KR101075750B1 - Method and system for providing multimedia ring-back tone in multimedia telephony service network - Google Patents

Abstract

The present invention relates to a multimedia telephone service network. The calling terminal talks to the called terminal through the multimedia telephone service network and plays the multimedia ringback tone. The originating call server processes the call establishment request of the originating terminal. The called server is connected to the calling call server and calls the called terminal according to the call setting request of the calling terminal, and includes authentication information of the calling terminal including a call identifier, a user identifier, a list of supported codecs, and multimedia ringback tone reception setting information. Store in the tone application server, and performs authentication of the calling terminal by the tone application server. The content server requests the tone application server to authenticate the calling terminal in response to the multimedia ringback tone request from the calling terminal, and upon receiving the successful authentication result of the calling terminal from the tone application server, establishes a connection with the calling terminal and establishes a connection. Provides a multimedia ringback tone. The present invention secures security between the calling terminal and the content server and prevents the terminal from playing a multimedia ringback tone.

SIP, MULTIMEDIA RING-BACK TONE, CONTENTS SERVER, HTTP

Description

METHOD AND SYSTEM FOR PROVIDING MULTIMEDIA RING-BACK TONE IN MULTIMEDIA TELEPHONY SERVICE NETWORK}             

1 is a block diagram of a SIP-based multimedia telephone service network to which the present invention is applied.

2 is a diagram illustrating a basic procedure for providing a multimedia ring back tone in a multimedia telephone service network.

3 is a diagram illustrating a procedure for providing a multimedia ringback tone in a multimedia telephone service network according to a preferred embodiment of the present invention.

4 is a call processing flow diagram for providing a multimedia ring back tone in accordance with a preferred embodiment of the present invention.

5 is a flowchart illustrating the operation of a calling terminal according to a preferred embodiment of the present invention.

6 is a flowchart illustrating the operation of a content server according to a preferred embodiment of the present invention.

7 is a flowchart illustrating the operation of a tone application server according to a preferred embodiment of the present invention.

The present invention relates to a multimedia telephone service network, and more particularly, to a method and system for performing authentication between a content server and a calling terminal in order to provide a multimedia ringback tone to a caller during call setup.

3GPP (3rd Generation Partnership Project) Internet Protocol (IP) Multimedia Subsystem (IMS) or 3GPP2 Multimedia Domain (MMD) is introduced to provide IP-based packet communication services in 3G mobile communication networks. It became. As the Internet access through the mobile communication network is enabled as described above, researches for accessing various services available only on the Internet to the mobile communication system have been made.

IMS is based on the Session Initiation Protocol (hereinafter referred to as SIP), which is a text-based application layer control protocol. SIP is based on a client / server architecture in which the server responds when clients initiate a call, allowing one or more participants to create, modify, and terminate a session together. These sessions include teleconferences over the Internet, telephone calls, visits, event notifications, instant messaging, and the like. SIP conforms to existing text-based Internet standards to facilitate troubleshooting and network debugging.

In a SIP-based multimedia telephony environment, a 180 ringing message is used to provide a ring-back tone. The originating terminal receiving the ringing message generates a local ringback tone or reproduces ringback tone data carried in the ringing message to provide the ringback tone to the user. At this time, if the ringing message includes an Alert-Info header, the originating terminal receives a ringback tone from a Contents Server indicated by a specific Uniform Resource Locator (URL) described in the Alerting-Info. It is provided. An example of the alerting information is as follows.

Alert-Info Example:

Alert-Info: <http://www.example.com/sounds/moo.wav>

The alerting-information represents a ringback tone called moo.wav stored in a content server called.

However, the use of the alerting information may cause serious security problems. For example, the alerting information may be hacked by a malicious user to include an incorrect or tampered URL. In this case, the calling terminal may play inappropriate or offensive content. In order to solve this problem, it is possible to help the terminal correctly interpret the URL by notifying the characteristics of the URL by using the call-information header. An example of the call-information header is as follows.                         

