WO2012037799A1

WO2012037799A1 - Digital television reception terminal and method enabling multimedia instant messaging therefor

Info

Publication number: WO2012037799A1
Application number: PCT/CN2011/071395
Authority: WO
Inventors: 夏志毅
Original assignee: 深圳市同洲电子股份有限公司
Priority date: 2010-09-26
Filing date: 2011-02-28
Publication date: 2012-03-29
Also published as: CN101951381A

Abstract

A digital television reception terminal and a method enabling multimedia instant messaging therefor are implemented based on an Internet Protocol Multimedia Subsystem (IMS) network, and enable the digital television reception terminal to perform multimedia instant messaging conveniently and quickly with other communication devices with different service applications, which facilitates establishment of virtual community based on real user information and allows more convenient information exchange between digital television reception terminal users and between a digital television reception terminal and other communication devices. Meanwhile, during more efficient usage of resources in the radio film and television network in which the digital television reception terminal is located, integration of the radio film and broadcast network, the Internet and the mobile Internet is promoted by means of the IMS network, and the digital television reception terminal user viscosity and the value of the Average Revenue Per User (ARPU) of the radio film and broadcast network are improved.

Description

Digital television receiving terminal and method for realizing multimedia instant communication

This application claims priority to Chinese Patent Application No. 201010295187.4, entitled "Digital Television Receiving Terminal and Method for Realizing Multimedia Instant Messaging", filed on September 26, 2010, the entire contents of which are incorporated by reference. Combined in this application.

Technical field

The present invention relates to the field of multimedia communication technologies, and in particular, to a digital television receiving terminal and a method for realizing multimedia instant communication.

Background technique

The multimedia instant messaging in the prior art is mainly applied to personal computers (PCs, Personal Computers) and smart mobile terminal devices, such as audio calls, video calls, and text chats between PCs and PCs.

At present, all kinds of instant messaging use their own proprietary protocols, which are difficult to interconnect. For example, when using PC for text chat, if the chat objects exist in the communication list of two client softwares respectively, it needs to be in the PC. The two different client softwares are run simultaneously, and the current state of the object to be chatted, such as whether it is online, whether it can receive the transmitted file, etc., is obtained through the operation rules specific to each client software.

It can be seen that the current multimedia instant messaging has less devices to be applied on the one hand, and on the other hand, embedded devices with limited hardware resources, such as set-top boxes, which run more client software at the same time, consume more resources and operate. Very cumbersome.

Summary of the invention

The invention provides a digital television receiving terminal, which is based on an Internet Protocol Multimedia Subsystem (IMS) network and conveniently performs multimedia instant communication with other communication devices accessing the IMS network.

The invention provides a method for realizing multimedia instant communication by the above digital television receiving terminal. The method is implemented based on an IMS network, so that the digital television receiving terminal and other communication devices accessing the IMS network can conveniently perform multimedia instant communication.

The technical solution of the present invention is implemented as follows:

A digital television receiving terminal for realizing multimedia instant messaging, the key is that the digital television receiving terminal accesses an Internet Protocol Multimedia Subsystem (IMS) network; the digital television receiving terminal comprises: a subscription module, configured to subscribe to an IMS network server for status of other communication devices accessing the IMS network, to form a subscription list;

a status obtaining module, configured to receive a current status of the subscribed communication device notified by the IMS network server, and update the subscription list;

The multimedia communication module is configured to select a communication device whose current state is a communicable state from the subscription list for multimedia communication.

A method for implementing multimedia instant messaging by the above-mentioned digital television receiving terminal, the key is that the digital television receiving terminal accesses the Internet Protocol Multimedia Subsystem IMS network, subscribes to the IMS network server for the status of other communication devices accessing the IMS network, and forms a subscription list. The method further includes: the IMS network server notifying the digital television receiving terminal of the current state of the subscribed communication device, and the digital television receiving terminal updating the subscription list;

The digital television receiving terminal selects a communication device whose current state is a communicable state from the subscription list for multimedia communication.

