KR20150026235A - Method, apparatus and system for providing single radio voice call continuity integrated call control - Google Patents

Abstract

Provided is a method for providing single radio voice call continuity integrated with call processing, which comprises the steps of: receiving, from a wireless terminal that is connected to a first network and has transmitted an originating call, an invite message based on a handover request from the first network to a second network via a call status management apparatus; checking whether a subscriber who uses the wireless terminal is a subscriber to an intelligent network; and transmitting an error response to the invite message from the wireless terminal to a terminal switching node if the subscriber is the subscriber to the intelligent network as a result of the determination.

Description

METHOD AND APPARATUS AND SYSTEM FOR PROVIDING SINGLE RADIO VOICE CALL CONTINUITY INTEGRATED CALL CONTROL BACKGROUND OF THE INVENTION [0001]

The present invention relates to a method and apparatus for providing call continuity, and more particularly, to a method, apparatus, and system capable of preventing network resource consumption due to call processing by integrating TAS and SCC AS.

Recently, as the spread of wireless terminals such as smart pads, tablet PCs, and smartphones has increased, wireless terminals using LTE networks have been increasing in order to provide better services than 3G.

At this time, a method of processing a call of a wireless terminal is performed by a method in which a network device transmits a SIP signaling message instead of a wireless terminal. In this regard, Korean Patent Laid-Open Publication No. 2009-0035705 (published on Apr. 10, 2009) discloses a method in which an intra-network device does not transmit a SIP signaling message to / from a wireless terminal when a call is connected have.

However, if the SRVCC of the wireless terminal is provided in the IMS network, the call processing must proceed in the order of SRVCC, IN AS, and TAS. In the case of constructing a plurality of ASs, the call processing resources of the CSCF are consumed in addition to the cost of building the AS.

Korean Patent Publication No. 2009-0035705 (published on Apr. 10, 2009) discloses "call connection processing method and message sending / receiving proxy device ".

In an embodiment of the present invention, when the SCC AS / TAS is integrated with the SCC AS / TAS and the SRVCC is provided to the mobile station, the SCC AS / TAS is preferentially passed through the outgoing call, A method of providing an integrated call continuity of call processing in which the MSC triggers a priority call to the IN AS when the subscriber of the wireless terminal is determined to be the subscriber of the intelligent network by rejecting an outgoing call of the wireless terminal, And a system. It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a method for transmitting a handover request from a first network to a second network, the method comprising: Based on the invite message, whether the subscriber using the wireless terminal is an intelligent network subscriber, and if the subscriber is an intelligent network subscriber , And transmitting an error response to the invite message of the wireless terminal to the terminal switching node.

According to any one of the above-mentioned objects of the present invention, there is no need to construct a plurality of application servers, thereby reducing the construction cost and reducing network resources due to call processing.

1 is a block diagram illustrating a data network system according to an embodiment of the present invention.
2 is a block diagram illustrating an apparatus for providing call processing integrated call continuity according to an embodiment of the present invention.
3 is a diagram illustrating a process in which data is transmitted and received between the respective components included in the data network system of FIG. 1 according to an embodiment of the present invention.
4 is a flowchart illustrating an operation for providing call processing integrated call continuity according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a data network system according to an embodiment of the present invention. 1, the data network system 1 may include a UE (User Equipment) 100, a first network 300, a second network 500, and an IP Multimedia Subsystem 700 have. The first network 300 includes a Node B 310, a Radio Network Controller 320, a Mobile Switching Center (MSC) 330, a Gateway MSC 340, a Public Switched Telephone Network 350 A Service Control Point (SCP) 360, a Serving GPRS Support Node (SGSN) 370, a Gateway GPRS Support Node (GGSN) 380, and a PDN (Public Data Network) The second network 500 includes an Evolved Node B 510, a Serving Gateway 520, a Mobility Management Entity 530, a PDW Gateway 540, an Online Charging System 550, An Offline Charging System 560, a Subscriber Profile Repository 570, a Policy and Charging Rules Function 580, and a Public Data Network 590. The IMS network 700 includes a Call Session Control Function (CSCF) 710, a Telephony Application Server / Single Radio Voice Call Continuity Application Server 720 (TAS / SCC AS), a Media Gateway Control Function (MGCF) 730, A Network Application Server 740, a Media Gate Way (MGW) 750, a Home Location Register (HLR) 760, and a Multimedia Resource Function (MRF) 770. However, since the data network system of FIG. 1 is only one embodiment of the present invention, the present invention is not limited to FIG.