Call-Info Example:

Call-Info: <http://wwww.example.com/alice/photo.jpg>; purpose = icon,

<http://www.example.com/alice/>; purpose = info

The call-information indicates the purpose of use of the URL included in the alerting-information. Here, "purpose = icon" means that the file photo.jpg is an image, and "purpose = info" means that the URL "http://www.example.com/alice" is simply used for providing information. do.

As communication technology develops and user demands are diversified, ringback tones are evolving from simple tones or music to multimedia ring-back tones that include still images or video and sound. Similarly, the terminal accesses the content server using the URL of the content server loaded in the ringing message and acquires the multimedia ringback tone. Such a multimedia ringback tone has a larger capacity than the existing ringback tone, and thus causes more fatal problems such as terminal viruses when exposed to malicious users. In other cases, the paid multimedia ringback tone subscribed to the terminal may be exposed to illegal users. However, the conventional multimedia telephone system does not provide an authentication procedure between the terminal and the content server.

Furthermore, the multimedia ringback tone may be produced in various media types. If the terminal does not have a proper codec capable of processing the multimedia ringback tone provided from the content server, the terminal cannot play the multimedia ringback tone. there was.

Accordingly, an object of the present invention, which was created to solve the problems of the prior art operating as described above, is an authentication method and apparatus between an originating terminal and a content server for receiving a multimedia ringback tone using a URL of a content server. To provide.

Another object of the present invention is to provide a method and an apparatus in which a terminal and a content server receive a multimedia ringback tone reproduced by a terminal through codec negotiation.

An embodiment of the present invention, which was created to achieve the above object, in a system for providing a multimedia ringback tone in a multimedia telephone service network,

A calling terminal connected to the multimedia telephone service network and capable of playing a multimedia ringback tone;

A called terminal connected to the multimedia telephone service network;

An originating call server for processing a call establishment request of the originating terminal;

Is connected to the calling server and calls the called terminal according to a call setup request of the calling terminal, stores authentication information of the calling terminal in a tone application server, and performs authentication of the calling terminal by the tone application server. Incoming call server,

In response to the multimedia ringback tone request from the calling terminal, requesting the tone application server to authenticate the calling terminal, and upon receiving a successful authentication result of the calling terminal from the tone application server, establish a connection with the calling terminal. It characterized in that it comprises a content server for providing a multimedia ring back tone through the connection.

Another embodiment of the present invention provides a multimedia ringback tone by the calling terminal in a multimedia telephone service network including an outgoing and incoming call server connected to calling and receiving terminals and a content server storing the multimedia ringback tone. In the way of receiving,

Transmitting a call setup message to the incoming call server through the outgoing call server;

Receiving a ringing message including an address of the content server in response to the call setup message from the incoming call server through the outgoing call server;

Transmitting a request message for requesting authentication and multimedia ringback tone to the content server by referring to the address;

Checking whether an authentication result and the requested multimedia ringback tone are received in response to the request message;

And if the authentication result is successful and the requested multimedia ringback tone is received, playing the multimedia ringback tone.

Still another embodiment of the present invention provides a multimedia ringback tone by the content server in a multimedia telephone service network including an outgoing and incoming call server connected to originating and terminating terminals, and a content server storing the multimedia ringback tone. In the method of providing,

Receiving a request message for requesting authentication and multimedia ringback tone from the calling terminal;

Requesting authentication of the calling terminal from a tone application server of the called call server, which stores authentication information of the calling terminal, and receiving an authentication result;

And if the authentication result is successful, transmitting the requested multimedia ringback tone to the calling terminal.

Another embodiment of the present invention provides a tone application server of an incoming call server in a multimedia telephone service network including outgoing and incoming call servers connected to originating and incoming terminals, and a content server storing a multimedia ringback tone. In the method for receiving a multimedia ringback tone,

Receiving an authentication request of the calling terminal from the content server;

Determining whether the authentication information of the calling terminal is already stored according to the authentication request;

If the authentication information of the calling terminal is not stored, transmitting a response message indicating authentication failure to the content server;

If the authentication information of the calling terminal is stored, determining whether the calling terminal can receive the multimedia ringback tone according to the multimedia ringback tone reception setting information of the calling terminal;

