KR101144590B1 - Voice call continuity gageway providing voice call continuity service associating wiht internet protocol based private branch exchange and method of providing voice call continiuity service using the same - Google Patents

Abstract

A method of providing a Voice Call Continuity (VCC) service interworking with an IP-PBX (IP-PBX) is disclosed. The method for providing a VCC service may include (A) a VCC service for an IP Multimedia Subsystem (IMS) network based on outgoing call attempt information from a first terminal connected to an IP-based premises exchange to a second terminal. Requesting a routing number; (B) receiving, at the VCC gateway, a response message including an assigned routing number from the IMS network; And (C) in the VCC gateway, transmitting the routing number and the outgoing call attempt information to the IMS network through the Internet telephone network by using the IP-based premises exchange, so that the routing number and the outgoing call attempt in the IMS network. Anchoring information so that the call proceeds to the second terminal.

Description

VOC CALL CONTINUITY GAGEWAY PROVIDING VOICE CALL CONTINUITY SERVICE ASSOCIATING WIHT INTERNET PROTOCOL BASED PRIVATE BRANCH EXCHANGE AND METHOD OF PROVALLING

The present invention relates to a voice call continuity technology, and more particularly, a subscriber of an IP-based Internet Protocol Private Branch eXchange using Dual Band Dual Mode is a subscriber of a VCC AS ( The present invention relates to a VCC gateway and a method of providing a VCC service using the same, wherein the VCC gateway can be provided using an Internet Protocol Multimedia Subsystem (IMS) network including an application server.

VCC service means providing a seamless voice service to a terminal even under limited coverage between heterogeneous networks (eg, between a wireless LAN network and a mobile communication network) using a VCC AS of an IMS network. .

Currently, the VCC service includes a mobile communication network (eg, Global System for Mobile communication (GSM) network, an Internet Protocol Multimedia Subsystem (IMS) network, a Cession Control Function (CSCF), and a Home Subscriber Server (HSS)) performed by the VCC AS. It is provided to service subscribers through interworking.

In order to provide VCC services, all calls of VCC subscribers must be anchored by VCC AS. Currently, interworking technology for providing VCC services between an IP-PBX network and an IMS network has not been developed. Therefore, in order to enable the VCC service using the IP-PBX network, a technology for transmitting location registration information of the subscriber of the IP-PBX network and call information originating / receiving through the IP-PBX is required.

Therefore, the technical problem to be achieved by the present invention is to interwork with IP-PBX by providing VCC services to IP-PBX network subscribers using dual band dual mode (DBDM) terminals by interworking between IP-PBX network and IMS networks. It is to provide a VCC gateway for providing a VCC service and a VCC service method using the same.

According to an aspect of the present invention, there is provided a method for providing a VCC service interworking with an IP-based premises exchange according to an embodiment of the present invention. Requesting a routing number for a VCC service to an IP Multimedia Subsystem (IMS) network based on outgoing call attempt information to a second terminal received from a first terminal connected to a Private Branch eXchange; (B) receiving, at the VCC gateway, a response message including an assigned routing number from the IMS network; And (C) in the VCC gateway, transmitting the routing number and the outgoing call attempt information to the IMS network through the Internet telephone network by using the IP-based premises exchange, so that the routing number and the outgoing call attempt in the IMS network. Anchoring information so that the call proceeds to the second terminal.

According to another aspect of the present invention, there is provided a method for providing a VCC service interworking with an IP-based branch exchange according to an embodiment of the present invention. Requesting a routing number for a VCC service to an IP Multimedia Subsystem (IMS) network based on incoming call attempt information on a first terminal connected to an IP-PBX: IP-PBX; (B) receiving, at the VCC gateway, a response message including an assigned routing number from the IMS network; (C) in the VCC gateway, transmitting the routing number and the incoming call attempt information to the IMS network through the Internet telephone network using the IP-based premises exchange, and the routing number and the incoming call attempt information in the IMS network. Anchoring to perform call processing to the VCC gateway; And (D) in the VCC gateway, forwarding a call to the first terminal based on the routing number received by the call processing by the IMS network.

