WO2008017190A1

WO2008017190A1 - Method and system for realizing colorful ring back tone service in 3gpp network

Info

Publication number: WO2008017190A1
Application number: PCT/CN2006/001733
Authority: WO
Inventors: Haijun Liu
Original assignee: Zte Corporation
Priority date: 2006-07-18
Filing date: 2006-07-18
Publication date: 2008-02-14
Also published as: CN101491069B; CN101491069A

Abstract

A method and a system for realizing colorful ring back tone (RBT) service in 3GPP network, comprise: the subscribed data about the user of the colorful RBT service is set in HSS OR HLR about the user of the colorful RBT service (S102); the calling terminal makes a call to the user of the colorful RBT service acted as called user, the MSC actives the colorful RBT driving service through the SCP and connects the call to the called terminal (S104); the SCP obtains that the called terminal is in idle state through the MSC and indicates the MSC to establish the voice link to the colorful RBT service center, and the colorful RBT service center begins to play the RBT (S106); the SCP obtains that the state of the called terminal is changed through the MSC and indicates the MSC to disconnect the voice link with the colorful RBT service center, then the voice communication between the calling user and the called user is made or finished (S108). The subscribed data can include service key, address of the SCP, and T-CSI or VT-CSI flag. By adopting the enhanced subscribing method in the present invention, the compatible with the originally service activity is kept and the problem of the voice link promixity is settled.

Description

TECHNICAL FIELD The present invention relates to a color ring back tone service of a wireless communication system, and in particular, to a method for

Method and system for implementing CRBT service in 3GPP network. BACKGROUND OF THE INVENTION A CRBT service (personalized ring back tone service) refers to allowing a caller to listen to a ring tone when the called user is idle. The personalization feature is significant and the hearing experience is obviously enhanced, and the telecom market in China and East Asia is well developed. . At present, the networking of various networks is diversified, and the capabilities of mobile switching centers of various equipment manufacturers are also different. Therefore, the CRBT function needs to be provided in combination with specific networking and mobile switching center capabilities. Among the existing 2G technologies, there are mainly two ways to implement the CRBT service. One is to add the "color ring service" user attribute data in the mobile switching center / HLR (Home Location Register), and the mobile switching center adds the following functions: When the called terminal is idle, the CRBT service is used according to the user's CRBT service data. The center establishes a voice channel for playing the ring tone tone, and transmits the ring tone tone played by the CRBT service center to the calling party. When the state of the called terminal changes to non-idle (such as off-hook, timeout no response, etc.), the mobile switching center is disconnected again. The ring road of the CRBT business center. This method requires the mobile switching center/HLR to make major modifications. It needs to change the user's service data structure and change the call processing flow. At present, there is no relevant standard specification. In actual engineering, the transformation period is long, and there are many equipment manufacturers involved. Caused a long construction period. The other is to use MSC (Mobile Service Switching Center) / HLR service subscription / service trigger (such as in GSM sign About T-CSI, in the CDMA network, the INITIAL- TERMINATION, CALLED-ROUTING-ADDRESS-AVAILABLE trigger, etc.:), set the service contract/business trigger data for the users who need to open the CRBT service, when the call to the called terminal occurs. During the call, the mobile switching center triggers the intelligent network service logic, and the intelligent network service logic instructs the mobile switching center to connect the call to the CRBT service center, and finally the ring back tone service center completes the connected terminal and plays the ring tones. In this way, there is a "spoken path", which not only occupies additional channel relay resources during the call, but also depends on the stability of the CRBT service center. On the other hand, a user can only have one service contract/trigger, and there is also a conflict between the CRBT service and other intelligent network services.