Hereinafter, each component of the data network system 1 of FIG. 1 will be described in detail.

The UE 100 may be a user terminal. At this time, the UE 100 may be implemented as a terminal capable of accessing a remote server or a terminal. The UE 100 is a wireless communication device that is guaranteed to be portable and portable, for example, and can be any type of wireless communication device such as a smartphone, a smartpad, a tablet PC, etc. that can be connected to the PDN 590 And may include a handheld based wireless communication device.

The Node B 310 may serve as a base station for ensuring mobility of the UE 100. At this time, the Node B 310 can secure a frequency used for connection with the UE 100 and guarantee a stable connection with the UE 100.

The RNC 320 manages radio resources, controls a plurality of Node Bs 310, and performs management functions for interfaces between different network elements.

The MSC 330 may perform a central control function for processing an incoming or outgoing signal and adjusting the first network 300 so that the first network 300 can operate. In addition, the MSC 330 may control the radio link and the wired link, manage the location of the UE 100, and obtain the location registration information of the UE 100 from the HLR 760. At this time, the HLR 760 can transmit various information such as a calling state, an incoming state, an added service, and the location of the UE 100 to the MSC 330.

The GMSC 340 may have an automatic tracking connection function that determines the mobile switching center (VMSC) and selects and designates a call by referring to the location information of the UE 100 stored in the HLR 760.

The PSTN 350 may be a public switched telephone network. Here, a signal corresponding to a circuit service may be transmitted through the path of the MSC 330, the GMSC 340, and the PSTN 350.

The SCP 360 may include a database management function that centralizes the entire process of the intelligent network service processing, centralizes the intelligence of the network, and a service control function that has network-level service control logic. In addition, the SCP 360 can manage network configuration information and subscriber information, and can manage service control logic.

The SGSN 370 may be a node that is responsible for delivering data packets within the coverage area. At this time, the SGSN 370 may have functions such as packet routing and transmission, mobility management, logical link management, authentication and charging, and the location register of the SGSN 370 may include the GPRS user location registered in the SGSN 370 Information, user profile, and the like.

The GGSN 380 may be a node responsible for a connection function between the backbone network and the external packet data network. The GGSN 380 may convert the GPRS packet transmitted from the SGSN 370 into an appropriate packet data protocol format and transmit the PDP address of the incoming packet data to the GSM address of the receiver. The GGSN 380 may also store the address and user profile of the SGSN 370 of the current user in the location register of the SGSN 370, and may also perform a tariff function.

The PDN 390 may be a public data network, for example, the Internet or an IP network. Here, a signal corresponding to a data service (Packet Service) may be transmitted through the path of the SGSN (370), the GGSN (380), and the PDN (390).

The eNB 510 may be an LTE base station and may be a device that provides a wireless connection between the UE 100 and the LTE network. That is, the eNB 510 can connect between the SGW 520 and the UE 100, and manage the handover of the UE 100. At this time, the eNB 510 and the UE 100 can be connected wirelessly.

The SGW 520 may control the movement of the UE 100 between the 3GPP / E-UTRAN and perform an anchoring at the handover of the UE 100 of the eNB 510. [ For example, when the UE 100 is handed over from one eNB 510 to another eNB 510, handover of the UE 100 may occur on the SGW 520. [ Accordingly, the SGW 520 can operate as an anchor point in Intra-LTE mobility.

The MME 530 can control the signal between the eNB 510 and the SGW 520, determine the routing and can authenticate the UE 100. At this time, the authentication protocol of the MME 530 may be EPS-AKA, and the key information for authenticating the UE 100 may be stored in the HLR 760. Accordingly, the MME 530 can receive the key information from the HLR 760 and perform authentication for the UE 100. [ In addition, the MME 530 can manage the EPS bearer. At this time, the EPS Bearer is a logical tunnel generated between the UE 100 and the PGW 540 (UE 100-eNB 510-SGW 520 -PGW 540) And the MME 530 can control the creation, modification, and release of the tunnel.