If the calling terminal can receive the multimedia ringback tone, transmitting the supported codec list of the calling terminal to the content server in a response message indicating authentication success;

If the originating terminal is unable to receive the multimedia ringback tone, it comprises the step of transmitting the multimedia ringback tone prohibition information to the content server in a response message indicating the authentication success.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

1 illustrates a configuration of a SIP-based multimedia telephone service network to which the present invention is applied. As illustrated, the SIP-based multimedia telephone service network 100 includes call servers 120 and 130 connected to incoming / outgoing terminals 110 and 160, and a content server 150 providing a multimedia ring back tone. Is made of. Inside the incoming call server 140, there is a tone application server (Application Server: AS) 140 in charge of multimedia ringback tone processing.

The incoming / outgoing terminals 110 and 160 may be wired, wireless or wired / wireless integrated terminals, and have processing power capable of playing multimedia. In particular, the originating terminal 110 performs authentication with the content server 150 using the URL of the content server 150 transmitted through an alerting-information header of a ringing message, and performs multimedia from the content server 150. Receive a ringback tone. In addition, the calling terminal 110 negotiates the codec information of the multimedia ringback tone with the content server 150, and provides an option to prohibit the reception of the multimedia ringback tone by the calling subscriber.

The incoming / outgoing call servers 120 and 130 are responsible for call setup / release between the incoming / outgoing terminals 110 and 160. Tone AS 140, which authenticates the originating terminal 110 requesting the multimedia ringback tone and provides codec information, is a local AS of incoming call server 130. Tone AS 140 requests the multimedia ringback tone to content server 150 as needed and adds an alerting-info header to the ringing message delivered to originating terminal 110 via originating call server 120. When there is an authentication request for the calling terminal 110 from the content server 150, the tone AS 140 performs authentication on the calling terminal 110 and transmits the authentication result to the content server 150. Tone AS 140 stores information necessary for authentication of originating terminal 110 in an authentication database (not shown).                     

The content server 150 is a device for providing a multimedia ringback tone. When the multimedia ringback tone request is generated from the caller terminal 110, the content server 150 requests the caller server 130 to authenticate the caller terminal 110. It is determined whether to provide a multimedia ringback tone according to. Also, the calling terminal 110 selects a multimedia ringback tone to be transmitted based on the codec information that can be processed.

2 shows a basic procedure for providing a multimedia ring back tone in a multimedia telephone service network.

Referring to FIG. 2, in step ①, the calling terminal 110 requests a call setup to the called terminal 160, and in step ②, a ringing message indicating that the call is being ringed from the called terminal 160 to the called server 130. Is sent. When the ringing message is transmitted from the incoming call server 130 to the originating call server 120 in step ③, the calling terminal 110 in step ④ uses the content server (URL) of the alerting-information included in the ringing message. 150) to request a ringing tone. In process ⑤, a connection is created between the calling terminal 110 and the content server 150, and the content server 150 provides the multimedia ringback tone to the calling terminal 110 through the connection. In step ⑥, the calling terminal plays the multimedia ringback tone provided by the content server and listens to the subscriber.

In the procedure illustrated in FIG. 2, the reliability of the connection generated between the calling terminal 110 and the content server 150 may not be guaranteed. In addition, since the multimedia ringback tone provided by the content server 150 may be encoded using various codecs, the originating terminal 110 may not play.                     

3 illustrates a procedure for providing a multimedia ringback tone in a multimedia telephone service network according to a preferred embodiment of the present invention.

Referring to FIG. 3, in step 1, the calling terminal 110 requests the called server 130 to set up a call to the called terminal 160. At this time, the calling terminal 110 provides a list of codecs available for multimedia ringback tone reproduction and reception setting information of the multimedia ringback tone. In process ②, the incoming call server 130 requests the call terminal 160 to set up the call, and the tone AS 140 located in the incoming call server 130 performs authentication required when performing the authentication request of the calling terminal 110. Store the information in the authentication database. The authentication information includes a call identifier (Call-ID), a user identifier of the calling terminal 110, a codec list supported by the calling terminal 110, and reception setting information of the multimedia ringback tone of the calling terminal 110. The reception setting information may be set by the calling subscriber of the calling terminal 110 and indicates whether to allow reception of the multimedia ring back tone.