The 3GPP (the 3rd Generation Partnership Project) network's specification standards provide new technologies that can be used to implement value-added services, and therefore require a method for implementing CRBT services for the 3GPP specification standards. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a CRBT service implementation method for a 3GPP network and a system for implementing a CRBT service for a 3GPP network, which maintains compatibility with the original service trigger mode by adopting an enhanced subscription method. Solve the problem of the road back. In order to achieve the above object, according to a first aspect of the present invention, the present invention provides a method for implementing a CRBT service for a 3GPP network. The method for implementing the CRBT service includes the following steps: Step S102: setting subscription data for the CRBT service user on the HSS (Home Subscriber Server) or the HLR of the CRBT service user; In step S104, the calling terminal calls the CRBT service user as the called user, and the MSC triggers the CRBT guiding service through the SCP (Service Control Point) to connect the call to the called terminal. The step S 106 and the SCP are learned by the MSC. The called terminal is in an idle state, instructing the MSC to establish a call to the CRBT service center, and the CRBT service center starts playing the CRBT tone; and in step S108, the SCP learns that the idle state of the called terminal changes through the MSC, and instructs the MSC to disconnect to the CRBT service center. Road, the calling user talks to the called user or the call ends. The subscription data may include a service key, an SCP address, and a contract type flag. If the subscription type is T-CSI (Terminal CAMEL Subscription Information, CAMEL (Customized Applications for Mobile Network Enhanced Logic) subscription information), the BJ MSC can be the originating MSC or GMSC (Gateway). MSC, gateway MSC). In step S104, the step of the MSC triggering the CRBT guiding service on the SCP may include: after the originating MSC or the GMSC obtains the subscription data from the HSS or the HLR, triggering the CRBT guiding service on the SCP; the step of the MSC connecting the called terminal to the called terminal includes: The calling MSC or the GMSC first connects to the roaming MSC of the called terminal, and then connects to the called terminal. In step S106 and step S108, the step of the SCP being informed by the MSC of the status of the called terminal may include: after the MSC receives the message returned by the roaming MSC, the message is sent to the SCP. If the subscription type is VT-CSI (VMSC Terminating CAMEL Subscription Information, the MSCEL subscription information of the visited MSC), the BJ MSC may be the visited MSC. In step S104, the step of the MSC triggering the CRBT guiding service on the SCP may include: the call arrives at the visited place. MSG, the visited MSG triggers the CRBT guiding service on the SCP. In step S106 and step S108, the step of the SCP being informed by the MSC of the status of the called terminal may include: after receiving the message returned by the wireless network, the MSC reports the message to the SCPo in step S106, and after the MSC establishes the call to the CRBT service center, the SCP Instructing the MSC to separate the called end from the call segment 1, and moving the call end to the CRBT service center to the call segment 1, the CRBT service center starts playing the CRBT tone, and the calling user hears the CRBT tone; in step S108, the MSC is disconnected. After the call to the ring back tone service center, the 4 bar called party moves into the call segment 1, the calling user talks with the called party or the call ends, and the CRBT service ends. In step S106, if the MSC does not receive the indication of the SCP, the SCP is determined to release the call according to the SCP no response parameter in the locally defined intelligent network service parameter, or the connection call is continued to the roaming MSC. The CRBT service center may include an intelligent peripheral/service switching point function module, which can process an incoming voice call, and then play the corresponding color ring tone according to the incoming call signaling. In order to achieve the above object, according to a second aspect of the present invention, the present invention provides a system for implementing a CRBT service for a 3GPP network. The system for implementing the CRBT service includes: HSS or HLR, which is used for storing the subscription data of the CRBT service user; MSC, for triggering the CRBT guiding service, receiving and sending the message, establishing and disconnecting the call; SCP, for performing the CRBT guiding The service logic receives the message reported by the MSC, instructs the MSC to connect and establish the call; and the CRBT service center, including the IP/SSP (Intelligent Peripheral/Service Switch Point), and may also include its own SCP device. The CRBT service center is used to play the ring tones. When the calling terminal calls the CRBT service user, the MSC triggers the CRBT guiding service on the SCP, and then connects the call to the called terminal, if the called terminal is idle. Then, the SCP instructs the MSC to establish a call to the CRBT service center, and the CRBT service center starts playing the CRBT tone. If the idle state of the called terminal changes, the SCP instructs the MSC to disconnect the session to the CRBT service center, the calling user and the called user. The call or call ends. The subscription data may include a service key, an SCP address, and a contract type flag. If the subscription type is T-CSI, the MSC may be the originating MSC or the GMSC. If the subscription type is VT-CSI, the MSC may be the visited MSC.

