KR100821186B1 - Method for processing call by call session controlling device in ims network and the call session controlling device thereof - Google Patents

Abstract

A method for processing a call by a call session control device of an IMS(IP Multimedia Subsystem) network and the call session control device thereof are provided to determine construction of an ENUM(E.164 Number Mapping) server according to a request of a network provider, and to determine whether to construct the ENUM server according to environment of a corresponding network in order to improve the efficiency of call processing. A communication unit receives a call request including receiving number information from a sending terminal. A number translator(510) decides whether an ENUM server exists in an IMS network, and if not, the translator recognizes an IP(Internet Protocol) address of a receiving-side call session control device by using prefix information of a receiving number included in the receiving number information. A call processor(550) sets a call between the sending terminal and a receiving terminal equivalent to the receiving number by demanding a call to the receiving-side call session control device with the use of the IP address.

Description

Method for processing a call session control device in an IMS network and its call session control device {Method for processing call by call session controlling device in IMS network and the call session controlling device about}

1 is a schematic diagram showing an overall system for processing a call in an IMS network according to an embodiment of the present invention.

2 is a flowchart illustrating a call processing process in a general IMS network.

3 is a flowchart illustrating a call processing process in an IMS network according to an embodiment of the present invention.

4 is an exemplary diagram illustrating an INVITE Session Initiation Protocol (SIP) message transmitted from an originating terminal according to an embodiment of the present invention.

5 is a functional block diagram of a call session control device (CSCF) of the IMS network according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: calling terminal

30: called terminal

50: Call Session Control Function (CSCF)

52: P-CSCF

54: I-CSCF

56: S-CSCF

70: Home Subscriber Server

100: IMS (IP Multimedia Subsystem) Network

The present invention relates to call processing, and more particularly, to a method for call processing by a call session control apparatus of an IP Multimedia Subsystem (IMS) network and a call session control apparatus thereof.

Recently, there are not only circuit switching based communication networks such as CDMA (Code Division Multiple Access) networks, but also packet switching based communication networks, especially IP based communication. IMS network is used.

The IMS network is configured to use a URL based on a network access identifier (NAI) -based SIP / TEL Uniform Resource Locator (URL) (eg, TEST@KTF.COM).

Call Session Control Function (CSCF) that performs the function of call session control device of IMS network when it comes up to TEL URL from originating terminal inquires ENUM (E.164 Number Mapping) server and acquires called party number. A call with a called terminal is set. Here, it is a URL using a telephone number as a TEL (telephone) URL, for example, as shown in FIG. 3, it is as "tel: 01030101804".

However, in the case of the communication network where the ENUM server does not exist, the called number according to the TEL URL cannot be obtained, and the corresponding CSCF cannot perform call processing.

Accordingly, an object of the present invention is to provide a method and apparatus for processing a call in an IMS network that can be processed without an ENUM server.

Other objects of the present invention will become more apparent through the preferred embodiments described below.

According to an aspect of the present invention for achieving the above object, in the call processing method in the call session control apparatus of the IMS network using a TEL URL, receiving a call request including the called party information from the originating terminal ; Recognizing an IP address of a corresponding called party session control device using the prefix information of the called party; And setting up a call between the calling terminal and the called terminal corresponding to the called number by requesting a call to the called party session control device using the IP address. There is provided a recording medium on which a program to be executed is recorded.

The receiving of the call request may include recognizing that there is no associated ENUM server (E.164 Number Mapping).

In addition, the call session control device may be a call session control function (CSCF).

According to another aspect of the present invention for achieving the above object, an apparatus for controlling a call session of an IMS network using SIP, the apparatus comprising: a communication unit for receiving a call request including called party information from an originating terminal; A number translation unit that recognizes an IP address of a corresponding called party session control device using prefix information of the called party; And a call processing unit configured to establish a call between the originating terminal and the called terminal corresponding to the called number by requesting a call to the called party session control device using the IP address. .

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

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.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in the following description with reference to the accompanying drawings, redundant descriptions of the same or corresponding components regardless of reference numerals will be omitted. do.

1 is a schematic diagram showing an overall system for processing a call in an IMS network according to an embodiment of the present invention.