The VCC gateway providing a VCC service in conjunction with an IP-based premises exchange according to an embodiment of the present invention for solving the technical problem may include a server interworking module and a call processing module. The server interworking module transmits a VCC to an IP Multimedia Subsystem (IMS) network based on outgoing call attempt information to a second terminal received from a first terminal connected to an IP-based Private Branch eXchange (IP-PBX). A routing number for a service may be requested, and a response message including the routing number allocated from the IMS network may be received and transmitted to the IP-based premises exchange.

The call processing module transmits the routing number and the outgoing call attempt information to the IMS network through an internet telephone network by using the IP-based premises exchange, thereby anchoring the routing number and the outgoing call attempt information in the IMS network. Anchoring may allow the call to proceed to the second terminal.

The VCC gateway providing a VCC service in conjunction with an IP-based premises exchange according to another embodiment of the present invention for solving the technical problem may include a server interworking module and a call processing module. The server interworking module transmits a VCC to an IP Multimedia Subsystem (IMS) network based on incoming call attempt information on a first terminal connected to an IP-PBX (IP-Private Branch eXchange) received from a second terminal. Request a routing number for a service, and receive a response message including the assigned routing number from the IMS network.

The call processing module transmits the routing number and the incoming call attempt information to the IMS network through the Internet telephone network using the IP-based local area network switch, and transmits the routing number and the incoming call attempt information to the first terminal based on the routing number received from the IMS network. You can proceed with the call. In this case, the routing number received from the IMS network is anchored to the routing number and the incoming call attempt information in the IMS network, and the call processing module is subjected to the call processing module based on the anchoring result. Can be generated based on this.

As described above, the VCC gateway for interworking with the IP-PBX according to the present invention to provide a VCC service, and the VCC service method using the VCC gateway are configured to send outgoing calls from the IP-PBX and incoming calls to the IP-PBX. By interworking with the AS, it is possible to provide VCC services to subscribers of IP-PBX networks that cannot perform functions such as CSCF and HSS.

1 is a diagram illustrating a connection relationship with other networks of an IP-PBX network including a VCC gateway according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating in more detail a connection relationship with other networks of an IP-PBX network including the VCC gateway shown in FIG. 1.
FIG. 3 is a block diagram of the VCC gateway shown in FIG. 1.
4 is a flowchart illustrating a process in which a call is originated from a first terminal connected to an IP-PBX to a second terminal by the VCC gateway illustrated in FIG. 1.
FIG. 5 is a flowchart illustrating a process in which a call is received from a second terminal to a first terminal connected to an IP-PBX by the VCC gateway illustrated in FIG. 1.

Specific structural to functional descriptions of embodiments according to the inventive concept disclosed in the specification or the application are only illustrated for the purpose of describing embodiments according to the inventive concept, and according to the inventive concept. The examples may be embodied in various forms and should not be construed as limited to the embodiments set forth herein or in the application.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

 For example, when one component 'transmits or outputs' data or a signal to another component, the component may 'transmit or output' the data or signal directly to the other component, and at least one This means that the data or signal may be transmitted or output to the other component through another component of.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

FIG. 1 shows an IP-based private branch exchange (hereinafter referred to as 'IP-PBX') in an IP-based private branch eXchange network (hereinafter referred to as 'IP-PBX network'). 120 is a diagram showing a connection relationship with other networks of the VCC gateway 110 according to an embodiment of the present invention for providing a voice call continuity service (hereinafter referred to as 'VCC') in conjunction with ..

Referring to FIG. 1, the VCC gateway 110 is an IP phone 130 in the IP-PBX network 100, a dual band dual mode phone (hereinafter referred to as a DBDM terminal). , 140) and the like, may be connected between the IP-PBX 120 and the IP-PBX 120, and may be connected to the IP-Centrex network 200 and the VCC of the IMS network (Internet protocol Multimedia Subsystem network 400). It may also be connected to an application server (VCC Application Server: VCC AS 410). For reference, the IP-Centrex network 200 shown in FIG. 1 is a type of Internet telephone network, and the IP-Centrex network 200 may be a soft switch 210 (hereinafter referred to as SSW) and an SBC ( It may be connected to a wired telephone network (PSTN network) through a Session Boarder Controller (hereinafter referred to as SBC).