It can be seen that the digital television receiving terminal provided by the present invention and the multimedia instant messaging method thereof are based on the IMS network. Since the IMS network has an open interface, it can access various service applications very conveniently and quickly, such as Internet service and mobile network. Business and digital TV services, etc., are equivalent to providing an open multimedia instant messaging platform. The digital television receiving terminal accesses the IMS network through the broadcasting network in which it is located, and the communication devices that access the IMS network perform operations according to the technical solution of the present invention, that is, the multimedia instant communication can be conveniently performed based on the unified standard, without having to follow more A proprietary protocol, the other communication devices herein may be digital television receiving terminals, PCs or mobile terminals. This will facilitate the establishment of a virtual community based on real user information, enabling digital TV to receive convenient information exchange between end users. On the other hand, while more effectively utilizing the radio and television network resources where the digital TV receiving terminal is located, the IMS network is utilized. It promotes the integration of the broadcasting network with the Internet and the mobile Internet, and improves the viscosity of the digital TV receiving terminal users. Based on this, it can also increase the average revenue per user (ARPU, Average Revenue Per User) value.

DRAWINGS

1 is a flow chart of a method for implementing multimedia instant messaging by a digital television receiving terminal according to the present invention; FIG. 2 is a flowchart of a release process according to an embodiment of the present invention;

3 is a flow chart of subscription in an embodiment of the present invention; 4 is a flow chart of communication in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a digital television receiving terminal according to the present invention.

detailed description

In order to make the objects and advantages of the present invention more comprehensible, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Before introducing the embodiment, the content of the IMS network will be briefly described.

The IMS network, which is the core standard framework of the Next Generation Network (NGN), is based on the Session Initiation Protocol (SIP) and is a system that combines data, voice, mobile and fixed networks.

The Call Session Control Function (CSCF) is the core functional entity of the IMS network. It is responsible for forwarding SIP messages and forming a routing system between the client and the server and between the clients. The CSCF can be divided into a proxy call session control function entity (P-CSCF), a serving call session control function entity (S-CSCF), and an inquiry call session control function entity (I-CSCF), wherein the P-CSCF is located in the access network. It is the entry point for accessing the IMS network, and is responsible for accepting user access, SIP message forwarding, integrity protection, and compression processing. The I-CSCF is located in the home network and is the entry point for the SIP message to enter the IMS network. It is mainly responsible for querying the home network server (HSS, Home Subscriber Server) to select the S-CSCF for the user and sending the relevant SIP message to the S-CSCF. The S-CSCF is located in the home network and mainly accepts user registration, downloads and temporarily stores user information from the HSS, redirects routes, performs call session control, triggers user subscription services, and cooperates with the service platform for service support.

In the present invention, the digital television receiving terminal subscribes to the IMS network server for the current state of the other communication device accessing the IMS network, forming a subscription list including the communication device and its corresponding state. The current status here refers to whether the communication device is currently communicable, such as online, offline, etc., and each state can be set with a corresponding preset identifier. The digital TV receiving terminal accesses the IMS network through its broadcasting network.

1 is a flow chart of a method for implementing multimedia instant messaging by a digital television receiving terminal according to the present invention, and the process includes:

Step 101: The IMS network server notifies the digital television receiving terminal of the current status of other communication devices that the terminal has subscribed to, and the digital television receiving terminal updates the subscription list. In this step, when the IMS network server notifies, it can only notify the preset identifier corresponding to the current state of the other communication device that has been subscribed, and the digital television receiving terminal can know the current state by using the preset identifier.

Step 102: The digital television receiving terminal selects another communication device whose current state is communicable from the subscription list for multimedia communication.

In the present invention, the digital television receiving terminal provides an application interface, and is displayed by a display device connected to the digital television receiving terminal or a display device connected to the digital television receiving terminal, and the user can click the corresponding option on the application interface. Perform a variety of different operations, such as browsing the subscription list through the application interface, or selecting the currently communicating communication device.

It can be seen that the digital television receiving terminal provided by the present invention and the multimedia instant messaging method thereof are based on the IMS network. Since the IMS network has an open interface, it can access various service applications very conveniently and quickly, such as Internet service and mobile network. Business and digital TV services, etc., are equivalent to providing an open multimedia instant messaging platform. The digital television receiving terminal accesses the IMS network, and the communication devices that access the IMS network perform operations according to the technical solution of the present invention, that is, the multimedia instant communication can be conveniently performed based on the unified standard, without following the corresponding multiple private protocols. Other communication devices herein may be digital television receiving terminals, PCs or mobile terminals. This will facilitate the establishment of a virtual community based on real user information, enabling digital TV to receive more convenient information exchange between end users. On the other hand, while more effectively utilizing the radio and television network resources where the digital TV receiving terminal is located, with the help of IMS The network promotes the integration of the broadcasting network with the Internet and the mobile Internet, and improves the viscosity of the digital TV receiving terminal users. Based on this, the ARPU value of the broadcasting network can also be improved.