The agreement between the SCP and the MSC can be CAP4. The ten-handed agreement between the HSS or HLR and the MSC can be MAP (Mobile Application Part). The IP/SSP and the MSC may include a signaling connection No. 7 and a voice trunk connection. Through the above technical solutions, the present invention achieves the following technical effects. The method for realizing the CRBT service proposed by the present invention effectively functions as a 3GPP CAP (CAMEL Application Part, CAMEL Application) protocol, and does not require any tampering of MSC, GMSC, and SCP 4. Through the above method, the CRBT service can be realized through the development of the intelligent network software conforming to the standard, and a simple and easy method for opening the CRBT service in the CS (Circuit Switching) domain of the 3GPP network is provided. At the same time, the call between the master and the called party, the call does not pass through the color ring service center, and the words are avoided. The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the invention and the description thereof are intended to be illustrative of the invention and are not intended to limit the invention. In the drawings: FIG. 1 is a flowchart of a method for implementing a color ring service according to the present invention; 2 is a networking diagram of a 3GPP communication system according to an embodiment of the present invention; and FIG. 3 is a schematic diagram of a signaling flow according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. Referring to FIG. 1 , a method for implementing a CRBT service for a 3GPP network according to the present invention includes the following steps: Step S102: Set subscription data for a CRBT service user on an HSS or HLR of a CRBT service user, where the subscription data may include a service key, The SCP address and the subscription type identifier, the subscription type may be T-CSI or VT-CSi; Step S104, the calling terminal calls as the CRBT service user of the called user, and the MSC triggers the CRBT guiding service on the SCP, and according to the SCP Instructing the connected call to the called terminal; Step S106, the SCP learns that the called terminal is in an idle state by the MSC, instructs the MSC to establish a call to the CRBT service center, and the CRBT service center starts playing the CRBT tone; and in step S108, the SCP learns through the MSC. The idle state of the called terminal changes, indicating that the MSC disconnects the voice channel to the CRBT service center, and the calling user talks with the called user or the call ends. The technical problem to be solved by the present invention is that the CRBT service is implemented in the contract mode of the 3GPP network, and the CRBT service is easily opened in the CS domain of the 3GPP network, and there is no voice path bypass. 2 is a schematic diagram of a network for implementing a CRBT service in a CS domain of a 3GPP network, indicating the device device of the present invention: an intelligent network service control point device SCP, a CRBT (Color Ring Back Tone) (including IP/SSP, possibly Including SCP), MSC Server or GMSC, HSS, wireless network, No. 7 signaling network and so on. In Figure 2, the SCP and CRBT service center can be a combined device on the hardware (SCP), and the device is shown in the figure. Unless otherwise stated, the SCP refers to the SCP that triggers the intelligent network service-color ring tone guiding service, rather than the SCP used to control IP playback in the CRBT service center. The connection between the SCP and the IP/SSP of the CRBT service center is used to transmit service trigger information and indicate the playback of voice information. The ten-to-one agreement between the two is INAP (Intelligent Network Application Part). The connection between the SCP and the ViSC Server/GMSC is used to transmit service trigger information, instruct the MSC Server/GMSC to connect to the call, establish a call, etc., and the ten-to-none agreement between the two is CAP4. The connection between MSC Server/GMSC and IP/SSP has No. 7 signaling. In the case of GMSC, there is also a voice trunk connection between IP and SSP. In the case of MSC Server, MGW (Media Gateway, Media Gateway) and There is a voice trunk connection between the IP/SSP. An important function of the voice relay here is to carry voice. The service subscription data of the service user is stored on the HSS/HLR, and the interface protocol with the MSC Server/GMSC is MAP. In the present invention, a set of service modules is loaded on the SCP: a color ring tone guiding service, and the service module complies with the CAP4 specification, and is used for establishing a ring tone voice channel to the color ring tone service center in addition to the connection call, so that the color ring tone service center plays The ring tone is given to the calling user. In order to solve the above technical problem, the present invention provides a method for implementing a CRBT service in a 3GPP network, including the following steps: Step 1: For the CRBT user, sign the CRBT service for the CRBT on the home location register, and the subscription data includes the service key, SCP address, T-CSI or VT-CSI flag; Step 3⁄4! 