The VCC gateway 110 helps the VCC AS 410 to anchor the call of the VCC service subscriber of the IP-PBX 120 in the IP-PBX network 100. Can play a role. That is, the VCC gateway 110 is configured such that all calls pass through the VCC gateway 110 when the call is sent from the IP-PBX network 100 or the call is received by the IP-PBX network 100. 120) and serves as a gateway.

In addition, the VCC gateway 110 should transmit the call / outgoing information of the subscriber to the VCC AS 410. For this purpose, the VCC AS (Internet Protocol: hereinafter referred to as 'IP') is used. 410 and SIP may be linked according to the Session Initiation Protocol (SIP).

Then, the VCC AS 410 performs a seamless handover function between heterogeneous networks (for example, between a wireless LAN network and a mobile communication network), and the VCC gateway 110 according to an embodiment of the present invention. It can be connected to the subscriber station to provide continuous voice service subscribers even in limited coverage situations such as the IP-PBX network 100.

In this case, the subscriber's terminal may be connected to the IP-PBX network 100 according to a predetermined standard (for example, WiFi standard), and may be connected to another communication network (for example, mobile communication network) according to a different standard from the predetermined standard. DBDM terminal that can be connected. More specifically, the terminal device of the subscriber may be a terminal of a DBDM subscriber using an extension WiFi network in which a CS network (Circuit Switched Network) and an IP-PBX exist. In the present specification, a terminal of the subscriber will be described using a DBDM terminal using an extension WiFi network in which a CS network (Circuit Switched Network) and an IP-PBX exist, but the scope of the present invention is not limited thereto.

FIG. 2 is a diagram illustrating in detail the connection relationship between the IP-PBX network 100 including the VCC gateway 110 shown in FIG. 1 and other networks. 2, the IP-PBX network 100 is connected to a mobile communication network (CS network: Circuit Switched Network, 500) in addition to the IP-Centrex network 200 and the IMS network 400 shown in FIG. . That is, the VCC gateway 110 according to the embodiment of the present invention shown in FIG. 2 is a node that enables a VCC service (ie, handover) between the IP-PBX network 100 and the CS network 500. Play a role.

The structures and functions of the IP-Centrex network 200, the IMS network 400, and the CS network 500 are well known to those skilled in the art to which the present invention pertains. Description is omitted.

3 is a block diagram of the VCC gateway 100 shown in FIG. Referring to FIG. 3, the VCC gateway 110 includes a server interworking module 111, a call processing module 112, and a mapping table 113.

When a call is originated from the IP-PBX network 100, the server interworking module 111 receives outgoing call attempt information from a first terminal connected to the IP-PBX 120 to the second terminal. The routing number for the VCC service may be requested to the IMS network 400 based on the outgoing call attempt information.

When the call is received to the IP-PBX network 100, the server interworking module 111 receives the incoming call attempt information on the first terminal connected to the IP-PBX 120 received from the second terminal, The routing number for the VCC service may be requested to the IMS network 400 based on the incoming call attempt information.

In more detail, the server interworking module 111 transmits a routing number based on the outgoing call attempt information and the incoming call attempt information based on the Session Initiation Protocol (SIP) to determine the VCC AS () of the IMS network 400. 410 and receive the response message from the VCC AS 410.

If the number of the first terminal or the second terminal included in the outgoing call attempt information and the incoming call attempt information is an extension number linked to the IP-PBX 120, the server interworking module 111 The routing number may be requested to the VCC AS 410 by converting the number of the first terminal or the second terminal into an outside line number.

The extension number and the extension number corresponding to the extension number may be stored in the mapping table 113. That is, the VCC gateway 110 manages extension and external number information of the IP-PBX network 100.