An embodiment of a method for realizing multimedia instant messaging by a digital television receiving terminal in the present invention is given below. The digital television receiving terminal may be a set top box, or a digital television integrated machine, or a network protocol television.

In this embodiment, it is assumed that both parties performing multimedia instant messaging are a set top box and a PC. This embodiment includes three parts: the subscription process, the release process, and the communication process.

2 is a flowchart of a release process in an embodiment of the present invention. Taking the release of a PC as an example, the process shown in FIG. 2 includes:

Step 201: The PC sends a release signaling (PUBLISH) to the P-CSCF of the access network where the PC is in the status update state, where the release signaling carries the identity and current status of the PC. In this step, the issuing signaling is standard SIP signaling, and the identity and current state of the PC are carried in the issuing signaling according to the specified format.

Step 202: The P-CSCF of the visited network where the PC is located searches the S-CSCF of the home network of the PC in the HSS according to the identity of the PC, and forwards the release signaling to the found S-CSCF.

Step 203: The S-CSCF of the home network of the PC forwards the release signaling to the IMS network server.

Step 204: The IMS network server performs authentication, specifically, whether the identity of the PC exists in the HSS. If yes, the S-CSCF of the home network of the PC and the P-CSCF of the visited network where the PC is located are returned to the PC to indicate that the advertisement is successfully issued. Confirmation signaling (200 OK).

Similarly, when the status box is updated, the set-top box and other types of communication devices can also release the updated current status to the IMS network server through the above steps 201-204.

FIG. 3 is a flow chart of a subscription in the first embodiment of the present invention. Taking the subscription of the set top box as an example, the process shown in FIG. 3 includes:

Step 301: The set-top box sends a subscription signaling (SUBSCRIBE) to the P-CSCF of the visited network, where the subscription signaling carries the identity of the set-top box and the identity of the PC.

In this step, the subscription signaling is standard SIP signaling, and the identity of the set top box and the identity of the PC are carried in the subscription signaling according to the specified format.

Step 302: The P-CSCF of the visited network where the set-top box is located searches the S-CSCF of the home network of the set-top box in the HSS according to the identity of the set-top box, and forwards the subscription signaling to the found S-CSCF.

Step 303: The S-CSCF of the home network of the set top box forwards the subscription signaling to the IMS network server.

Step 306: The IMS network server performs authentication, specifically, according to the identity of the set-top box, querying the viewable user list corresponding to the identity of the set-top box, determining whether the identity of the PC is in the viewable user list, and if present, the IMS network server Confirming that the set-top box has the subscription right, and sequentially returns the confirmation signaling (200 OK) indicating the subscription success to the set-top box through the S-CSCF of the home network of the set-top box and the P-CSCF of the access network; otherwise, sending an inquiry to the PC according to the identity of the PC Signaling, asking whether the PC is allowed to be subscribed by the set-top box, and the inquiry signaling carries the identity of the set-top box. If the PC returns the permission confirmation, the IMS network server determines that the set-top box has the subscription right, and sequentially passes through the S-CSCF of the home network of the set-top box and the access network. The P-CSCF returns to the set-top box indicating that the subscription was successful. Confirmation signaling (200 OK) ₀

In this step, the IMS network server maintains a corresponding viewable user list for each communication device accessing the IMS network, and the list includes the identity of all communication devices that the communication device can subscribe to. When the communication device subscribes to some other communication device for the first time, the corresponding viewable user list does not include the identity of the communication device to be subscribed, and the IMS network server confirms the communication to be subscribed by the above inquiry. Whether the device is allowed to be subscribed, if allowed, the identity of the communication device to be subscribed to is added to the list of viewable users of the subscriber communication device. When the communication device needs to subscribe to the communication device, the viewable user list already contains the identity of the communication device to be subscribed, and the IMS network server does not need to query the communication device to be subscribed again.

After the PC issues the status to the server according to the process shown in Figure 2, the server will send a notification to the set-top box of the subscribed PC, including the following steps:

Step 305: The IMS network server sends a notification signaling ( NOTIFY) to the set-top box through the S-CSCF of the home network of the set-top box and the P-CSCF of the access network, where the notification signaling carries current status information of the PC.

In this step, the notification signaling is standard SIP signaling, and the current state information of the PC is carried in the notification signaling according to the standard format.

