KR20040099916A - Service System and Method for Displaying Image by Calling Party and Communication Terminal - Google Patents

Abstract

PURPOSE: A system and method for displaying a caller image by using an SIP protocol and a communication terminal therefor are provided to display an image designated by a caller on a screen of a callee in an SIP-based wired/wireless communication service when a call is set. CONSTITUTION: When an origination terminal transmits a session setting request message(INVITE) to an SIP(Session Initiation Protocol) server(S101), the SIP server checks whether the origination subscriber has been subscribed for the service and performs authentication(S102). When the origination subscriber is authenticated, the SIP server transmits INVITE message including an image request message to an image server(S103). The image server refers to image information of the origination subscriber(S104), generates an image message including the referred image(S105) and forwards the image-added INVITE message to the SIP server(S106). The SIP server transfers the image-added INVITE message to a destination terminal(S107). A message informing that the destination terminal is ringing is transferred to the origination terminal from the destination terminal via the SIP server(S108). When the destination terminal answers the call, a message including a state code is transferred to the origination terminal(S109). When an ACK request message is transferred to the destination terminal from the origination terminal, a session is generated for call communication(S110).

Description

Service system and method for displaying caller image using SIP protocol and communication terminal for same {Service System and Method for Displaying Image by Calling Party and Communication Terminal}

The present invention relates to a caller image display service system and method using the SIP protocol. More particularly, the present invention relates to a service system and method for displaying an image designated by a caller through a caller's screen when establishing a call in a SIP-based wired / wireless communication service. It is about.

In the future, in the wired / wireless multimedia communication environment using SIP, free multimedia communication is possible unlike in the present, and in particular, a service for displaying the image specified by the caller on the called party's terminal during the call setup process as the caller attempts to call the called party. Is likely to be widely used to attract the interest of many users.

Since the IP-based multimedia communication service using SIP is not currently active, a technology for providing various additional services related to a call service in such an environment has not been proposed.

Accordingly, the present invention is to solve the above-mentioned disadvantages and problems of the prior art, the service system to display the image specified by the caller in the SIP-based wired, wireless communication service through the receiver screen when the call is set up; and It is an object of the present invention to provide a method.

1 is a network diagram illustrating a caller image display service system according to an embodiment of the present invention;

2 is a schematic structural diagram showing a communication terminal according to an embodiment of the present invention;

3 is a call flow diagram illustrating a caller image display service method according to an embodiment of the present invention;

4 is a call flow diagram illustrating a caller image display service method according to another embodiment of the present invention;

5 is a call flow diagram illustrating a caller image display service method according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

10: IP network 11, 13: gateway

12: PLMN 14: PSTN

20: cellular phone 30: wired terminal

40: IP terminal 50: PDA

60: personal computer 100: SIP server

200: image server 300: communication terminal

310: image storage unit 320: message generating unit

The above object of the present invention is an image server for storing image information designated for transmission to a called terminal by a communication terminal subscriber having a SIP client function for establishing a call over the SIP protocol; Storing the service usage information of the calling subscriber and receiving a session establishment request message from the communication terminal, determining whether the caller subscribes to the service and, in the case of a service subscriber, setting up a session including corresponding image information stored in the image server A caller image display service system comprising a SIP server for sending a request message to a called terminal.

In addition, the object of the present invention is a communication terminal having a SIP client function for establishing a call through the SIP protocol, and having a message generating unit for generating a session establishment request message including an image storage unit and image information for storing an image; ; Upon receiving the session establishment request message including the image information from the terminal, confirming whether the caller subscribes to the service and transmitting the session establishment request message including the image information to the called terminal so that the image is displayed on the called terminal. Achievement is achieved by a caller image display service system comprising a SIP server.

In the present invention, two methods are possible as a method of delivering an image that the caller wants to be displayed on the called party's screen. In the first method, the caller attempts to call by attaching an image when the call is originated. The second method stores an image designated by the caller in the network server and downloads the image stored in the server to the called party's terminal when a call is attempted by the caller. to be.

In this case, the image generally refers to all types of still images or pictures that can be displayed on the terminal.

Details of the above object and technical configuration and the effects thereof according to the present invention will be more clearly understood by the following detailed description based on the drawings showing the preferred embodiments of the present invention.