Thereafter, the server interworking module 111 may transmit a response message including a routing number allocated for the VCC service from the IMS network 400 to the IP-PBX 120.

When the call is sent from the first terminal to the second terminal of the IP-PBX network 100, the call processing module 112 uses the IP-PBX 120 to transmit the routing number and the outgoing call attempt information to the Internet telephone network. It can be transmitted to the IMS network 400 through. Here, the Internet telephone network may be an IP-Centrex network 200 as shown in FIGS. 1 and 2.

 In this case, the call processing module 112 controls the call to proceed to the second terminal by anchoring the routing number and the originating call attempt information in the IMS network 400. Hereinafter, the call processing process in the IMS network 400 will be described in more detail.

A Call Session Control Function (CSCF) 420 of the IMS network 400 may receive the routing number and the outgoing call attempt information transmitted from the IP-PBX 120 and transmit the received call attempt information to the VCC AS 410. Then, the VCC AS 410 anchors the routing number and the originating call attempt information received from the CSCF 420 to control the CSCF 420 so that the CSCF 420 receives the second. The call can be made to the terminal.

When a call is received from a second terminal to a first terminal of the IP-PBX network 100, the call processing module 112 transmits the routing number and incoming call attempt information to the IP-PBX 120 through an internet network. Can be sent to. Then, the IP-PBX 120 transmits the routing number and the incoming call attempt information to the IMS network 400 and receives from the IMS network 400 in response to the routing number and the incoming call attempt information. The call to the first terminal can be made based on the routing number.

In this case, the routing number received from the IMS network 400 anchors the routing number and the incoming call attempt information in the IMS network 400, and the call processing based on the anchoring result. This may occur based on call processing to module 112. Hereinafter, the call processing process in the IMS network 400 will be described in more detail.

The CSCF 420 may receive the routing number and the incoming call attempt information from the IP-PBX 120 through the Internet telephone network and transmit the received routing number to the VCC AS 410. Then, the VCC AS 410 may anchor the routing number and the incoming call attempt information received from the CSCF 420 to transmit the routing number to the CSCF 420.

Then, the CSCF 420 may transmit the routing number to the call processing module 112 through the Internet telephone network. The call processing module 112 then sends the routing number received from the CSCF 420 to the VCC AS 410, receives a response message based thereon from the VCC AS 410, and receives from the VCC AS. The call may be sent to the first terminal based on the response message.

FIG. 4 is a flowchart illustrating a process in which a call is transmitted from a first terminal VCC UE # 1 connected to an IP-PBX to a second terminal UE # 2 by the VCC gateway 110 illustrated in FIG. 1. Hereinafter, the process will be described sequentially with reference to FIGS. 2 to 4.

The VCC gateway 110 receives outgoing call attempt information (INVITE (UE # 1, UE # 2)) from the first terminal (VCC UE # 1) (S40). As shown in FIG. 4, the originating call attempt information includes the number UE # 1 of the first terminal VCC UE # 1 and the number UE # 2 of the second terminal UE # 2. It is.

Then, the VCC gateway 110 requests a VCC AS Routing Number (hereinafter referred to as 'VARN') to the VCC AS 410 based on the outgoing call information (S41). In this case, the number UE # 1 of the first terminal VCC UE # 1 and the number UE # 2 of the second terminal UE # 2 are extension numbers in the IP-PBX network 100. In this case, the VCC gateway 110 converts the extension numbers into the external numbers UE # 1 'and UE # 2' stored in the mapping table 113 and transmits them to the VCC AS 410. In this case, the converted outer line numbers UE # 1 'and UE # 2' are stored in the VCC AS 410.

Then, the VCC gateway 110 sends a response message (200 OK (UE # 1 '/ VARN)) including the routing number VARN and the converted external number UE # 1' of the calling terminal to the VCC. It receives from the AS (410) (S42), and transmits the routing number (VARN) and the converted external number (UE # 1 ') of the calling terminal to the IP-PBX (120) (S43).