2. The calling party dials the CRBT user. When the T-CSI is signed, the originating mobile switching center MSC (or GMSC) triggers the CRBT guiding service on the SCP after obtaining the service subscription data from the HLR. The MSC or the GMSC first connects the call to the roaming MSC of the called terminal; when signing the VT-CSI, the call arrives at the visited MSC, and the visited MSC triggers the CRBT guiding service on the SCP, according to the CRBT guiding service indication, the visited place The MSC is connected to the called terminal. Step 3: In the case of signing the T-CSI, the originating MSC or the GMSC, after receiving the message returned by the roaming MSC indicating that the called terminal is in an idle state, reports the message to the SCP, and the ring back tone on the SCP is guided. The service indicates that the MSC or the GMSC establishes the voice call to the IP/SSP (in the CRBT service center), and after the connection, the CRBT guiding service on the SCP indicates that the originating MSC or the GMSC separates the called party from the call segment 1, and The IP/SSP caller moves to the call segment 1 and the CRBT service center starts to play the CRBT tone; at this time, the caller hears the CRBT tone; when signing the VT-CSI situation, the visited MSC receives the return from the wireless network. After the message indicating that the called terminal is in the idle state, the uplink message is sent to the SCP, and the CRBT guiding service on the SCP indicates that the visited MSC establishes the voice call to the IP/SSP (in the CRBT service center), and the ring back tone on the SCP after the connection. The guiding service instructs the visited MSC to separate the called end from the calling segment 1, and moves the calling end to the IP/SSP to the calling segment 1, and the CRBT service center starts to play the ring tones; at this time, the calling party hears the ring tones; Step 4: After the MSC or the GMSC receives the message indicating that the called terminal is in an idle state, the MSC or the GMSC returns a message to the SCP, and the SCP The CRBT guiding service indicates that the originating MSC or the GMSC disconnects the voice channel to the CRBT service center, and the 4 bar called party moves into the call segment 1, the calling party is called or the call ends, and the CRBT service ends; the VT-CSI is signed. after time, the MSC receives the visited wireless network indicating that the called terminal returns to the idle state change message, the ^{^:} Gen message to the SCP, the ring back tone SCP guide traffic indication visited MSC CRBT service center to disconnect the speech path, And the called party is moved to the call segment 1, the calling party is called or the call is over, and the ring back tone service ends. Further, the foregoing method may also have the following features: When signing a CRBT guiding service on the HLR, it may be a T-CSI signing or a VT-CSI signing, and may select a signing type that does not conflict with other intelligent network services. Further, the foregoing method may further have the following features: Step 3: If the originating MSC or the GMSC, or the visited MSC does not receive the indication of the SCP, the service control point is not responded according to the locally defined intelligent network service parameter of the user. "To decide to release the call, or continue to connect to the 'roaming MSC.' Further, the foregoing method may further have the following features: The CRBT service center includes an intelligent peripheral/service switching point function, which can process an incoming voice call, that is, the corresponding color ring tone is played according to the incoming call signaling. It can be seen from the above that the method for realizing the CRBT service proposed by the present invention effectively functions as the 3GPP CAJP protocol, without any modification of the MSC and the GMSC. Through the above method, the CRBT service can be realized through the development of the intelligent network software conforming to the standard, and a simple and easy method for opening the CRBT service in the CS domain of the 3GPP network is provided. At the same time, the call connection between the master and the called party does not pass through the ring back tone service