After the set top box parses the current state information of the PC from the notification signaling, it updates the current state of the PC in the subscription list.

Step 306: The set-top box sequentially returns the determination signaling (200 OK) indicating that the reception is successful to the server through the P-CSCF of the access network and the S-CSCF of the home network.

Similarly, the PC can also subscribe to the state of the set top box according to steps 301 to 304, and obtain the status information of the set top box according to steps 305 to 306.

FIG. 4 is a flow chart of the communication in the embodiment of the present invention. The process shown in FIG. 4 is as follows:

Step 401: The set-top box sends an invitation signaling (INVITE) to the P-CSCF of the visited network, where the invitation signaling carries the identity of the set-top box and the identity of the PC.

When the set-top box learns that the current state of the PC is online through the process shown in FIG. 3, the PC can be selected from the subscription list for multimedia instant messaging. In this step, the signaling of the invitation is the Session Description Protocol (SDP) signaling, and the identification of the set top box and the PC is performed. It is carried in the invitation signaling according to the prescribed format.

Step 402: The P-CSCF of the access network where the set-top box is located searches the S-CSCF of the home network of the set-top box in the HSS according to the identity of the set-top box, and forwards the invitation signaling to the found S-CSCF.

Step 403: The S-CSCF of the home network of the set top box forwards the invitation signaling to the I-CSCF of the home network.

Step 404: The I-CSCF of the home network of the set top box searches the S-CSCF of the home network of the PC in the HSS according to the identity of the PC, and forwards the invitation signaling to the found S-CSCF.

Step 405: The S-CSCF of the home network of the PC forwards the invite signaling to the P-CSCF of the visited network where the PC is located.

Step 406: The P-CSCF of the visited network where the PC is located forwards the invitation signaling to the PC.

In this step, the S-CSCF of the home network of the PC may also send the attempt signaling, which is sent to the set-top box through the I-CSCF, the S-CSCF of the home network of the set-top box, and the P-CSCF of the visited network, where the set-top box is This can be known that the communication initiated by itself is being tried.

Step 407: The PC sequentially sends a ringing signal to the set top box through the P-CSCF of the visited network, the S-CSCF of the home network, the I-CSCF and the S-CSCF of the home network of the set top box, and the P-CSCF of the access network where the set top box is located. ( Ringing ).

This step is optional. In some application scenarios, the ring signal may not be sent.

Step 408: The PC sequentially sends an instruction to accept the invitation to the set-top box through the P-CSCF of the visited network, the S-CSCF of the home network, the I-CSCF and the S-CSCF of the home network of the set-top box, and the P-CSCF of the access network where the set-top box is located. Confirmation signaling (200 OK).

Step 409: The set-top box sends an acknowledgement (ACK) signaling to the PC through the P-CSCF of the visited network, the S-CSCF of the home network, the I-CSCF, and the S-CSCF of the home network where the PC is located.

Step 410: The set top box and the PC perform a multimedia data session.

When you need to end a multimedia data session, perform the following two steps:

Step 411: The PC sends a goodbye signaling (BYE) to the set top box.

Step 412: The set top box sends an acknowledgment signaling (200 OK) indicating that the reception is successful to the PC, and the multimedia data session ends.

Through the description in the above embodiment, a real identity based between the set top box and the PC is established. Similar to multimedia instant messaging, the set-top box can also conveniently carry out multimedia instant messaging with the mobile terminal. Through the present embodiment, the current huge set-top box user resources are quickly integrated into the relatively mature Internet or mobile Internet by means of the IMS network, and the virtual community information communication platform corresponding to the real community is established by using the good scalability of the IMS network. The virtual community can provide a variety of community services, such as community information release, community dating and community interactive entertainment, to promote communication. In the future, based on the characteristics of the IMS network, it can also be connected to the Internet-based or mobile Internet-related systems. On the other hand, the viscosity of the set-top box user is increased, and based on this, the ARPU value of the radio and television network where the set-top box is located can also be increased.

The digital television receiving terminal in the present invention will be described below.

FIG. 5 is a schematic structural diagram of a digital television receiving terminal according to the present invention. The digital television receiving terminal is connected to an IMS network, and the digital television receiving terminal comprises: a subscription module, a state acquiring module, and a multimedia communication module.

The subscription module subscribes to the IMS network server for the status of other communication devices accessing the IMS network to form a subscription list.