The PGW 540 may assign an IP address to the UE 100. At this time, the IP address can be allocated through the UE 100 access procedure defined in 3GPP rather than the DHCP protocol. The PGW 540 may also perform anchoring on the SGW 520.

OCS 550 can centrally manage the remaining usage (Balance or Credit) of real-time usage for each UE 100 when Prepaid is used in UE 100. [ Here, the real-time usage amount can be managed by the PGW 540 and the remaining usage amount can be transmitted to the OCS 550. At this time, the OCS 550 can notify the PGW 540 of the information that the UE 100 using the remaining amount of usage is no longer available.

The OFCS 560 can receive and centrally manage the CDR delivered by the PGW 540.

The SPR 570 may store policy and charging rules for each UE 100. Accordingly, the PCRF 580 can fetch information about the UE 100 from the SPR 570. [

The PCRF 580 may be a device for setting rules for policies and charging for each UE 100. At this time, the policy may be QoS information to be used by the UE 100, and the billing information may be information about whether to perform offline charging or online charging.

The PDN 590 may be a public data network, for example, the Internet or an IP network.

The CSCF 710 is a function that takes charge of a part related to call processing. The CSCF 710 can be composed of ICGW (Incoming CAll GateWay), CCF (CAll Control Function), SPD (Serving Profile Database) and AH (Address handling).

The TAS / SCC AS 720 may process the call and provide continuity of the radio resources of the UE 100. At this time, the TAS / SCC AS 720 may be a server in which the TAS and the SCC AS are integrally implemented. Accordingly, when the existing SRVCC is provided, the TAS / SCC AS 720 performs call processing in the order of SCC AS-IN AS-TAS and consumes a large amount of call processing resources of the CSCF 710. Therefore, AS is implemented in an integrated manner to reduce call processing resources. In addition, the TAS / SCC AS 720 includes a subscriber database and an interworking interface, and can perform functions of billing, OAM (Operation, Administration, Maintenance). The TAS / SCC AS 720 may then provide continuity of the radio resources of the UE 100. For example, during a voice call using LTE or VoLTE, handover can be performed to 3G or 2G so that a voice call is not interrupted in the absence of an LTE network. The SCC AS 740 may roam, for example, a voice call based on VoLTE to a voice call based on 2G or 3G. At this time, the roaming method may be a method of handing over a VoIP call to a Circuit Switched (CS) call.

The MGCF 730 can perform signal conversion for interworking with the PSTN 350, ISUP (ISDN User Part), and CDMA used in the circuit switching network. For example, voice calls coming from 3G via the PSTN 350 can be converted.

The IN AS 740 may be a server performing the same function as the SCP 360. That is, the IN AS 740 may include a database management function that centralizes the entire process of the intelligent network service processing, centralizes the intelligence of the network, and a service control function that has network-level service control logic. In addition, the IN AS 740 can manage network configuration information and subscriber information, and can manage service control logic.

The MGW 750 may be a gateway acting as a connection with the MGCF 730 and performs signaling for interworking with the first network 300 connected to the CSCF 710 and the second network 500 And can convert media.

The HLR 760 may be a central database of the LTE network that holds key information for authentication for each UE 100, subscriber profile, subscriber location information, and the like. At this time, the subscriber profile may include QoS (Quality of Service) class information for each subscriber, for example, priority, maximum available bandwidth, and the like.

The MRF 770 may provide a media source in the IMS network 700. Also, the MRF 700 can manage the call announcement broadcast provided to the UE 100, and can operate as a server for the group call.

An exemplary method for providing call processing integrated call continuity generated in a data network system according to an embodiment of the present invention will be described as follows.

Recently, as the spread of wireless terminals such as smart pads, tablet PCs, and smartphones has increased, wireless terminals using LTE networks have been increasing in order to provide better services than 3G.

