KR101117440B1 - A Device And Method For Providing Free Number Service in the IP Multimedia Subsystem - Google Patents
A Device And Method For Providing Free Number Service in the IP Multimedia Subsystem Download PDFInfo
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- KR101117440B1 KR101117440B1 KR1020080082446A KR20080082446A KR101117440B1 KR 101117440 B1 KR101117440 B1 KR 101117440B1 KR 1020080082446 A KR1020080082446 A KR 1020080082446A KR 20080082446 A KR20080082446 A KR 20080082446A KR 101117440 B1 KR101117440 B1 KR 101117440B1
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Abstract
A method for providing a virtual number service based on an IMS network according to the present invention comprises adding a real number corresponding to the virtual number to a message body field of a SIP message whose virtual number is a called number, Call processing based on the actual number is performed by generating trigger information for access in the message header field.
Virtual number, IMS, SIP message
Description
The present invention relates to a virtual number service in an IP multimedia subsystem (IMS). More specifically, the present invention relates to a virtual number using an extension function of a Session Description Protocol (SDP) parameter of a Session Initiation Protocol (SIP) message. A method and apparatus for providing a service are provided.
As mobile communication technology develops and mobile communication network evolves, the 3rd generation mobile communication system (IMT-2000) essentially provides Internet services, and has a unique Internet Protocol (IP) address assigned by an Internet service provider (ISP). With the IMT-2000 network, it provides mobile IP that can receive internet service. The adoption of IP-based Internet protocols in mobile networks has been accepted as a gradual trend, and Internet protocols are becoming a part of mobile network technologies. The European-led 3GPP (3rd Generation Project Partnership) and the North American-led 3GPP2, which proceeds with the standard of IMT-2000, do not stay here and take the notion of 'ALL IP NETWORK', which replaces all infrastructures of mobile communication with IP. Introduced, ALL IP network is a next-generation mobile communication network that is included in the category of IMT-2000 network but has a completely different infrastructure.
The biggest feature of ALL IP network is that it is the first 3GPP network to support IP multimedia service. This feature is specifically implemented by newly added nodes to support IP multimedia services, collectively called the Internet Protocol Multimedia Subsystem (IMS).
That is, IMS is a set of nodes newly introduced to provide an IP multimedia service, and includes a call session control function (CSCF), a home subscriber server (HSS) and an application server (AS). And the like.
1 is a block diagram schematically illustrating a typical IMS service network.
Referring to FIG. 1, the IMS service network stores user equipment (UE) 10 and all data on subscriber data, and manages user profiles and information management functions and authorities for UE mobility management. Call session controller (CSCF) for performing multimedia call control based on Session Initiation Protocol (SIP) and HSS (Home Subscriber Server) 25 that performs functions such as authentication (Authorization) Control functions (21), 22, and 23, and an application server (AS) 30 for providing various IMS services.
The
The call session controller (CSCF) performs an incoming call gateway, call control, serving profile management, and address processing. Specifically, the CSCF uses a proxy-call session control function (P-CSCF) 23, an interrogating-call session control function (I-CSCF) 22, and a serving-call session control function (S-CSCF) 21. Have
The P-CSCF 23 serves as a proxy and a user agent. The P-CSCF 23 is the first point point at which the user terminal (UE) 10 connects to the
The I-CSCF 22 is the first point of the user terminal (UE) 10 accesses the home network, and a plurality of I-
The S-CSCF 21 serves as a register and controls a session of a registered endpoint. The S-CSCF 21 is registered in the HSS 25 so as to correspond to the user terminal (UE) 10, and then downloads and stores subscriber information of the user terminal (UE) 10. In addition, the S-CSCF 21 performs a control service while managing session state of an actually registered user terminal (UE) 10. The S-CSCF 21 provides information related to service resources to the user terminal (UE) 10. In addition, the S-CSCF 21 performs authentication with the authentication information received from the
On the other hand, the HSS 25 is responsible for all the information of the UE (UE) subscriber for call / session control. This includes all the functions of the home location register (HLR) in the existing 3G network, and also includes the signaling protocol related to the information about the IMS subscriber. One or several
The HSS 25 is a subscriber's master database with basic information related to the subscriber. Such information includes subscriber identifier (ie number and address information), subscriber security information (ie network access control information for authentication and authorization verification), subscriber location information (ie registration and inter-system level mobility information). ) And subscriber profile information.
Based on the above information, the
When there are a plurality of
The application server (AS) 30 includes Instant Messaging (IM), Presence (Voice), Voice Call Continuity (VCC), Push-To-Talk (PTT), Voice over Internet Protocol (VoIP), Group List Management (GLMS) Network element for providing subscribers with IP multimedia services including Server), IMS Centralized Services (ICS), and virtual number services.