The IP-PBX 120 transmits the received routing number VARN and the converted external number UE # 1 'of the calling terminal via the SBC / SSW 220/210 of the Internet telephone network (S44). It transmits to the CSCF 420 of the IMS network 400 (S45). Then, the CSCF 420 transmits the routing number VARN and the converted external number UE # 1 'of the calling terminal to the VCC AS 410 (S46).

The VCC AS 410 anchors the routing number VARN and the converted outer number UE # 1 'of the calling terminal (S47), and the result is INVITE (UE # 1', UE # 2 '. )) Is transmitted to the CSCF 420 (S48). Then, the CSCF 420 advances the call to the second terminal UE # 2 based on the anchoring result received from the VCC AS 410 (S49).

FIG. 5 is a flowchart illustrating a process in which a call is received from the second terminal UE # 2 to the first terminal VCC UE # 1 connected to the IP-PBX 120 by the VCC gateway 110 shown in FIG. 1. . Hereinafter, the process will be described in detail with reference to FIGS. 2 to 5.

The VCC gateway 110 receives the incoming call attempt information (INVITE (UE # 2, UE # 1)) from the second terminal UE # 2 (S50). As shown in FIGS. 4 and 5, the incoming call attempt information includes a number UE # 1 of the first terminal VCC UE # 1 and a number UE # 2 of the second terminal UE # 2. ) Is included.

Then, the VCC gateway 110 requests a routing number (VARN) for the VCC service to the VCC AS 410 based on the outgoing call information (S51). In this case, the number UE # 1 of the first terminal VCC UE # 1 and the number UE # 2 of the second terminal UE # 2 are extension numbers in the IP-PBX network 100. In this case, the VCC gateway 110 converts the extension numbers into the external numbers UE # 1 'and UE # 2' stored in the mapping table 113 and transmits them to the VCC AS 410. In this case, the converted outer line numbers UE # 1 'and UE # 2' are stored in the VCC AS 410.

Then, the VCC gateway 110 sends a response message (200 OK (UE # 2 '/ VARN)) including the routing number VARN and the converted external number UE # 2' of the calling terminal to the VCC. It receives from the AS (410) (S52), and transmits the routing number (VARN) and the converted external number (UE # 2 ') of the calling terminal to the IP-PBX (120) (S53).

The IP-PBX 120 transmits the received routing number VARN and the converted external number UE # 2 'of the calling terminal via the SBC / SSW 220/210 of the Internet telephone network (S54). It transmits to the CSCF 420 of the IMS network 400 (S55). Then, the CSCF 420 transmits the routing number VARN and the converted external number UE # 2 'of the calling terminal to the VCC AS 410 (S56).

The VCC AS 410 anchors the routing number VARN and the converted external number UE # 2 'of the calling terminal (S57), and the result (INVITE (VARN, VCCGW)) is converted into the CSCF ( 420, and transmits (S58). Then, the CSCF 420 performs call processing based on the anchoring result (INVITE (VARN, VCCGW)) (S59), and sends the call processing result to the SBC / SSW (220/210) and the IP of the Internet telephone network. Transmit to the VCC gateway 110 via the PBX 120 (S60, S61).

Then, the VCC gateway 110 requests a routing number (VARN) for a VCC service to the VCC AS 410 based on the outgoing call information (S62), and the response message 200 from the VCC AS 410. OK (UE # 1 '/ UE # 2') is received (S63), and the call proceeds to the first terminal (VCC UE # 1) on the basis (S64).

On the other hand, the components of the VCC gateway 110, part, or a combination thereof to perform a method for providing VCC service according to an embodiment of the present invention and software, hardware, or software for carrying out the technical spirit of the present invention and It can be implemented by a combination of hardware.

The VCC service providing method interworking with the IP-based premises exchange according to the embodiment of the present invention may also be implemented as computer readable codes on a computer readable recording medium. The VCC service providing method interworking with the IP-based branch exchange according to the embodiment of the present invention is implemented by executing a computer program for executing the VCC service providing method interoperating with the IP-based branch exchange stored in a computer-readable recording medium. Can be.

