323 and acts as a proxy server that acts as a router for the application layer forwarding SIP requests / responses and other recipients. A proxy server performing a redirect server function to inform a client of a server location; Location Server function that manages session of terminal in SIP network and stores subscriber's data and service, and registers that SIP user terminal registers as part of SIP network by tracking user's location A registration server (SIP Location / Registrar Server) that performs a server function to update and manage information on a user's current location; A service control unit (IP-SCP: IP-Service Control Point) that is in charge of packet-based service logic control and call processing control by implementing Internet intelligent network service logic interworking with an existing wireless intelligent network; An operation management unit performing various operation management functions; A DB storage unit performing all data storage, processing, and management functions required to perform a service function; An external interworking unit that performs various external interworking and communication functions and transmits subscriber information such as service subscription and termination to the CCS 630 and the BS 620, the SCP 610, the HLR 160, and the like; A service gateway system for an Internet call forwarding service in a mobile communication system, comprising: a signal and call processing between a wireless network and an internet network. The method of claim 1, In order to receive the Internet call forwarding service in the mobile communication system, A first step of making a service subscription request through a call center, the Internet, a mobile terminal; A second step of transmitting, by the subscriber, an internet call forwarding service setting request through a mobile phone terminal device, a soft phone, or an internet phone terminal to receive an internet call forwarding service for an incoming call regardless of the state of the mobile phone; When the subscriber makes a request for setting up an Internet call forwarding service using a mobile phone terminal device on a wireless telephone network or requests for setting up an Internet call forwarding service through an Internet phone terminal on an Internet network, Preparing a mobility guarantee for Internet call roaming; The registration processing, session registration status and location information of the Internet phone terminal session of the subscriber in which the Internet call forwarding service is set is always registered and managed by a service gateway based on the SIP-based protocol. A fourth step of enabling the home location register (HLR) to always manage the status of service subscribers in association with the control system; Internet call waiting state that allows the subscriber's Internet phone terminal, which has the Internet call forwarding service set up, to register the session through the above steps on the SIP network and establish a call connection from the wireless intelligent network service system to the service gateway for the subscriber's incoming call. The fifth step; When the call is waiting for Internet call forwarding on the SIP network, the call is connected to the service gateway from the wireless intelligent network service system for the call from the originator to the mobile terminal of the subscriber, and the service gateway receives the call through the interface with the application server. A sixth step of opening a voice call channel according to the SIP protocol between the call and the subscriber's Internet phone terminal to establish a voice call by interworking the wireless network with the Internet network; A seventh step in which the call is made in the above state and the call is terminated between the users to terminate all calls on the wireless network and the Internet network; When the subscriber requests to cancel the Internet call forwarding service setting by using a mobile phone terminal device on the wireless telephone network or requests to cancel the Internet call forwarding service setting through the Internet phone terminal on the Internet network, An eighth step of preparing a general voice call service to a terminal; Method and system for providing Internet call forwarding service in a mobile communication system, characterized in that made.