The user registers with IMS using the prescribed SIP REGISTER method. This is a mechanism for notifying the IMS of addresses belonging to the IMS and from which SIP user identification can be reached. In 3GPP, when an IMS terminal (or SIP terminal) performs registration, the IMS authenticates the user and assigns the S-CSCF to the user from the set of available S-CSCFs. While the criteria for allocating S-CSCF are not defined by 3GPP, they may include load sharing and service requirements. It should be noted that the assignment of S-CSCF is a key factor in controlling user access to IMS-based services.
During the registration process, the I-CSCF is responsible for selecting an S-CSCF if it has not already been selected. The I-CSCF receives the required S-CSCF capability from the home subscriber server (HSS) of the home network and selects an appropriate S-CSCF based on the received capability. When a registered user continues to send a session request to the IMS, the P-CSCF may forward the request to the selected S-CSCF based on the information received from the S-CSCF during the registration procedure. In an IMS service network, application servers (ASs) are provided to implement IMS service functionality. The application server provides the service to the end user in the IMS system and can be connected as an end point via the 3GPP-compliant Mr interface or "linked" by the S-CSCF via the 3GPP-compliant ISC interface. In the latter case, the Initiation Filter Criterion (IFC) is used by the S-CSCF to determine which application server should be "linked" during SIP session establishment. The IFC is received by the S-CSCF from the HSS during the IMS registration procedure as part of the subscriber profile (see Figure 4).
Free Number means a virtual telephone number used instead of a real telephone number to protect his privacy. A voice call processing technology for implementing such a virtual number service is disclosed in Korean Patent No. 0795585 (Patent Document 1) and Korean Patent No. 0800083.
This virtual number service is applicable not only in voice call processing but also in multimedia call processing, in particular, multimedia service using IP multimedia subsystem.
The procedure for providing virtual number service in IMS network is as follows. That is, the calling CSCF receiving the SIP message from the subscriber checks the IFC of the subscriber profile and routes the SIP message to a predetermined application server. The application server changes the virtual number of the "TO" tag in the message header field of the SIP message to a real number and returns it to the calling CSCF.
In this case, the following problem occurs due to the charging generation characteristics of the IMS network.
The charging condition of each network element in the IMS generates one CDR based on the "Call-ID" tag, the "TO" tag, and the "FROM" tag of the SIP message. That is, when both the "Call-ID" tag, the "TO" tag, and the "FROM" tag match before and after the message is transmitted, one CDR is determined as one call processing and the one "Call-ID" is generated. If any one of the " tag, " TO " tag and " FROM " tag is changed, another call processing is judged to generate another new CDR.
Therefore, when the virtual number of the "TO" tag in the message header field is changed to the real number in the application server as in the conventional IMS virtual number service, the CDR based on the virtual number and the CDR based on the real number are duplicated. There is a problem that the charge is duplicated for one service.
Therefore, in implementing the virtual number service in the IMS network, a new call processing scheme is required that does not cause the problem of duplicate charging as in the prior art.
The inventors have found that the reason for the duplicate charging in the conventional virtual number service is that the application server changes the "TO" tag information in the message header field.
In addition, the present inventors have found that specific SDP parameters of SIP messages can be extended according to a subscriber's use, and when using these scalable parameters, it is possible to provide a virtual number service without changing "TO" tag information.
Accordingly, an object of the present invention is to prevent a problem of duplicate charging when providing a virtual number service in an IMS network.
It is another object of the present invention to extend a function of a specific SDP parameter of a SIP message so that call processing to an actual number can be performed without changing a specific parameter of a message header field.
Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Further, objects and advantages of the present invention can be realized by the means and the combination shown in the appended claims.
An application server for providing a virtual number service based on an IMS network according to the first aspect of the present invention, comprising: means for receiving a first SIP message having a virtual number as a called number from a calling party session controller (CSCF); ; Means for adding a real number corresponding to the virtual number to a message body field of the first SIP message; Means for generating trigger information in a message header field of the SIP message to access the actual number; Means for generating a second SIP message comprising the trigger information and a real number; And means for transmitting the second SIP message to the originating call session controller.
Further, a call session control apparatus located in an originating IMS core network according to a second aspect of the present invention, includes: first receiving means for receiving a first SIP message having a virtual number as a called number from an originating subscriber; First routing means for routing the first SIP message to an application server providing a virtual number service according to trigger information of an Initial Filter Criteria (IFC) of a subscriber profile; Second receiving means for receiving from the application server a second SIP message including a real number corresponding to the virtual number in a message body field; And second routing means for identifying a real number from the second SIP message and routing the second SIP message to a called party call session controller that is in charge of the real number. In this case, the real number is added using the SDP parameter of the message body field of the second SIP message, and the trigger information for accessing the real number is included in the message header field of the second SIP message. The second routing means checks the actual number according to the trigger information.