First, Figure 1 is a network diagram for explaining a caller image display service system according to an embodiment of the present invention.

As shown, the image display service system of the present invention is based on the IP network 10 connected through the PLMN network 12, the PSTN network 14, and the gateways 11 and 13, It is configured to include a SIP server 100 and an image server 200 for a service.

A communication terminal applied to the present invention includes a communication service based on an IP network 10 such as a cellular phone 20, a wired terminal 30, an IP terminal 40, a PDA 50, a personal computer 60, and the like. It includes a variety of wired and wireless terminals to perform, the communication terminals should be provided with a function to display an image, and must be equipped with a SIP client function to enable call setup through a SIP server.

The SIP server 100 is a server for performing call setup of various services as well as VoIP service between terminals using a SIP protocol (SESSION INITIATION PROTOCOL) and controlling a text-based application layer control protocol.

The SIP protocol is a protocol for signal processing between a peer-to-peer and identifies a client using an e-mail address form and provides mobility of the client. That is, it supports the client using the same SIP address but with the mobility of registering, modifying, deleting, and retrieving locations from terminals or computers in different places, and fork function, session connection function, and request message of other request messages. It is a protocol that operates independently of the lower transport protocols (TCP, UDP, ATM, X.25) and performs the function of rejecting or suspending an active session.

The SIP server 100 receives a session establishment request message (INVITE) as a call is attempted from the communication terminal, determines whether to use the service of the subscriber who attempted the call, and sets the image to be displayed on the called terminal by the subscriber. The session establishment request message including the transmits to the destination terminal.

In this case, the image server 200 stores the image information designated by the calling subscriber as described above, and when receiving the image request message from the SIP server 100, the information of the subscriber is inquired and the image information set by the subscriber is recalled. It transmits to the SIP server 100, or includes the image message including the image information in the received message has a function to forward to the SIP server 100.

Accordingly, when the SIP server 100 receives the image information from the image server 200, the SIP server 100 generates a message including the image information and transmits the message to the called terminal or receives the image message generated by the image server 200. By transmitting the data back to the called terminal, an image corresponding to the image information is displayed on the called terminal.

On the other hand, the image server 200 may store at least one or more image information for each subscriber. At this time, when the calling subscriber selects a specific image by manipulating his terminal when the calling attempt is made, the communication terminal of the calling subscriber transmits a session establishment request message including an identifier parameter of the corresponding image to the SIP server 100, The SIP server 100 requests image information of the identifier parameter to the image server 200 so that the user can display a desired image among the plurality of images to the called terminal.

In addition, the image server 200 may store different images for each called number for one calling subscriber, and the SIP server 100 calls the calling number and the called number when requesting image information from the image server 200. The number must be sent together. The image server 200 may provide an image service for each called number by inquiring image information corresponding to the called number among a plurality of image information of the subscriber corresponding to the calling number.

In the present invention, it is preferable that the communication terminal can control whether or not the image is displayed by using its own terminal when the transmission attempt is made, wherein the communication terminal requests a session establishment including an identifier parameter indicating whether the image is displayed or not. The message is transmitted to the SIP server 100, and the SIP server 100 performs call setup according to the parameter.

Meanwhile, although a general SIP signaling message is transmitted through a UDP protocol, transmission of the image should be transmitted through a TCP protocol instead of a UDP protocol in consideration of its size, and its function should be supported by a terminal. In addition, the SIP server 100 or the image server 200 preferably measures the size of the image displayed by the called terminal and performs charging accordingly.

Meanwhile, the present invention may store the image information in the image server 200 as described above, and use the image server 200 when setting up a call, and store the image information in a communication terminal and the user manipulates his terminal. An image may be attached, which will be described below with reference to FIG. 2.

2 is a schematic structural diagram showing a communication terminal according to an embodiment of the present invention.

As shown, the communication terminal 300 according to an embodiment of the present invention is an image storage unit 310 for storing information about the image to be displayed by the calling subscriber to the called terminal, and the calling subscriber attempts to call And a message generator 320 for generating a session establishment request message including image information stored in the image storage unit 310.

The image storage unit 310 may store at least one or more image information. In this case, the calling subscriber selects any one of the plurality of image information and sends a call when the call is attempted, and the message generator 320 Generates a session establishment request message including corresponding image information.