The status obtaining module is configured to receive a current status of the subscribed other communication device notified by the IMS network server, and update its own subscription list.

The multimedia communication module is configured to select, from the subscription list, a communication device whose current state is communicable for multimedia communication.

Further, in order to perform various operations in the method embodiments of the present invention, an implementation manner of the internal structure of the subscription module, the state acquisition module, and the multimedia communication module is exemplified.

The above subscription module includes: a subscription sending unit and a subscription receiving unit. The subscription sending unit is configured to send the subscription signaling to the IMS network server, where the subscription signaling carries the identity of the digital television receiving terminal and the identity of the communication device to be subscribed; the subscription receiving unit is configured to receive the IMS network server. The returned determination signaling indicating the success of the subscription.

The state acquiring module includes: a state receiving unit, a parsing unit, and an updating unit. The status receiving unit is configured to receive the notification signaling sent by the IMS network server, where the notification signaling carries the identity identifier and the current state information of the subscribed communication device, and the parsing unit receives the notification signaling from the receiving unit. Parsing the current state of the subscribed communication device; updating the unit, updating the subscription list by using the current state parsed by the parsing unit. The above multimedia communication module includes: an invitation unit and a communication execution unit. The invitation unit is configured to select, from the subscription list, a communication device whose current state is online, and send the invitation signaling, where the invitation signaling carries the identity of the digital television receiving terminal and the identity of the selected communication device; The indication sent by the selected communication device accepts the invitation confirmation signaling; the communication execution unit is configured to send the acknowledgement response signaling, and start a multimedia data session with the selected communication device. The invitation unit may be further configured to receive a ringing signal sent by the selected communication device. The communication execution unit may be further configured to: receive the goodwill signaling sent by the selected communication device, return an acknowledgement signaling to the selected communication device, and end the current multimedia data session.

Further, when the communication device of the digital television receiving terminal shown in FIG. 5 is updated, the updated state needs to be released to the IMS network server. To achieve the purpose, the digital television receiving terminal further includes: a status publishing module, And sending the release signaling to the IMS network server, where the release signaling carries the identity identifier and current state information of the digital television receiving terminal.

The digital television receiving terminal has been widely used in the community at present, and the digital television receiving terminal provided by the present invention can perform multimedia instant communication with other communication devices, such as a PC and a mobile terminal, based on the IMS network, which is advantageous for establishing virtual reality based on real user information. The community enables digital TV to receive more convenient information exchange between end users. On the other hand, while more effectively utilizing the radio and television network resources where the digital TV receiving terminal is located, the IMS network promotes the broadcasting network and the Internet and the mobile Internet. The triple play and the viscosity of the digital TV receiving terminal users are improved, and based on this, the ARPU value of the broadcasting and television network can be improved.

In conclusion, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

A digital television receiving terminal for realizing multimedia instant messaging, wherein the digital television receiving terminal accesses an Internet Protocol Multimedia Subsystem IMS network; the digital television receiving terminal comprises:

a subscription module, configured to subscribe to an IMS network server for status of other communication devices accessing the IMS network, to form a subscription list;

2. The digital television receiving terminal according to claim 1, wherein the subscription module comprises: a subscription sending unit and a subscription receiving unit;

The subscription sending unit is configured to send a subscription signaling to the IMS network server, where the subscription signaling carries an identity of the digital television receiving terminal and an identity of the communication device to be subscribed; the subscription receiving unit is configured to receive The acknowledgment signal returned by the IMS network server indicating the success of the subscription.

The digital television receiving terminal according to claim 2, wherein the state acquiring module comprises: a state receiving unit, a parsing unit, and an updating unit;

The status receiving unit is configured to receive the notification signaling sent by the IMS network server, where the notification signaling carries the identity identifier of the subscribed communication device and current state information.

The parsing unit is configured to parse a current status of the subscribed communication device from the notification signaling received by the status receiving unit;

The updating unit is configured to update a subscription list by using a current state of the subscribed communication device parsed by the parsing unit.

The digital television receiving terminal according to claim 1, wherein the multimedia communication module comprises: an invitation unit and a communication execution unit;

The inviting unit is configured to select, from the subscription list, a communication device whose current state is an online state, and send the invitation signaling, where the invitation signaling carries the identity of the digital television receiving terminal and the identity of the selected communication device. Receiving the instruction sent by the selected communication device to accept the invitation Signaling

The communication execution unit is configured to send an acknowledgement response signaling and perform a multimedia data session with the selected communication device.