In step 3, the called terminal 160 transmits a ringing message indicating that the called server 130 is ringing. Then, in step ④, the incoming call server 130 transmits a ringing message to the calling terminal (160). The alerting-information field of the ringing message includes the URL of the content server 150, and the purpose of using the URL is included in the call-information field.

In step ⑤, the calling terminal 160 transmits a multimedia ringback tone request message for requesting a multimedia ringback tone to the content server 150 using the URL of the content server 150 loaded in the alerting-information field of the ringing message. do. The multimedia ringback tone request message includes a call identifier for authentication and a user identifier of a calling terminal.

In the process ⑥, the content server 150 requests the authentication of the calling terminal 110 to the incoming call server 130. The tone AS 140 then processes the authentication request of the content server 150 using the previously stored call identifier and the user identifier of the calling terminal 110. When the authenticating result of the originating terminal 110 can be trusted, the tone AS 140 analyzes the multimedia ringback tone reception setting information of the originating terminal 110. As a result of the analysis, if the originating terminal 110 is capable of receiving the multimedia ringback tone, the tone AS 140 loads the codec list supported by the originating terminal 110 in the response message including the authentication result to the content server 150. send. Although the authenticating result is that the originating terminal 110 can be trusted, if the originating terminal 110 is prohibited from receiving the multimedia ringback tone, the tone AS 140 loads the multimedia ringback tone transmission prohibition information in the response message and loads the content server 150. To send). Tone AS 140 transmits to the content server 150 by indicating the authentication failure in the response message when the authentication result originating terminal 110 is unreliable.

When the authentication success response message including the codec list is received from the tone AS 140 to the content server 150, a connection is generated between the calling terminal 110 and the content server 150 in step ⑦, and through the connection. The content server 150 provides the multimedia ring back tone to the calling terminal 110. At this time, the content server 150 transmits the authentication result ('success') with respect to the calling terminal 110 to the calling terminal 110. In addition, the multimedia ringback tone provided to the calling terminal 110 is selected by referring to the list of codecs supported by the calling terminal 110. That is, the content server 150 selects a multimedia ringback tone that can be played with a codec supported by the calling terminal 110 and transmits it to the calling terminal 110. If the calling terminal 110 does not have a codec necessary for playing the multimedia ringback tone provided by the content server 150, the content server 150 transmits a default ringback tone to the terminal. The default ringback tone has a separate form designated by the operator or machine sound by frequency combination. On the other hand, when the authentication failure response message is received, the content server 150 does not create a connection with the calling terminal 110.

If the authentication result is successful, in step ⑧, the calling terminal 110 plays the multimedia ringback tone provided by the content server 150 to the subscriber. When the multimedia ringback tone reception prohibition option is set by the calling subscriber or when the authentication result is unsuccessful, the calling terminal 110 provides the local ringback tone stored in advance.

In the present invention, an interface for transmitting a multimedia ringback tone between a calling terminal and a content server is as follows.

If the calling terminal is reliable and the calling terminal is in a state capable of receiving a multimedia ringback tone, a connection for transmitting a multimedia ringback tone is generated between the calling terminal and the content server.

To provide various multimedia contents including audio, video, text, flash, etc. in ringback tone, the content server uses HTTP (hypertext transfer protocol) as a protocol for data transmission. The content server acts as an HTTP server and the originating terminal acts as an HTTP client. The content server and the originating terminal are both ends of the HTTP connection.

4 shows a call processing flow diagram for providing a multimedia ring back tone in accordance with a preferred embodiment of the present invention. The incoming call server 130 and the tone AS 140 are not shown separately.

Referring to FIG. 4, in step 210a, the calling terminal 110 transmits an invitation message including a codec list and reception setting information available for playing a multimedia ringback tone to request a call setting. 120). In step 210b, the invitation message is reached by the originating call server 120 to the tone AS 140 of the incoming call server 130. Tone AS 140 in step 215 stores the authentication information of the originating terminal 110 included in the invitation message, and in step 220, the incoming call server 130 the destination terminal 160 to the invitation message; To pass. The authentication information includes a call identifier, a user identifier, a codec list, multimedia ring back tone reception setting information, and the like. In step 225, a call establishment procedure is established such that a call path is established between the calling terminal 110 and the called terminal 160 according to the successful call of the called terminal 160.