Preferably, the communication terminal 300 allows the originating subscriber to manipulate whether or not to transmit an image when the call is attempted, and the message generator 320 is based on the data input during the call attempt. Determine whether to include the image information at the time of creation.

Meanwhile, as an embodiment, the image file of the session establishment request message as described above is included in the body part of the SIP signaling, and the Content-Type at this time is the existing Session Description Protocol using boundary parameters in multipart / mixed. ) Can be attached as a message. In this manner, the following information is included in the session establishment INVITE message among the SIP signaling messages.

INVITE sip: 0112931002@sktims.net; transport = tcp SIP / 2.0

Via: SIP / 2.0 / TCP 150.22.12.38:5060

From: "1003" <sip: 0112931003@sktims.net>; tag = 3394823717

To: sip: 0112931002@sktims.net

CSeq: 1 INVITE

Max-Forwards: 69

Call-ID: 4253515354@150.22.12.38

Contact: <sip: 150.22.12.38>

Accept: application / sdp

RPID-Privacy: privacy = off; party = calling

Content-Type: multipart / mixed; boundary = "simple boundary"

Content-Length: 8026

--simple boundary

Content-Type: application / sdp

Content-Length: 151

v = 0

o =-13026 32687 IN IP4 150.22.12.38

s =-

c = IN IP4 150.22.12.38

t = 0 0

m = audio 10524 RTP / AVP 4

a = fmtp: 4 maxptime = 300

m = video 64792 RTP / AVP 34

--simple boundary

Content-Type: image / jpeg

Content-Length: 7708

### image file ###

--simple boundary

Referring to the above message, the existing SIP message uses UDP as a transport protocol, but indicates that TCP is used when sending an attached image as in the present specification. In addition, the part indicated by multipart / mixed in the "Content-Type" header describing the content and type included in the body part of the SIP message indicates that the message is composed of several parts, where each part is a "Simple boundary". It is indicated by.

A portion below the “simple boundary” corresponds to a body portion of the SIP message, and includes session description protocol (SDP) information including session information and image related information to be included in the SIP message. The rest of the session is generally applied to SIP message rules used in session establishment. If the call setup procedure is performed as described above, the caller's attached image is shown when the incoming call signal or ring rings to the called terminal. will be. At this time, the message is an embodiment, the contents of the message may be changed according to each situation.

On the other hand, the image storage unit 310 of the communication terminal 300 may store the image information for each called number, the message generating unit 320 recognizes the incoming call number and the session including the image information accordingly It would be desirable to automatically generate a setup request message.

The session establishment request message generated as described above is transmitted to the SIP server 100 illustrated in FIG. 1, and the SIP server 100 checks whether the caller subscribes to the service and includes the session information including the image information. To be delivered to the called terminal.

3 is a call flow diagram illustrating a caller image display service method according to an embodiment of the present invention, and is applied to a system including a caller terminal, an image server, a SIP server, and a caller terminal.

As shown, the caller image display service method of the present invention first SIP the session establishment request message (INVITE) so that the call is established as the calling subscriber attempts to make a call using a communication terminal having a SIP client function When transmitting to the server 100 (S101), the SIP server 100 checks whether the originating terminal subscriber who has transmitted the session request message uses the service and performs an authentication procedure (S102).

At this time, the calling terminal subscriber may attempt to call by determining whether to display an image using his communication terminal.

On the other hand, when the authentication is completed as described above, the SIP server 100 transmits an INVITE message including an image request message for requesting an image corresponding to the originating subscriber to the image server 200 (S103).

In this case, when a plurality of image information of one originating subscriber is stored in the image server 200, the session establishment request message transmitted from the originating terminal should include a parameter for designating any one of the plurality of images. The SIP server 100 transmits the parameter including the parameter when the image request message is transmitted.

In addition, when a plurality of called party number image information for one originating subscriber is stored in the image server 200, the SIP server 100 when the transmission of the image request message, the destination number information that attempted to call It transmits to the image server 200 and requests the corresponding image.

Next, the image server 200 which has received the image request message as described above inquires the image information of the corresponding calling subscriber based on the received image request message (S104), and the received image to the received message An image message including an image is generated (S105), and an attached image containing INVITE message is forwarded to the SIP server 100 (S106).