center, which avoids the call back. FIG. 3 shows a signaling flow of a ring tone process played by the CRBT service center in this embodiment. Step 10: The calling party dials the called telephone, and the call requesting the IAM message arrives at the MSC Server or the GMSC, or the visited MSC, the MSC Server or the GMSC:, or the visited MSC starts to start the called procedure. If the user subscribes to the T-CSI, then The MSC Server or the GMSC sends an SRI message to the HLR to request the called user data. If the user subscribes to the VT-CSI situation, the process goes to step 30. Step 20: The HLR responds to the SRI_ACK message, where the message includes the service subscription data of the called user, such as The subscription type (T-CSI), the service key, and the SCP address; Step 30, the MSC Server or the GMSC, or the visited MSC sends an IDP message to the intelligent network SCP according to the service subscription data of the called user, and triggers the intelligent network service on the SCP. Step 40: The intelligent network service on the intelligent network SCP-the CRBT guiding service remote is triggered, and the service sequence sends an RRBE message to the MSC Server or the GMSC, or the visited MSC, and the registered DP includes at least OJTerm-Seized, T-Ask, The corresponding leg is 2. Step 50: The SCP sends a CONTINUE message to the MSC Server or the GMSC, or the visited MSC, instructing the MSC Server or the GMSC, or the visited MSC to connect to the called terminal. Step 60: If the user signs the T-CSI, the MSC Server or the GMSC sends the message. The SRI message is sent to the HLR to request the roaming number of the called terminal, and the SRI request message indicates the HLR ^^P system T-CSI; if the user subscribes to the VT-CSI situation, the visited MSC connects the called terminal through the wireless network, and proceeds to step 90; Step 70: The HL responds to the SRI_ACK message, where the message includes the roaming number MSRN of the called terminal. Step 80: The MSC Server or the GMSC uses the roaming number of the called terminal to connect to the called terminal: sending the called number to the IAM of the roaming number to Roaming the MSC; Step 90, the called terminal rings, the MSC Server or the GMSC, or the visited MSC receives the ringing indication signal of the called terminal, and reports the ERB message to the SCP, where the DP is 0_Term_Servized and the leg is 2; 100. The SCP sends an ICA (Initaite Call Attempt) message to the MSC Server or the GMSC, or the visited MSC. The called number in the ICA message includes the number of the CRBT service center. For example, the called number is: CRBT service center number (prefix) + called user number, the called party's assigned legID is 3; Step 110, the MSC Server or the GMSC, or the visited MSC is ready to establish a new call in the current CSA (Call Segment Association), The SCP responds to the ICA_ACK. Step 120: The SCP sends an RRBE message to the MSC Server or the GMSC, or the visited MSC. The registered DP includes at least O_Answer, and the corresponding leg is 3; Step 130, SCP to MSC The Server or GMSC, or the visited MSC sends a CWA (Continuation with Argument) message, the leg parameter in the message is 3; Step 140, the MSC Server or the GMSC, or the visited MSC establishes a new call: Send an IAM message to CRBT Business Center (IP/SSP); Step 150: The CRBT service center responds to the ACM message to the MSC Server or the GMSC, or visits the MSC. Step 160, the CRBT service center sends an ANM message to the MSC Server or the GMSC, or visits the MSC; Step 170, MSC Server or GMSC, or visit The MSC sends an ERB message to the SCP, where DP is 〇_Answer and leg is 3; Step 180, the SCP sends a SplitLeg message to the MSC Server or the GMSC, or the visited MSC, leg is 2; Step 190, SCP to MSC Server Or the GMSC, or the visited MSC sends a MoveLeg message, and the leg is 3; in step 200, the CRBT service center plays the CRBT tone, and the calling party calls the CRBT tone; Step 210, the MSC Server or the GMSC, or the visited MSC uploads the ERB to the SCP. In the message, the DP is O_answer, leg is 2; Step 220, the SCP sends a DisconnectLeg message to the MSC Server or the GMSC, or the visited MSC, and the leg is 3; Step 230, the MSC Server or the GMSC, or the visited MSC releases the call. : Sending a REL message to the CRBT service center (IP/SSP); Step 240, the CRBT service primary responds to the RLC message to the MSC Server or the GMSC, or the visited MSC; Step 250, the SCP sends the MSC Server or the GMSC, or the visited MSC MoveLeg message, l Eg is 2; Step 260: The MSG Server or the GMSC, or the visited MSC connects to the calling and called channels, and the calling party and the called party call, and the CRBT service ends.