In step 230, the called terminal 160 generates a ringing message, and in steps 235a, 235b, and 235c, the ringing message passes through the incoming call server 130 and the outgoing call server 120. To reach At this time, the tone AS 140 of the incoming call server 130 inserts multimedia ringback tone information, that is, the URL of the content server 150, into the alerting-information field of the ringing message, and the purpose of the URL in the call-information field. Insert In step 240, the calling terminal 110 transmits a multimedia ringback tone request message to the content server 150 using the call identifier and the user identifier. In step 245, the content server 150 requests the authentication of the calling terminal 110 to the tone AS 140 of the incoming call server 130 to perform the request received from the calling terminal 110.

In step 250, the tone AS 140 performs authentication on the calling terminal 110 by using the information stored in the step 215. Tone AS 140 analyzes the multimedia ringback tone reception setting information when the authentication result originating terminal 110 can be trusted. As a result of the analysis, if the originating terminal 110 can receive the multimedia ringback tone, in step 255, the tone AS 140 loads the codec list supported by the originating terminal 110 in the response message according to the authentication result, and then the contents. Send to server 150. If the originating terminal 110 is prohibited from receiving the multimedia ringback tone even if the originating terminal 110 is trusted, the tone AS 140 loads the multimedia ringback tone transmission prohibition information in the response message to the content server 150. send. In addition, when the authentication result originating terminal 110 is not trusted, the tone AS 140 transmits an authentication failure response message to the content server 150.

If the authentication result included in the response message is successful and the codec list is included, the content server 150 selects the multimedia ringback tone using the codec list supported by the calling terminal 150 and accesses the calling terminal 110. Create In operation 260, the content server 150 transmits the authentication result to the calling terminal 150. On the other hand, when the response message includes the multimedia ringback transmission prohibition information or the authentication result is unsuccessful, the content server 150 transmits the authentication result to the calling terminal 100. At this time, the connection with the calling terminal is not created.                     

If the authentication result is successful and the multimedia ringback tone is received, the calling terminal 110 creates a connection with the content server 150 in step 265 and receives the selected multimedia ringback tone from the content server. The calling terminal 110 plays the multimedia ringback tone. On the other hand, if the authentication result is failed or the multimedia ringback tone is not provided, the calling terminal 110 plays the local ringback tone. In step 270, a hook-off signal is generated from the called terminal 160 to establish a path for transmitting traffic between the calling terminal 110 and the called terminal 160 to complete the call setup and make a call. Alternatively, the call setup is terminated because the call fails because there is no response from the called terminal 160.

5 is a flowchart illustrating the operation of a calling terminal according to a preferred embodiment of the present invention.

Referring to FIG. 5, a call establishment request message (invitation message of FIG. 4) is sent in step 310, and a ringing message including alerting-information and call-information is received in step 315. In step 320, the originating terminal transmits a message requesting authentication and multimedia ringback tone (RBT) to the content server according to the URL described in the alerting-information, and in step 325, the multimedia ringback tone is received from the content server. Check if it works.

If the multimedia ringback tone is received, the calling terminal plays the multimedia ringback tone in step 330. On the other hand, if the multimedia ringback tone is not received and the authentication success response message including the authentication failure response message or the multimedia ringback tone reception prohibition information is received, the calling terminal reproduces the local ringback tone stored in advance in step 335. In step 340, call setup is completed according to whether the called terminal responds.

6 is a flowchart illustrating the operation of a content server according to a preferred embodiment of the present invention.

Referring to FIG. 6, in step 410, the content server receives a message for requesting authentication and multimedia ringback tone (RBT) from an originating terminal, and in step 415, the call server and the user identifier included in the request message. By using the tone AS to request the authentication of the calling terminal to receive the authentication result. In step 420, the content server determines whether the authentication result is successful. If the authentication result is unsuccessful, in step 425, the content server transmits a response message indicating the authentication failure to the calling terminal. On the other hand, if the authentication result is successful, the process proceeds to step 430.