The SIP server 100 transmits an INVITE message including an image obtained through the transmission and reception of a message with the image server 200 to the called terminal in the session establishment request message transmitted from the initial calling terminal (S107). The image is displayed on the display window of the called terminal receiving the message and a ring signal is output.

As described above, as the session establishment request message is transmitted to the called terminal, a message indicating that the other terminal is ringing from the called terminal to the calling terminal through the SIP server 100 ('180 RINGING' message in the SIP protocol). When the called terminal responds to the call, a message including a status code ('200 OK' message in the SIP protocol) is delivered to the calling terminal (S109). At this time, when the ACK request message is transmitted from the originating terminal to the called terminal through the SIP server, a session is generated and a call is performed (S110).

On the other hand, when the image specified by the caller is transmitted to the called terminal as described above, the SIP server or the image server performs the charging based on the rules set by the operator according to the size of the image.

4 is a call flow diagram illustrating a caller image display service method according to another embodiment of the present invention.

As shown, steps S201 and S202 in the embodiment of Fig. 4 are the same as steps S101 and S102 in Fig. 3 to describe only the subsequent steps.

When the subscription confirmation and authentication is completed, the SIP server 100 transmits an image request message for requesting the image of the subscriber to the image server 200 (S203). In this case, the image request message refers to a message transmitted by the SIP server 100 to the image server 200 through an interface of a general request / response format instead of the INVITE message described in the embodiment of FIG. 3. Next, the image server 200 queries the database to query the image to be attached to the subscriber (S204).

Next, the image server 200 that has completed the image inquiry in step S204 transmits the inquired image information to the SIP server 100 as a response message to the image request message received from the SIP server 100 (S205). .

The SIP server 100 receiving the image information as described above generates an image message including the corresponding image information (S206), and receives the INVITE message including the image message in the session establishment request message received from the initial originating terminal. Transmission to the terminal (S207).

That is, in the embodiment of FIG. 3, the SIP server 100 forwards the session establishment request message transmitted by the calling terminal to the image server 200, and after the image server 200 includes the corresponding image, the SIP server 100 again. In the embodiment of FIG. 4, when the SIP server 100 requests an image of the subscriber to the image server 200 through an interface of a general request / response format, the image server 200 transmits the corresponding image file. Is transmitted to the SIP server 100 and the SIP server 100 includes it in the session establishment request message to be transmitted to the called terminal.

Finally, Figure 5 is a call flow diagram illustrating a caller image display service method according to another embodiment of the present invention, a method of attaching and transmitting the image in the communication terminal.

As shown, when the calling subscriber manipulates his terminal at the time of the call attempt and attaches an image, the SIP client of the terminal includes the image information and transmits it to the SIP server 100 when the session establishment request message is generated ( S301).

Upon receiving the session establishment request message including the image information as described above, the SIP server 100 checks and authenticates whether the calling subscriber is subscribed (S302), and when the authentication is completed, transmits the received message to the called terminal. (S303) The image is displayed when a ring signal is transmitted to the called terminal.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all respects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Accordingly, the caller image display service system and method of the present invention has an effect that the caller can display an image designated by the caller through the screen of the called terminal at the time of call setup in a SIP-based wired or wireless communication service.

Claims (32)