Referring to FIG. 1, the IMS network 100 is a communication network based on a communication network standard proposed by the 3rd Generation Partnership Project (3GPP), and provides an IP-based communication service, and mainly uses a signaling protocol such as a Session Initiation Protocol (SIP). do. The IMS network 100 according to the present embodiment may be used as an auxiliary network of a mobile communication network such as a wide-band code division multiple access (WCDMA) network, which will be apparent to those skilled in the art.

The IMS network 100 includes a call session control device 50 and a home subscriber server (HSS) 70 for session control. As shown in the figure, the call session control device 50 of the IMS network 100 may be a Call Session Control Function (CSCF). Of course, it will be more apparent from the following description that not only the CSCF but also all devices controlling the call session can be implemented equally as the call session control device. Hereinafter, the call session control device 50 will be described as an example that the CSCF. The CSCF 50 registers the subscribed mobile terminal with the HSS 70 and routes the SIP signaling to the appropriate server.

As shown in the figure, the CSCF 50 may include a Proxy CSCF 52 (P-CSCF), a Serving CSCF 54 (S-CSCF), and an Interrogating CSCF 56 (I-CSCF). The P-CSCF 52 performs the same function as the SIP proxy server. The P-CSCF 52 performs compression / decompression of SIP messages, authentication and QoS measurement of bearer resources, and a SIP register request from a terminal. Performs functions such as passing to CSCF. The S-CSCF 54 controls the session for the terminal and functions to maintain session state for service maintenance. I-CSCF 54 receives the SIP request from another network and routes it to S-CSCF 56, where the address of S-CSCF 56 is obtained from HSS 70. In other words, the I-CSCF functions to forward SIP requests and responses to the S-CSCF. The P-CSCF 52, S-CSCF 56, and I-CSCF 54 will be apparent to those skilled in the art, and thus a detailed description thereof will be omitted.

The HSS 70 is developed from the Home Location Register (HLR) of mobile communication and is a centralized database for managing subscriber information. The HSS 70 performs functions such as user registration / change management, authentication, authorization, location, session routing, and billing.

The IMS network 100 is a gateway layer that connects other IMS networks with a public switched telephone network (PSTN) and other existing networks and carrier operation support systems, and SIP-based such as games, video, and group chat. The application layer may further include an application layer that provides an application and includes user service logic. Since the IMS network 100 will be apparent to those skilled in the art, a detailed description thereof will be omitted.

The calling terminal 10 and the called terminal 30 are mobile communication terminals capable of processing SIP signaling, and not only a mobile phone as shown in the figure, but also all communication capable of performing communication through the IMS network 100 such as a PDA. It will be apparent to those skilled in the art that the communication device can be implemented equally.

Hereinafter, a call processing process in the entire system according to the present embodiment will be described.

2 is a flowchart illustrating a call processing process in a general IMS network, FIG. 3 is a flowchart illustrating a call processing process in an IMS network according to an embodiment of the present invention, and FIG. 4 is a preferred embodiment of the present invention. An exemplary diagram illustrating an INVITE SIP message transmitted from an originating terminal according to an embodiment.

Referring to FIG. 2, in step S210, the calling party S-CSCF 203 that receives a call request (that is, INVITE including a TEL URL) from the calling party 10 through the calling party P-CSCF 201 The ENUM server (not shown) recognizes the IP (Internet Protocol) address of the called party's I-CSCF 205 corresponding to the TEL URL and transmits the call request. Therefore, in a general IMS network, a call (ie, a session) is established between the calling terminal 10 and the called terminal 30 through the ENUM server.

In comparison, referring to FIG. 3 according to a preferred embodiment of the present invention, in step S310, the calling party S-CSCF 203 determines whether an ENUM server exists in the corresponding IMS network 100, and if it exists, The process may proceed in the same manner as in step S210 of FIG. 2.

If the ENUM server does not exist as a result of the determination in step S310, in step S320, the calling party S-CSCF 203 receives the called party information of the INVITE SIP message from the calling terminal 10 as shown in FIG. Call the caller by recognizing the called party's I-CSCF 205 corresponding to the prefix of the INVITE TEL (see '01030' of the telephone number 010-3010-1804). Here, of course, the calling party S-CSCF 203 may always be aware that the ENUM server is not interworked, so that step S310 may be omitted and step S320 may always be performed.