The specification standards of the 3GPP network provide new technologies for implementing services and adopt enhanced contracting methods, which not only maintain compatibility with the original service triggering method, but also solve the problem of voice path roundabout. The present invention implements the CRBT service using the techniques in the 3GPP specification standard. In the above embodiment, the switched network scenario is applicable to the 3GPP network CS domain. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for implementing a CRBT service for a 3GPP network, comprising the following steps: Step S102, setting a user for the CRBT service on a home service subscriber server or a home location register of a CRBT service user Signing data;

Step S104, the calling terminal calls the CRBT service user as the called user, and the mobile switching center triggers the CRBT guiding service through the service control point, and connects the call to the called terminal; Step S106, the service control point passes the mobile The switching center learns that the called terminal is in an idle state, instructing the mobile switching center to establish a call to the CRBT service center, the CRBT service center starts playing the CRBT tone; and step S108, the service control point passes the mobile The switching center learns that the idle state of the called terminal changes, instructing the mobile switching center to disconnect the voice channel to the CRBT service center, and the calling user talks with the called user or the call ends.

The method for implementing a CRBT service according to claim 1, wherein the subscription data comprises a service key, a service control point address, and a subscription type identifier.

The method for implementing a CRBT service according to claim 1, wherein if the subscription type is T-CSI, the mobile switching center is an originating mobile switching center or a gateway mobile switching center.

The method for implementing a CRBT service according to claim 1, wherein if the subscription type is VT-CSI, the mobile switching center is a visited place. Mobile switching center. The method for implementing the CRBT service according to claim 3, wherein in step S104, the step of the mobile switching center triggering the CRBT guiding service through the service control point comprises: the originating mobile switching center or the gateway mobile switching center After the home service user server or the home location register obtains the subscription data, triggering the CRBT guiding service on the service control point; the step of the mobile switching center connecting the called terminal to the called terminal includes the initial call mobile switching center Or the gateway mobile switching center first connects to the roaming mobile switching center of the called user, and then connects to the called terminal. The method for implementing the CRBT service according to claim 4, wherein, in step S104, the step of the mobile switching center triggering the CRBT guiding service by using the service control point comprises: the calling arrives at the visited mobile switching center, The visited mobile switching center triggers the CRBT guiding service on the service control point. The method for implementing the CRBT service according to claim 3, wherein in step S106 and step S108, the step of the service control point learning the status of the called terminal through the mobile switching center comprises: the mobile switching After receiving the message returned by the roaming mobile switching center, the center reports the message to the service control point. The method for implementing the CRBT service according to claim 4, wherein in step S106 and step S108, the step of the service control point learning the status of the called terminal through the mobile switching center comprises: the mobile switching After receiving the message returned by the wireless network, the center sends a message to the service control point.

The method for implementing the CRBT service according to claim 1, wherein, in step S106, after the mobile switching center establishes a call to the CRBT service center, the service control point indicates that the mobile switching center is from the call segment 1 Separating the called end, and moving the call end to the CRBT service center to the call segment 1, the CRBT service center starts to insert and play the CRBT, and the calling user hears the CRBT tone; in step S108, After the mobile switching center disconnects the voice channel to the CRBT service center, the called end is moved to the call segment 1, and the calling user talks with the called user or the call ends, and the CRBT service ends.

The method for implementing the CRBT service according to claim 1, wherein, in step S106, if the mobile switching center does not receive the indication of the service control point, the called user is locally defined according to the method. The service control point in the intelligent network service parameter has no response parameter to decide to release the call, or to continue the connection to the roaming mobile switching center.

The method for implementing a CRBT service according to claim 1, wherein the CRBT service center includes an intelligent peripheral/service switching point function module, which is capable of processing an incoming voice call, and plays a corresponding color ring tone according to the incoming call signaling. sound.

12. A system for implementing a CRBT service for a 3GPP network, comprising:

a home service user server or a home location register for storing subscription data of a CRBT service user; a mobile switching center, configured to trigger a CRBT guiding service, receiving and sending a message, establishing and disconnecting a call; and a service control point for performing The CRBT guides the service logic, and receives a message reported by the mobile switching center, indicating that the mobile switching center is connected and Establishing a call; and a CRBT service center, including an IP/SSP, where the CRBT service center is used to play a CRBT, where

When the calling terminal calls the CRBT service user, the mobile switching center triggers the CRBT guiding service on the service control point, and connects the call to the called terminal. If the called terminal is in an idle state, the service control point Instructing the mobile switching center to establish a call to the CRBT service center, the CRBT service center starts playing a CRBT tone, and if the idle state of the called terminal changes, the service control point indicates that the mobile switching center is off. Opening the call to the CRBT service center, the calling user talks to the called user or the call ends.

13. The system of claim 12, wherein the subscription data comprises a service key, a service control point address, and a subscription type flag.

The system according to claim 12 or 13, wherein if the subscription type is T-CSI, the mobile switching center is an originating mobile switching center or a gateway mobile switching center.

The system according to claim 12 or 13, wherein if the subscription type is VT-CSI, the mobile switching center moves the handover center for the visit.

16. The system according to claim 12, wherein the i" between the service control point and the mobile switching center is CAP4.

The system according to claim 12, wherein the protocol between the home service subscriber or the home location register and the mobile switching center is a MAP.

The system according to claim 12, wherein the IP/SSP and the mobile switching center include a signaling connection No. 7 and a voice trunk connection.