A caller that designates an image to be transmitted to the called terminal when the call is attempted through a communication terminal having a SIP client function for establishing a call through the SIP protocol, and sends the image to the called terminal when the call is attempted by the calling subscriber. An image display service system, An image server storing image information designated for transmission by a calling subscriber to a called terminal; Storing the service usage information of the calling subscriber and receiving a session establishment request message from the communication terminal, determining whether the caller subscribes to the service and, in the case of a service subscriber, setting up a session including corresponding image information stored in the image server A SIP server for transmitting a request message to a called terminal; Caller image display service system using the SIP protocol, characterized in that comprises a. The method of claim 1, The image server receives an image request message from a SIP server, inquires an image corresponding to a sender, generates an image message including image information in the received message, and transmits the image message to the SIP server, wherein the SIP server is a called terminal. Caller image display service system using the SIP protocol, characterized in that for transmitting the session establishment request message containing the image message. The method of claim 1, The image server receives an image request message from a SIP server, inquires an image corresponding to a caller, and transmits the image to the SIP server, wherein the SIP server generates an image message including image information received from the image server. Caller image display service system using the SIP protocol, characterized in that for transmitting a session establishment request message comprising the same to the destination terminal. The method of claim 1, The image server stores at least one image information for each subscriber, When the SIP server receives a session establishment request message including an identifier parameter for designating any one of the at least one image from the originating terminal, the SIP server determines whether the caller subscribes to the service and stores the image stored in the image server when the subscriber is a service subscriber. Caller image display service system using the SIP protocol, characterized in that for transmitting to the destination terminal a session establishment request message including image information corresponding to the identifier parameter. The method of claim 1, The image server stores at least one image information for each calling number for one calling subscriber, When the SIP server receives the session establishment request message from the originating terminal, the SIP server transmits a session establishment request message including image information corresponding to the called party's originating number to the called terminal. Caller Image Display Service System. The method of claim 1, When the SIP server receives a session establishment request message including an identifier parameter for determining whether to display an image from the calling terminal, the SIP server determines whether to include image information according to the identifier parameter. Image display service system. The method of claim 1, Any one of the SIP server and the image server, the caller image display service system using the SIP protocol, characterized in that for measuring the size of the image to be transmitted according to the charge. The method of claim 1, The SIP server, the caller image display service system using the SIP protocol, characterized in that for transmitting a session establishment request message including the stored image information to the destination terminal via the TCP protocol. A communication terminal having a SIP client function for establishing a call through a SIP protocol, An image storage unit for storing image information; And a message generating unit for generating a session establishment request message including the image information when the user attempts to make a call using his terminal. The method of claim 9, The image storage unit stores at least one image information, The message generator, when the user manipulates his terminal to select any one of the images stored in the image storage unit and attempts to call, the communication terminal, characterized in that for generating a session establishment request message including the image information . The method of claim 10, The session establishment request message includes an identifier parameter corresponding to the selected image. The method of claim 9, The message generating unit, when the user operates the terminal to select whether to transmit the image and attempts to call, the communication terminal, characterized in that for generating a session establishment request message according to whether the image information included. The method of claim 9, The image storage unit stores at least one image information for each called number; The message generator, when the user attempts to call using the terminal, the communication terminal, characterized in that for generating a session establishment request message including the image information for the called number. A communication terminal having a SIP client function for establishing a call over the SIP protocol, and having a message storing unit for storing an image and generating a session establishment request message including image information; Upon receiving the session establishment request message including the image information from the terminal, confirming whether the caller subscribes to the service and transmitting the session establishment request message including the image information to the called terminal so that the image is displayed on the called terminal. SIP server; Caller image display service system using the SIP protocol, characterized in that made. The method of claim 14, The SIP server measures the size of the image to be transmitted, and performs charging accordingly according to the caller image display service system using the SIP protocol. The method of claim 14, The SIP server, the caller image display service system using the SIP protocol, characterized in that for transmitting a session establishment request message including the stored image information to the destination terminal via the TCP protocol. A session establishment request including a communication terminal having a SIP client function for establishing a call through the SIP protocol, an image server storing image information designated by a calling subscriber for transmission to a called terminal, and corresponding image information stored in the image server. A caller image display service method of a caller image display service system comprising a SIP server for transmitting a message to a called terminal, Receiving, by the SIP server, a session establishment request message according to a call attempt from the communication terminal, and confirming and authenticating whether the calling subscriber uses the service; When the authentication is completed, transmitting, by the SIP server, an image request message requesting a corresponding image of the calling subscriber to the image server; A third step of the image server querying the corresponding image information of the calling subscriber, generating an image message including the corresponding image information in the received image request message, and transmitting the image message to the SIP server; Transmitting, by