That is, the calling party S-CSCF 203, when the call request from the calling terminal 10 comes up to the TEL URL, the phone number of the called terminal 30 so as to go to the I-CSCF 205 of the called network. Function to recognize IP address of specific I-CSCF corresponding to. Like the Mobile Switching Center (MSC), which is a switch in a circuit switching network, the originating S-CSCF 203 uses the prefix information of the called terminal 30 telephone number to correspond to the corresponding called party I-CSCF 205. ) Translate the IP address of the number.

5 is a functional block diagram of a call session control device (CSCF) of the IMS network according to an embodiment of the present invention.

Referring to FIG. 5, the CSCF 50 of the IMS network 100 includes a number translation unit 510, a storage unit 530, and a call processing unit 550.

The number translation unit 510 analyzes the telephone number of the called terminal 30 included in the INVITE SIP message from the calling terminal 10, and functions to recognize the IP address of the corresponding called party's CSCF. The number translator 510 recognizes a specific device (that is, the called party's CSCF) by using the telephone number, as described above, by using the telephone number of the called terminal at the exchange of the circuit-switching network. Since the same or similar may be performed, it will be apparent to those skilled in the art, so detailed description thereof will be omitted.

The storage unit 530 stores IP addresses of the I-CSCF according to each prefix information. Of course, IP address information of the I-CSCF according to the prefix information is stored in a separate device (for example, the HSS 70, etc.), and the call session control device 50 is linked to the called party's prefix information in association with the corresponding device. The IP address of the corresponding I-CSCF can be obtained.

The call processing unit 550 interprets the INVITE SIP message from the calling terminal 10, recognizes the IP address of the called party's CSCF corresponding to the called terminal 30, and requests a call to the called party's CSCF (for example, The INVITE SIP message is transmitted to control the number translation unit 510 and the storage unit 530 so that a call between the calling terminal 10 and the called terminal 30 is established.

Of course, although not shown in the figure, the CSCF 50 of the IMS network 100 is an IMS such as a communication unit for communicating with other devices (eg, the HSS 70, etc.) of the IMS network 100 physically coupled. It will be apparent to those skilled in the art that other components may be further included to perform functions as the call session control device of the network 100.

The method of the present invention as described above may be implemented in a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, according to the present invention, a method and apparatus for processing a call in an IMS network that can process a call without an ENUM server can be provided.

In addition, the present invention determines the establishment of the ENUM server according to the network operator's request, there is an effect that can determine whether to build the ENUM server to correspond to the environment of the network that can improve the call processing efficiency.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art that various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below And can be changed.

Claims (5)

In the call processing method in the call session control device of the IMS network, Receiving a call request including called party information from the calling terminal; Determining whether an ENUM server exists in the IMS network; If the ENUM server does not exist, recognizing an IP address of a corresponding called party session control device using prefix information of a called number included in the called number information; And Requesting a call to the called party call session control device using the IP address, and setting up a call between the calling terminal and the called terminal corresponding to the called number, And the called number information is a TEL (telephone) URL. delete The method of claim 1, The call session control apparatus of the IMS network is a call session control function (CSCF) characterized in that the call processing method in the IMS network. In the call session control apparatus of the IMS network, A communication unit which receives a call request including called party information from the calling terminal; It is determined whether an ENUM server exists in the IMS network, and if the ENUM server does not exist as a result of the determination, the corresponding called party call session control apparatus is used by using prefix information of the called party included in the called party information. A number translation unit for recognizing an IP address; And A call processing unit for setting a call between the originating terminal and the called terminal corresponding to the called number by requesting a call to the called party session control device using the IP address; The incoming call information is a call session control device of an IMS network, characterized in that a TEL (telephone) URL. In the recording medium in which the program is tangibly embodied to be executed in the digital processing device for the call processing method in the call session control device of the IMS network, which can be read by the digital processing device. Receiving a call request including called party information from the calling terminal; Determining whether an ENUM server exists in the IMS network; If the ENUM server does not exist, recognizing an IP address of a corresponding called party session control device using prefix information of a called number included in the called number information; And Requesting a call to the called party call session control device using the IP address, and setting up a call between the calling terminal and the called terminal corresponding to the called number, And the called number information is a telephone call method in an IMS network, characterized in that a TEL (telephone) URL.

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