In step 430, the content server transmits a response message indicating the authentication success to the calling terminal. Then, in step 435, it is determined whether the calling terminal can receive the multimedia ringback tone according to the authentication result. In this case, the content server determines whether the calling terminal can receive the multimedia ringback tone according to whether the response message indicating the authentication success includes the multimedia ringback tone prohibition information or the list of supported codecs of the calling terminal. To judge.

If the calling terminal is unable to receive the multimedia ringback tone, in step 440 the content server instructs the calling terminal to play the local ringback tone or provides a pre-stored default ringback tone. On the other hand, if the calling terminal can receive the multimedia ringback tone, in step 445, the content server refers to the codec list of the calling terminal included in the authentication result received from the tone AS, to determine the multimedia ringback tone that the calling terminal can play. Select and establish a connection with the calling terminal. In step 450, the selected multimedia ringback tone is transmitted to the calling terminal through the set connection.

7 is a flowchart illustrating the operation of the tone AS according to the preferred embodiment of the present invention.

Referring to FIG. 7, in step 510, the tone AS in the incoming call server receives a message requesting an authentication and codec list from a content server, and in step 515 a call identifier and a user identifier included in the request message Verify that it is stored in the authentication database. If not stored, the tone AS in step 520 sends a response message indicating the authentication failure to the content server. On the other hand, if stored, the tone AS in step 525 refers to the multimedia ringback tone reception setting information of the calling terminal stored in the authentication database to determine whether the calling terminal has allowed to receive the multimedia ringback tone.

If the multimedia ringback tone can be received, the tone AS in step 530 includes the codec list of the calling terminal stored in the authentication database in the response message indicating authentication success. On the other hand, if the reception of the multimedia ringback tone is not possible, the tone AS includes the prohibition information in the response message indicating the authentication success in step 535. In step 540, the response message of step 530 or step 535 is transmitted to the content server.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention that operates as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

-Prevent the originating terminal from accessing the malicious content server.

-By receiving illegal contents in multimedia ringback tone, it can prevent the terminal from malfunctioning.

-It is possible to prevent unauthorized or malicious users from accessing the content server.

By selectively transmitting the content that can be played by the terminal by the content server, it is possible to prevent a problem that the terminal cannot play the multimedia ringback tone.

-The originating terminal does not provide the multimedia ringback tone when the prohibition of receiving the multimedia ringback tone is set by the calling subscriber.

Claims (21)