The digital television receiving terminal according to claim 4, wherein the inviting unit is further configured to receive a ringing signal sent by the selected communication device.

The digital television receiving terminal according to claim 4, wherein the communication executing unit is further configured to: receive the goodwill signaling sent by the selected communication device, and return an acknowledgement signaling to the selected communication device, End the current multimedia data session.

The digital television receiving terminal according to claim 1, wherein the digital television receiving terminal further comprises: a status issuing module, configured to send, to the IMS network server, the issuing signaling, where the issuing signaling carries the number The identity of the television receiving terminal and current status information.

The digital television receiving terminal according to any one of claims 1 to 7, wherein the digital television receiving terminal is a set top box, or a network protocol television, or a digital television integrated machine.

9. A method for implementing multimedia instant messaging by a digital television receiving terminal according to claim 1, wherein the digital television receiving terminal accesses an Internet Protocol Multimedia Subsystem IMS network, and subscribes to the IMS network server for other access IMS networks. The status of the communication device, forming a subscription list; the method further includes:

The IMS network server notifies the digital television receiving terminal of the current status of the subscribed communication device, and the digital television receiving terminal updates the subscription list;

The method according to claim 9, wherein the step of requesting the status of the other communication device to form a subscription list to the IMS network server, specifically includes:

The digital television receiving terminal sends a subscription signaling to the IMS network server, where the subscription signaling carries the identity of the digital television receiving terminal and the identity of the communication device to be subscribed;

The IMS network server queries the viewable user list corresponding to the identity of the digital television receiving terminal, and if the identity of the communication device to be subscribed is included, determining that the digital television receiving terminal has the subscription right, and the digital television receiving terminal Returning the acknowledgment signaling indicating that the subscription is successful; otherwise, sending an inquiry signaling to the communication device to be subscribed, and asking whether the user equipment to be subscribed is allowed The digital television receiving terminal subscribes to the digital television receiving terminal, and the inquiry signaling carries the identity of the digital television receiving terminal. When the communication device to be subscribed returns the permission confirmation, the IMS network server determines that the digital television receiving terminal has the subscription right and is to subscribe. The identity of the communication device is added to the viewable user list, and an acknowledgement signaling indicating that the subscription is successful is returned to the digital television receiving terminal;

After returning the acknowledgment signaling, the digital television receiving terminal adds the identity of the communication device to be subscribed to its own subscription list.

The method of claim 9, wherein the IMS network server notifies the digital television receiving terminal of the current status of the subscribed communication device, specifically:

The IMS network server receives the release signaling sent by the communication device after the status update, where the release signaling carries the identity identifier of the communication device and the current state;

When the IMS network server queries the home subscriber server, the identity identifier of the communication device exists in the HSS, and returns an acknowledgement signaling indicating that the advertisement is successful to the communication device;

The IMS network server sends the notification signaling to the digital television receiving terminal, where the notification signaling carries the identity identifier of the communication device and its current state;

After receiving the notification signaling, the digital television receiving terminal returns an acknowledgment signaling indicating that the reception is successful to the IMS network server, and updates the current state information of the communication device in the subscription list.

The method of claim 9, wherein the digital television receiving terminal selects a step of the multimedia communication in the subscription list in the current state of the communication device, specifically comprising: the digital television receiving terminal from the subscription list of the digital television receiving terminal Select a communication device whose current status is communicable;

The digital television receiving terminal sends the invitation signaling, where the invitation signaling carries the identity identifier of the digital television receiving terminal, the selected identity identifier of the communication device, and the session parameter;

The digital television receiving terminal receives the confirmation signaling returned by the selected communication device to accept the invitation, and the session is established;

The digital television receiving terminal sends an acknowledgement response signaling;

The digital television receiving terminal starts a multimedia data session with the selected communication device according to the session parameter.

The method according to claim 12, wherein after receiving the invitation signaling, the digital television receiving terminal receives an acknowledgement signal indicating that the invitation is accepted by the selected communication device Before, further include:

The selected communication device sends a ringing signal.

The method of claim 12, wherein after the digital television receiving terminal starts the multimedia data session with the selected communication device, the method further includes the steps of:

The digital television receiving terminal receives the goodwill signaling sent by the selected communication device; the digital television receiving terminal returns an acknowledgment signaling to the selected communication device, and the multimedia data session ends.