The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. For example, computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. Functional programs, codes, and code segments for implementing a VCC service providing method interworking with an IP-based branch exchange according to an embodiment of the present invention can be easily inferred by programmers in the art to which the present invention belongs. Can be.

Although the invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: IP-PBX network 110: VCC gateway
111: server interworking module 112: call processing module
113: mapping table 120: IP-PBX
200: IP-Centrex network 210: SSW
220: SBC 300: landline
400: IMS network 410: VCC AS
420: CSCF

Claims (20)

(A) In a Voice Call Continuity (VCC) gateway, an IMS (IMS) based on outgoing call attempt information to a second terminal received from a first terminal connected to an IP-PBX (IP-Private Branch eXchange). Requesting a routing number for a VCC service to an IP Multimedia Subsystem network;
(B) receiving, at the VCC gateway, a response message including a routing number assigned from the IMS network; And
(C) the VCC gateway transmits the routing number and the outgoing call attempt information to the IMS network through an internet telephone network using the IP-based local area network, so that the routing number and the outgoing call attempt information in the IMS network. Anchoring the VCC service interworking with the IP-based local exchange comprising the step of proceeding the call to the second terminal. The method of claim 1, wherein in the steps (A) and (B), the VCC gateway is
IP based on the call initiation information based on the Session Initiation Protocol (SIP) to request the routing number to the VCC AS (Application Server) of the IMS network, and receives the response message from the VCC AS How to provide VCC service interworking with the base branch exchange. The method of claim 2, wherein in the steps (A) and (B), the VCC gateway is
If the number of the first terminal or the second terminal included in the outgoing call attempt information is an extension number linked to the IP-based premises exchange, an external line stored in the mapping table with the number of the first terminal or the second terminal And converting the number to request the routing number from the VCC AS. The method of claim 1, wherein in the step (C), the Internet telephone network is
A method of providing a VCC service interworking with an IP-based premises exchange, characterized in that it is an IP-Centrex network. The method of claim 2, wherein in the step (C), allowing the call to proceed to the second terminal by the IMS network
(C1) in the Call Cession Control Function (CSCF) of the IMS network, receiving the routing number and the outgoing call attempt information through the Internet telephone network and transmitting them to the VCC AS; And
(C2) at the VCC AS, anchoring the routing number and the outgoing call attempt information received from the CSCF to cause the CSCF to proceed with the call to the second terminal. How to provide VCC service linked with exchange. The method of claim 1, wherein the first terminal
VCC service interworking with the IP-based on-premises exchange, characterized in that connected to the IP-based on-premises exchange via a wireless LAN network. (A) At the Voice Call Continuity (VCC) gateway, an IMS (IMS) is based on the incoming call attempt information for the first terminal connected to the IP-based Private Branch eXchange (IP-PBX) received from the second terminal. Requesting a routing number for a VCC service to an IP Multimedia Subsystem network;
(B) receiving, at the VCC gateway, a response message including an assigned routing number from the IMS network;
(C) in the VCC gateway, transmitting the routing number and the incoming call attempt information to the IMS network through the Internet telephone network using the IP-based premises exchange, and the routing number and the incoming call attempt information in the IMS network. Anchoring to perform call processing to the VCC gateway; And
(D) in the VCC gateway, the VCC service interworking with the IP-based local exchange comprising the step of proceeding to the first terminal based on the routing number received by the call processing by the IMS network. The method of claim 7, wherein in the steps (A) and (B), the VCC gateway is
IP requesting the routing number to the VCC AS of the IMS network based on the incoming call attempt information based on the Session Initiation Protocol (SIP), and receiving the response message from the VCC AS. How to provide VCC service interworking with the base branch exchange. The method of claim 8, wherein in the steps (A) and (B), the VCC gateway is
If the number of the first terminal or the second terminal included in the incoming call attempt information is an extension number linked to the IP-based premises exchange, an external line stored in the mapping table with the number of the first terminal or the second terminal And converting the number to request the routing number from the VCC AS. 8. The method of claim 7, wherein in the step (C), the Internet telephone network is