A system for providing a multimedia ring back tone in a multimedia telephone service network, A calling terminal connected to the multimedia telephone service network and capable of playing a multimedia ringback tone; A called terminal connected to the multimedia telephone service network; An originating call server for processing a call establishment request of the originating terminal; Is connected to the calling server and calls the called terminal according to a call setup request of the calling terminal, stores authentication information of the calling terminal in a tone application server, and performs authentication of the calling terminal by the tone application server. Incoming call server, In response to the multimedia ringback tone request from the calling terminal, requesting authentication of the calling terminal from the tone application server, and upon receiving a successful authentication result of the calling terminal from the tone application server, establishing a connection with the calling terminal and And a content server providing a multimedia ringback tone through a connection. The method of claim 1, wherein the authentication information, And a call identifier and a user identifier of the calling terminal. The method of claim 2, wherein the authentication information, The multimedia ringback tone providing system further comprises a list of codecs that can be supported by the calling terminal. The method of claim 2 or 3, wherein the authentication information, Multimedia ringback tone providing system, characterized in that it further comprises a multimedia ringback tone reception setting information set by the calling terminal. The method of claim 1, wherein the connection between the originating terminal and the content server, A hypertext transfer protocol (HTTP) connection, wherein the content server acts as an HTTP server and the originating terminal acts as an HTTP client. The method of claim 1, wherein the calling terminal, If the multimedia ring back tone is not received from the content server, the multimedia ring back tone providing system, characterized in that for playing the pre-stored local ring back tone. The method of claim 1, wherein the calling terminal, And providing a list of codecs supported by the calling terminal and multimedia ringback tone reception setting information set by the calling terminal to the tone application server through the call setup request. The tone application server of claim 1, wherein And a ringback tone information indicating an address of the content server is inserted into a ringing message transmitted to the originating terminal in response to a call establishment request of the originating terminal. The method of claim 1, wherein the content server, Multimedia ringback tone providing system characterized in that for transmitting the authentication result received from the tone application server to the calling terminal. The method of claim 1, wherein the content server, And selecting a multimedia ringback tone that can be played back by the calling terminal according to the list of codecs supported by the calling terminal, and providing the selected multimedia ringback tone to the calling terminal. Claims [1] A method for receiving a multimedia ringback tone by a calling terminal in a multimedia telephone service network comprising an outgoing and incoming call server connected to originating and terminating terminals and a content server storing a multimedia ringback tone. Transmitting a call setup message to the incoming call server through the outgoing call server; Receiving a ringing message including an address of the content server in response to the call setup message from the incoming call server through the outgoing call server; Transmitting a request message for requesting authentication and multimedia ringback tone to the content server by referring to the address; Checking whether an authentication result and the requested multimedia ringback tone are received in response to the request message; And if the authentication result is successful and the requested multimedia ringback tone is received, playing the multimedia ringback tone. The method of claim 11, wherein the call setup message, And a multimedia ringback tone reception setting information set by the calling terminal and a list of codecs supported by the calling terminal. 12. The method of claim 11, further comprising: reproducing a local ringback tone stored in advance if the authentication result is unsuccessful or the requested multimedia ringback tone is not received. 12. The method of claim 11, further comprising: reproducing a default ringback tone received from the content server if the authentication result is unsuccessful. Claims [1] A method for providing a multimedia ringback tone by a content server in a multimedia telephone service network, comprising: originating and incoming call servers connected to originating and terminating terminals, and a content server storing multimedia ringback tones. Receiving a request message for requesting authentication and multimedia ringback tone from the calling terminal; Requesting authentication of the calling terminal from a tone application server of the called call server, which stores authentication information of the calling terminal, and receiving an authentication result; And if the authentication result is successful, transmitting the requested multimedia ringback tone to the calling terminal. The method of claim 15, wherein the transmitting of the multimedia ringback tone comprises: Determining whether the authentication result includes the multimedia ringback tone prohibition information of the calling terminal or a list of codecs supported by the calling terminal; Selecting a playable multimedia ringback tone of the calling terminal and establishing a connection with the calling terminal by referring to the codec list if the list of supported codecs is included; And transmitting the selected multimedia ringback tone to the calling terminal through the set connection. 17. The method of claim 16, further comprising transmitting a default ringback tone stored in advance to the calling terminal if the multimedia ringback tone reception prohibition information is included. 17. The method of claim 16, further comprising instructing the calling terminal to play the local ringback tone stored in advance when the multimedia ringback tone prohibition information is included. The method of claim 15, further comprising transmitting a response message indicating the authentication result to the calling terminal. A method for receiving a multimedia ringback tone by a tone application server of an incoming call server in a multimedia telephone service network comprising an outgoing and incoming call server connected to originating and incoming terminals and a content server storing a multimedia ringback tone. In Receiving an authentication request of the calling terminal from the content server; Determining whether the authentication information of the calling terminal is already stored according to the authentication request; If the authentication information of the calling terminal is not stored, transmitting a response message indicating authentication failure to the content server; If the authentication information of the calling terminal is stored, determining whether the calling terminal can receive the multimedia ringback tone according to the multimedia ringback tone reception setting information of the calling terminal; If the calling terminal can receive the multimedia ringback tone, transmitting the supported codec list of the calling terminal to the content server in a response message indicating authentication success; And if the calling terminal cannot receive the multimedia ringback tone, transmitting the multimedia ringback tone prohibition information to the content server in a response message indicating authentication success. The method of claim 20, wherein the authentication information, And a call identifier, a user identifier, the codec list, and the multimedia ringback tone reception setting information of the originating terminal.

Images