In this case, when the SRVCC of the wireless terminal is provided in the IMS network, the call processing must be performed in order of SRVCC, IN AS, and TAS. In the case of constructing a plurality of ASs, the call processing resources of the CSCF are consumed in addition to the cost of building the AS.

Accordingly, the call processing integrated call continuity providing method according to an embodiment of the present invention is implemented as SCC AS / TAS by integrating SCC AS and TAS, and when the SRVCC is provided to the mobile terminal, SCC AS / TAS If the SCC AS / TAS determines that the subscriber of the wireless terminal is an intelligent network subscriber, the MSC rejects the outgoing call of the wireless terminal and triggers the INS to trigger the priority call ).

2 is a block diagram illustrating an apparatus for providing call processing integrated call continuity according to an embodiment of the present invention. Referring to FIG. 2, the call processing integrated communication continuity providing apparatus 900 includes a receiving unit 910, an identifying unit 930, and a transmitting unit 950. 1, the CSCF 710 is defined as a call state management apparatus 700, the MSC 330 is defined as a terminal switching node 330, The SCP 360 is defined as the intelligent network server 360. At this time, the operations of the call state management apparatus 700, the terminal switching node 330 and the intelligent network server 360 may be performed by the CSCF 710, the MSC 330, and the SCP 360, respectively, It will be obvious that it can be driven. In addition, the operation of the call processing integrated call continuity providing apparatus 900 may be performed in the TAS / SCC AS 720, but may be performed in another apparatus.

Returning to FIG. 2, the receiving unit 910 receives a call from the first network 300 to the second network 500 connected to the first network 300 and transmits the outgoing call from the wireless terminal 100 to the first network 300 An invite message based on the handover request may be received via call state management device 700. [

The confirmation unit 930 confirms whether the subscriber using the wireless terminal 100 is an intelligent network subscriber based on the invite message.

The transmitting unit 950 transmits an error response to the invite message of the wireless terminal 100 to the terminal switching node 330 when the subscriber is an intelligent network subscriber. At this time, the error response may be an Orig Trigger Required error response. For example, the error response may be 630 Error and the 630 Error may be Orig Trigger Required Error. In addition, the ORIGIN trigger request causes the terminal switching node 330 to send an invite message to the I-CSCF, and the I-CSCF will send a call to the originating S-CSCF for an origination trigger only if there is an ORIGIN field It may mean requiring a series of operations.

At this time, when receiving an error response from the call processing integrated call continuation providing apparatus 900, the terminal switching node 330 sets an Orig parameter in the route header to change the INVITE message to a call state It can be retransmitted to the management apparatus. When the identification parameter and the PSI (Public Service Identity) are set in the invite message re-received from the terminal switching node 330, the call state management device 710 transmits the outgoing call to the intelligent network server 360, (Orig Trigger). At this time, the identification parameter may be an Orig parameter and the PSI may be STN-SR. Here, the PSI is a condition to be triggered in the I-CSCF, and may be a condition for routing according to a set request URI (Request URI). At this time, if the request URI is STN-SR, the I-CSCF may send the call to the call processing integrated call continuity providing apparatus 900.

In addition, when the INVITE message includes a handover request, the intelligent network server 360 may transmit an exception handling signal to the call state management device 710 so that a duplicate charge for the subscriber is not generated. In this case, the INVITE message including the handover request may be an INVITE message in a form in which the SRVCC is marked.

Each of the structures having the above-described operation will be described as a system.

The terminal switching node 330 transmits a handover request from the first network 300 to the second network 500 from the wireless terminal 100 connected to the first network 300 and transmitting an outgoing call, Lt; / RTI >

The call state management device 710 transmits an invite message based on the handover request received from the terminal switching node 330.

The call processing integrated call continuity providing apparatus 720 checks whether the subscriber using the wireless terminal 100 is an intelligent network subscriber based on the invite message and if the subscriber is an intelligent network subscriber, To the terminal switching node 330. The terminal exchange node 330 transmits an error response to the INVITE message.