The second routing means obtains a routing path to the called party session controller by querying a home subscriber server (HSS) using the actual number, and the first routing means obtains the IFC of the subscriber profile. It checks whether the called subscriber subscribes to the virtual number service, and routes the first SIP message to the application server before the call processing according to the virtual number according to trigger information of the IFC.
A method for providing a virtual number service based on an IMS network according to a third aspect of the present invention comprises: adding a real number corresponding to the virtual number to a message body field of a SIP message whose virtual number is a called number; By generating trigger information for accessing the actual number in the message header field, call processing based on the actual number is performed.
According to a fourth aspect of the present invention, there is provided a method of processing a SIP message using a virtual number as a called number in an originating IMS network, the method comprising: receiving a first SIP message using a virtual number as a called number from an originating subscriber; Generating a second SIP message by adding a real number corresponding to the virtual number to a message body field of the first SIP message and generating trigger information for accessing the real number in a message header field; Confirming the actual number according to trigger information of the second SIP message; And processing the second SIP message to the called party's network node using this actual number as the called number.
A method for providing a virtual number service based on an IMS network according to a fifth aspect of the present invention, the method comprising: receiving, at an originating network node, a first SIP message having a virtual number as a called number from an originating subscriber; Routing the first SIP message to an application server for providing a virtual number service according to trigger information of an Initial Filter Criteria (IFC) of a subscriber profile before an incoming call processing; At the application server, add a real number corresponding to the virtual number to the first SIP message using an extensible Session Description Protocol (SDP) parameter of a message body field of a SIP message and trigger to access this real number Generating a second SIP message by generating information in a message header field of the first SIP message and transmitting it to the originating network node; And identifying, at the calling network node, the actual number according to the trigger information of the second SIP message, and processing the second SIP message by using the actual number as a called number.
Further, the method according to the fifth aspect of the present invention includes: receiving, at a called network node, the second SIP message from the calling network node; And converting the SIP-URI of the start line field of the second SIP message by using the IP for the actual number.
The first and second SIP messages are SIP INVITE messages, and a virtual number is linked to a To tag of a message header field of the first and second SIP messages.
According to the present invention, in providing a virtual number service through an IMS network, since the existing tag information (CALL-ID, TO, FROM) of the message header field of the SIP message is not changed, billing information is duplicated. You can prevent it.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, FIG. 2 is a block diagram of an IMS network system for implementing a virtual number service according to a preferred embodiment of the present invention.
The IMS network system according to FIG. 2 is largely composed of a calling party
The source
After the calling party S-
Upon receipt of the response message from the
The called party S-
Hereinafter, a detailed configuration of IMS network elements for implementing a virtual number service according to the present invention will be described with reference to FIG. 2.
First, the calling party S-
As the SIP module receives the SIP message from the calling subscriber, the
When the called subscriber is subscribed to the virtual number service, the triggering
4 shows a schematic configuration of a subscriber profile. The portion of the
That is, the
The real
The
First, the
Before describing the trigger
As shown in FIG. 5, the
The
The
The
The real
In addition, the trigger
The SIP message newly generated by the real
In addition, the receiving side S-
The
The
A virtual number service providing method of the present invention based on the system having the above configuration will be described with reference to FIGS. 3 and 6.
The calling subscriber
The calling party S-
The calling party S-
Accordingly, the application server AS transmits 100 attempt responses to the calling party S-
The application server receiving the SIP INVITE message (2) 600 such as (a) of FIG. 6 from the calling party S-
The SIP INVITE message (3) thus generated is sent back to the calling party S-
The originating S-
The calling party S-
Thereafter, the calling party S-
The called party S-
The
As such, the virtual number service according to the present invention does not cause the problem of the conventional billing because it enables the message routing according to the actual number without changing the virtual number of the "TO" tag of the SIP message.
In the above described with reference to the accompanying drawings, preferred embodiments of the present invention in detail. However, embodiments of the present invention can be variously modified or applied by those skilled in the art, the scope of the technical idea according to the invention to be defined by the claims to be described later will be.
The following drawings, which are attached to this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.
1 is a block diagram of an IP multimedia subsystem.
2 is a block diagram of an IP multimedia subsystem for providing a virtual number service according to the present invention;
3 is a call processing flow diagram for implementing a virtual number service in accordance with the present invention.
4 is a schematic data format of a subscriber profile.
5 is a message format of a SIP message.
6 is a message format conversion diagram of an INVITE message according to the call processing flow of FIG.
Claims (22)
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KR1020080082446A KR101117440B1 (en) | 2008-08-22 | 2008-08-22 | A Device And Method For Providing Free Number Service in the IP Multimedia Subsystem |
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JP2008167454A (en) | 2002-10-09 | 2008-07-17 | Nokia Corp | Method and system for concealing true identity of user in communication system |
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