A method of providing a VCC service interworking with an IP-based premises exchange, characterized in that the IP-Centrex network. The method of claim 8, wherein step (C)
(C1) receiving, at the Call Cession Control Function (CSCF) of the IMS network, the routing number and the incoming call attempt information through the Internet telephone network and transmitting to the VCC AS;
(C2) at the VCC AS, anchoring the routing number and the incoming call attempt information received from the CSCF to send the routing number to the CSCF; And
(C3) a method for providing a VCC service interworking with an IP-based local branch exchange, in the CSCF, transmitting the routing number to the VCC gateway via the Internet telephone network. The method of claim 7, wherein the first terminal is
VCC service interworking with the IP-based on-premises exchange, characterized in that connected to the IP-based on-premises exchange via a wireless LAN network. The method of claim 11, wherein in the step (D), the step of proceeding to the call to the first terminal
(D1) at the VCC gateway, transmitting a routing number received from the CSCF to the VCC AS and receiving a response message from the VCC AS; And
And (D2) in the VCC gateway, forwarding a call to the first terminal based on a response message received from the VCC AS. Routing number for VCC service in IP Multimedia Subsystem (IMS) network based on outgoing call attempt information from the first terminal connected to IP-PBX (IP-PBX: IP-Private Branch eXchange) to the second terminal A server interworking module for requesting and receiving a response message including the assigned routing number from the IMS network and transmitting the received response message to the IP-based premises exchange; And
The routing number and the outgoing call attempt information are transmitted to the IMS network through an internet telephone network by using the IP-based on-premises exchange, and the routing number and the outgoing call attempt information are anchored in the IMS network. A VCC gateway providing a VCC service in conjunction with an IP-based premises exchange that includes a call processing module that allows a call to proceed to a second terminal. The method of claim 14, wherein the server interworking module
IP requesting the routing number to the VCC AS of the IMS network based on the outgoing call attempt information based on the Session Initiation Protocol (SIP), and receiving the response message from the VCC AS. A VCC gateway that provides VCC services in conjunction with a base branch exchange. The method of claim 15, wherein the server interworking module
When the number of the first terminal or the second terminal included in the outgoing call attempt information is an extension number linked to the IP-based premises exchange, the number of the first terminal or the second terminal is converted into an external number. A VCC gateway providing a VCC service in conjunction with an IP-based premises exchange, characterized in that requesting the routing number to the VCC AS. The method of claim 16, wherein the VCC gateway is
And a mapping table for storing the extension number and the extension number corresponding to the extension number. The method of claim 15, wherein the IMS network
And a Call Cession Control Function (CSCF) for receiving the routing number and the outgoing call attempt information through the Internet telephone network and transmitting the same to the VCC AS.
The VCC AS
Anchoring the routing number and the outgoing call attempt information received from the CSCF to allow the CSCF to proceed with the call to the second terminal to provide a VCC service in conjunction with an IP-based local exchange. VCC Gateway. Routing number for the VCC service to the IP Multimedia Subsystem (IMS) network based on the incoming call attempt information for the first terminal connected to the IP-PBX (IP-Private Branch eXchange) received from the second terminal. A server interworking module for requesting and receiving a response message including a routing number assigned from the IMS network; And
Transmitting the routing number and the incoming call attempt information to the IMS network through the Internet telephone network using the IP-based local exchange, and proceeding to the first terminal based on the routing number received from the IMS network. A call processing module,
The routing number received from the IMS network is
IP based premises, wherein the routing number and the incoming call attempt information are anchored in the IMS network, and generated based on the call processing to the call processing module based on the anchoring result. A VCC gateway that provides VCC services in conjunction with an exchange. The server interworking module of claim 19,
IP requesting the routing number to the VCC AS of the IMS network based on the incoming call attempt information based on the Session Initiation Protocol (SIP), and receiving the response message from the VCC AS. A VCC gateway that provides VCC services in conjunction with a base branch exchange.

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