the SIP server, a session establishment request message including the received image message to a called terminal; Caller image display service method using the SIP protocol, characterized in that comprises a. The method of claim 17, The image server stores at least one image information for each subscriber, In the first step, the SIP server receives a session establishment request message including an image identification parameter from the communication terminal, In the third step, the image server generates a caller image display service using the SIP protocol, characterized in that for generating an image message including the image information for the image identification parameter. The method of claim 17, The image server stores at least one image information for each calling number for one calling subscriber, In the second step, the SIP server sends an image request message including a called number to the image server, In the third step, the image server is a caller image display service method using the SIP protocol, characterized in that for querying the image information of the called party number of the calling subscriber and generating an image message including the same. The method of claim 17, In the first step, the SIP server receives a session establishment request message including an identifier parameter for determining whether to display an image from the communication terminal, In the second step, the SIP server, if the identifier parameter is a parameter for displaying the image, sender image display using the SIP protocol, characterized in that for transmitting the image request message requesting the corresponding image of the calling subscriber to the image server Service method. The method of claim 17, Caller image display service method using the SIP protocol, And measuring the size of an image to be transmitted by the image server and performing charging accordingly. The method of claim 17, Caller image display service method using the SIP protocol, And measuring the size of an image to be transmitted by the SIP server and performing charging accordingly. A session establishment request including a communication terminal having a SIP client function for establishing a call through the SIP protocol, an image server storing image information designated by a calling subscriber for transmission to a called terminal, and corresponding image information stored in the image server. A caller image display service method of a caller image display service system comprising a SIP server for transmitting a message to a called terminal, Receiving, by the SIP server, a session establishment request message according to a call attempt from the communication terminal, and confirming and authenticating whether the calling subscriber uses the service; When the authentication is completed, transmitting, by the SIP server, an image request message requesting a corresponding image of the calling subscriber to the image server; A third step of the image server querying the corresponding image information of the calling subscriber and transmitting the corresponding image information to the SIP server; A fourth step of the SIP server generating an image message including the received image information and transmitting a session establishment setting request message including the received image information to a called terminal; Caller image display service method using the SIP protocol, characterized in that comprises a. The method of claim 23, wherein The image server stores at least one image information for each subscriber, In the first step, the SIP server receives a session establishment request message including an image identification parameter from the communication terminal, In the third step, the image server is a caller image display service method using the SIP protocol, characterized in that for transmitting the image information on the image identification parameter to the SIP server. The method of claim 23, wherein The image server stores at least one image information for each calling number for one calling subscriber, In the second step, the SIP server sends an image request message including a called number to the image server, In the third step, the image server query image information for the called party number of the calling party and transmits the image information to the SIP server, characterized in that the caller image display service method using the SIP protocol. The method of claim 23, wherein In the first step, the SIP server receives a session establishment request message including an identifier parameter for determining whether to display an image from the communication terminal, In the second step, when the identifier parameter is a parameter for displaying an image, the SIP server transmits an image request message for requesting a corresponding image of the calling subscriber to the image server. Service method. The method of claim 23, wherein After the third step, The image server further comprises the step of measuring the size of the image to be transmitted and performing the charging according to the caller image display service method using the SIP protocol. The method of claim 23, wherein After the third step, The SIP server further comprises the step of measuring the size of the image to be transmitted and performing the charging according to the caller image display service method using the SIP protocol. A communication terminal having a SIP client function for establishing a call over the SIP protocol, the communication terminal including an image storage unit for storing image information and a message generation unit for generating a session establishment request message including the image information; A caller image display service method of a caller image display service system comprising a SIP server for transmitting a session establishment request message including the image information to a called terminal, A first step of generating, by the message generator, a session establishment request message including the image information when a user attaches an image stored in the image storage unit and attempts to make a call; Receiving, by the SIP server, a session establishment request message including image information from the communication terminal, and confirming and authenticating whether the calling subscriber uses the service; When the authentication is completed, transmitting, by the SIP server, a session establishment setting request message including the received image information to a called terminal; Caller image display service method using the SIP protocol, characterized in that comprises a. The method of claim 29, The image storage unit stores at least one image information, In the first step, the message generating unit generates a session establishment request message including the corresponding image information when the user manipulates his terminal to select any one of the images stored in the image storage unit and attempts a call. Caller image display service method using the SIP protocol characterized in that. The method of claim 29, The image storage unit stores at least one image information for each called number; In the first step, when the user attempts to make a call using his terminal, the caller image using the SIP protocol generates a session establishment request message including image information on the called party number. Indication service method. The method of claim 29, Caller image display service method using the SIP protocol, And measuring the size of an image to be transmitted by the SIP server and performing charging accordingly.