When the INVITE message includes a handover request, the intelligent network server 360 transmits an exception handling signal to the call state management device 710 so that a duplicate charge for the subscriber is not generated.

In this manner, the terminal switching node 330, the call status management device 710, the call processing integrated call continuity providing device 720, and the intelligent network server 360 may be configured as one system.

In summary, the terminal switching node 330 first transmits an Invite message for SRVCC session transfer to the call processing integrated call continuity providing apparatus 720. At this time, when the user of the wireless terminal 100 is an intelligent network subscriber, the call processing integrated call continuation providing device 720 transmits an error message including the error message to the terminal switching node 330. In addition, when receiving the error message, the terminal switching node 330 transmits an SRVCC Session Transfer Invite message, but inserts an identifier enabling separate IN network priority processing. The call state management device 710 determines an inserted identifier and transmits an INVITE message. The intelligent network server 360 co-relates the call received before the SRVCC operation with the currently imported INVITE, Do not create duplicate charges. Thus, the invite message via the intelligent network server 360 flows into the TAS / SCC AS 720, and the session transfer invite via the intelligent network server 360, And does not perform the error message again.

The call processing continuity providing method of FIG. 2, which is not described above, can be easily derived from the same or explained contents of the call processing integrated call continuity providing method described above with reference to FIG. .

3 is a diagram illustrating a process in which data is transmitted and received between the respective components included in the data network system of FIG. 1 according to an embodiment of the present invention. Hereinafter, an example of a process in which data is transmitted and received between the respective components will be described with reference to FIG. 3. However, the present invention is not limited to such an embodiment, It is apparent to those skilled in the art that the process of transmitting and receiving data can be changed.

In this case, in FIG. 3, an uppercase O is defined as originating, and an uppercase T is defined as terminating. For example, UE (0) means the calling terminal and UE (T) means the called terminal.

Referring to FIG. 3, when the UE 100 (0) transmits an HD Voice origination call to the E-UTRAN 300 (S3100), the E-UTRAN 300 transmits the HD Voice origination call back to the CSCF 710 (S3200).

The CSCF 710 receiving the outgoing call transmits a signal for creating a session to the IN AS 740 (S3310), and the IN AS 740 transmits a response thereto to the CSCF 710 again. At this time, the CSCF 710 having received the response from the IN AS 740 transmits an invite message to the UE (T) 100 (T) (S3500).

Meanwhile, when the handover request is received from the UE (O) 100 (O) (S3600), the UTRAN 500 transmits the handover request to the MSC 330 (S3610) And transmits a response to the CSCF 710 (S3620). At this time, the CSCF 710 transmits an INVITE message (STN-SR) informing the start of session transfer to the TAS / SCC AS 720 (S3700), and the TAS / SCC AS 720 transmits an SCP call, It is determined whether the call is a subscriber call (S3800).

At this time, if the TAS / SCC AS 720 determines that the call is an SCP call based on the INVITE message based on the handover request of the UE 100 (O), the TAS / SCC AS 720 transmits an error message based on the SCP call to the MSC 330 S3900). When the MSC 330 having received the error message transmits an INVITE message (STN-SR, Orig, SRVCC) to the CSCF 710, the CSCF 710 does not perform PSI routing processing, / TAS Trigger process (S3920, S3930).

Thus, the IN AS 740 sends a signal to the CSCF 710 not to process the duplicate call (S3940) and sends it back to the TAS / SCC AS 720, It is determined that the second session is delivered (S3960). That is, since the TAS / SCC AS 720 sends 630 Error because the user of the UE (O) 100 (O) is the subscriber of the intelligent network, the TAS / SCC AS 720 can not reject the incoming call again. Throughout the iN aS (740) displays the headers haejugo, may not to process it determines that the second session transfer (2 ^nd session transfer) is introduced by this rejection.

 The TAS / SCC AS 720 sends a 200 OK to the MSC 330 (S3970) and transmits the remote leg update to the UE (T) 100 (T) (S3980). At this time, the UE (T) 100 (T) may mean the called terminal but may also mean the called network itself.

Since the method of providing the call processing integrated call continuity of FIG. 3 as described above can be easily deduced from the same or described contents of the call processing integrated call continuity providing method of FIGS. 1 and 2, The description will be omitted.

The order between the above-described steps S3100 to S3980 is only an example, but is not limited thereto. That is, the order between the above-described steps S3100 to S3980 may be mutually varied, and some of the steps may be executed or deleted at the same time.

4 is a flowchart illustrating an operation for providing call processing integrated call continuity according to an exemplary embodiment of the present invention. Referring to FIGS. 2 and 4, a receiving unit receives an invite message based on a handover request from a first network to a second network from a wireless terminal connected to the first network and transmitting an outgoing call, Via the management apparatus (S4100).

Then, the confirmation unit checks whether the subscriber using the wireless terminal is an intelligent network subscriber based on the invite message (S4200).

Then, if the subscriber is an intelligent network subscriber, the transmitting unit transmits an error response to the invite message of the wireless terminal to the terminal switching node (S4300).

4, which is not described in connection with the call processing integrated call continuity providing method, can be easily inferred from the same or described contents of the call processing integrated call continuity providing method through FIGS. 1 to 3 The description will be omitted.

The call processing integrated call continuity providing method according to one embodiment and another embodiment described with reference to FIG. 4 may be performed in the form of a recording medium including instructions executable by a computer such as an application program module executed by a computer Can be implemented. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

A method, apparatus, and system for providing call processing integrated call continuity according to an embodiment of the present invention can be used when providing SRVCC service of VoLTE in a mixed environment of 3GPP LTE network and legacy network. Here, the legacy network may include an environment in which various mobile communication systems such as a Wideband Code Division Multiple Access (WCDMA) mobile communication system, a Global System for Mobile (GSM), and a CDMA 2000 mobile communication system are mixed.

According to an embodiment of the present invention, when providing SRVCC service of VoLTE in a mixed environment of 3GPP LTE network and legacy network, it is possible to minimize network resource allocation due to unnecessary call processing.

Claims (6)

A call processing integrated call continuity providing method executed in a call processing integrated call continuity providing apparatus,
Receiving an invite message based on a handover request from the first network network to the second network network via a call state management apparatus from a wireless terminal connected to the first network and transmitting an outgoing call;
Confirming whether the subscriber using the wireless terminal is an intelligent network subscriber based on the invite message; And
If the subscriber is an IN subscriber, transmitting an error response to the INVITE message of the AT to the AT node
Processing call continuity.
The method according to claim 1,
The terminal switching node,
When receiving the error response from the call processing integrated call continuity providing apparatus, retransmitting the invite message to the call state management apparatus by setting an Orig parameter in a route header,
The call state management apparatus comprises:
Wherein the originating call is Orig Triggered by the intelligent network server when the identification parameter and PSI (Public Service Identity) are set in the invite message re-received from the terminal switch node, Delivery method.
3. The method of claim 2,
Wherein the intelligent network server transmits an exception processing signal to the call state management device so that a duplicate charge for the subscriber is not generated when the handover request is included in the invite message. Way.
The method according to claim 1,
Wherein the error response is an Orig Trigger Required error response.
A receiving unit connected to the first network and receiving an invite message based on a handover request from the first network to the second network via a call state management apparatus from a wireless terminal transmitting an outgoing call;
A confirmation unit for confirming whether the subscriber using the wireless terminal is an intelligent network subscriber based on the invite message; And
If it is determined that the subscriber is an intelligent network subscriber, the mobile terminal transmits an error response to the INVITE message of the AT to the AT
Processing call continuity providing apparatus.
A terminal switching node connected to the first network and receiving a handover request from the first network to the second network from a wireless terminal transmitting an outgoing call;
A call state management device for transmitting an invite message based on a handover request received from the terminal switching node;
And if it is determined that the subscriber using the wireless terminal is an intelligent network subscriber based on the invite message and if the subscriber is an intelligent network subscriber, A call processing integrated call continuity providing device for transmitting to the node; And
And transmitting an exception handling signal to the call state management apparatus so that duplicate charging for the subscriber is not generated when the handover request is included in the invite message,
Processing integrated call continuity providing system.

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