CN102811336A - Method and apparatus for capability negotiation of multimedia - Google Patents

Abstract

The invention provides a multimedia capability negotiation method and device, belonging to the communication field. The multimedia capability negotiation method, which is applied in the MONA-MPC system, includes: the first terminal constructs a first priority PM message according to the priority of its own media capability; the first terminal sends the first PM message to the second terminal, and receive the second PM message returned by the second terminal, where the second PM message includes the first terminal determined by the second terminal according to the priority of the media capability of the first terminal and the first The media capability used by the terminal for communication; the first terminal determines a media channel for communication with the second terminal according to the second PM message. The invention can improve the versatility of the MPC.

Description

Multimedia capability negotiation method and device

technical field

The invention relates to the communication field, in particular to a multimedia capability negotiation method and device.

Background technique

Videophone is a multimedia communication system that integrates audio and video, so that people are no longer limited to ordinary voice telephone services, and truly realize the dream of hearing their voices and seeing them. With the advent of the 3G era, videophones will be accepted by more and more people.

Most of the 3G video calls are based on the 3G-H.324M video call standard. The normal H.245 call process takes more than 5 to 8 seconds, which is difficult for users to accept. Therefore, a protocol to speed up the H.245 process has emerged MONA (media oriented negotiation acceleration, media-oriented negotiation acceleration) can shorten the call setup time of H.245 to within one second.

There are three technologies in the MONA specification, namely SPC (Signaling Preconfigured Channel, signaling preconfigured channel), MPC (Media Preconfigured Channels, media preconfigured channel), ACP (Accelerated Connection Procedure, accelerated connection process), among which MPC has the fastest negotiation speed , but the existing MPC technology has the following disadvantages: it cannot express the attributes of media capabilities, so in the case of multiple media capabilities, MPC cannot express the priority of multiple media capabilities, which may lead to negotiation failure and reduce the MPC. Versatility.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multimedia capability negotiation method and device, which can improve the versatility of MPC.

In order to solve the above technical problems, embodiments of the present invention provide technical solutions as follows:

On the one hand, a multimedia capability negotiation method is provided, which is applied to the media-oriented negotiation acceleration-media pre-configured channel MONA-MPC system, including:

The first terminal constructs a first priority PM message according to the priority of its own media capabilities;

The first terminal sends the first PM message to the second terminal, and receives a second PM message returned by the second terminal, where the second PM message includes the second terminal according to the first terminal The media capability used for communication with the first terminal determined by the priority of the media capability;

The first terminal determines a media channel for communicating with the second terminal according to the second PM message.

Wherein, the first PM message carries the priority of the media capability of the first terminal, and the priority of the media capability includes the priority of the receiving media capability and the priority of sending the media capability of the first terminal.

Wherein, the second PM message includes the sending media capability and receiving media capability of the second terminal, and the first terminal determines the media channel for communicating with the second terminal according to the second PM message includes:

The first terminal judges whether it has a media sending capability consistent with the media receiving capability of the second terminal, and whether it has a media receiving capability consistent with the media sending capability of the second terminal;

When the first terminal has a media sending capability consistent with the media receiving capability of the second terminal, and has a media receiving capability consistent with the media sending capability of the second terminal, the first terminal pre-configures the media A channel communicates with the second terminal.

The embodiment of the present invention also provides a multimedia capability negotiation method, which is applied to the media-oriented negotiation acceleration-media preconfigured channel MONA-MPC system, including:

The second terminal receives a first priority PM message sent by the first terminal, where the first PM message carries the priority of the media capability of the first terminal;

The second terminal determines the media capability used by itself for communicating with the first terminal according to the priority of the media capability of the first terminal;

The second terminal sends the determined media capability to the first terminal through a second PM message, so that the first terminal determines a media channel for communicating with the second terminal.

Wherein, the priority of the media capability of the first terminal includes the priority of receiving media capability and the priority of sending media capability of the first terminal, and the second terminal determines according to the priority of the media capability of the first terminal The media capabilities used by itself to communicate with the first terminal include:

The second terminal determines the sending media capability used by itself for communicating with the first terminal according to the priority of the receiving media capability of the first terminal;

The second terminal determines the receiving media capability used by itself for communicating with the first terminal according to the priority of the sending media capability of the first terminal.

The embodiment of the present invention also provides a multimedia capability negotiation device, which is applied in the media-oriented negotiation acceleration-media preconfigured channel MONA-MPC system, including:

A first construction module, configured to construct a first priority PM message according to the priority of the media capability of the first terminal;

A first interface module, configured to send the first PM message to a second terminal, and receive a second PM message returned by the second terminal, where the second PM message includes the second terminal according to the second terminal. The media capability used by a terminal for communicating with the first terminal determined by the priority of the media capability of the terminal;

A first processing module, configured to determine a media channel through which the first terminal communicates with the second terminal according to the second PM message.

Wherein, the first construction module is specifically configured to fill the priority of the media capability of the first terminal into the first PM message, and the priority of the media capability includes the receiving media capability of the first terminal priority and the priority of the ability to send media.

Wherein, the second PM message includes the sending media capability and receiving media capability of the second terminal, and the first processing module includes:

a judging unit, configured to judge whether the first terminal has a media sending capability consistent with the media receiving capability of the second terminal, and whether it has a media receiving capability consistent with the media sending capability of the second terminal;

a processing unit, configured to determine the second terminal when the first terminal has a media transmission capability consistent with the media reception capability of the second terminal, and has a media reception capability consistent with the media transmission capability of the second terminal; A terminal communicates with the second terminal through a media pre-configured channel.

The embodiment of the present invention also provides a multimedia capability negotiation device, which is applied in the media-oriented negotiation acceleration-media preconfigured channel MONA-MPC system, including:

The second interface module is configured to receive a first priority PM message sent by the first terminal, where the first PM message carries the priority of the media capability of the first terminal;

A second processing module, configured to determine the media capability used by the second terminal to communicate with the first terminal according to the priority of the media capability of the first terminal;

A second construction module, configured to construct a second PM message according to the determined media capability of the second terminal;

The second interface module is further configured to send the second PM message to the first terminal, so that the first terminal determines a media channel for communicating with the second terminal.

Wherein, the priority of the media capability of the first terminal includes the priority of the receiving media capability and the priority of sending the media capability of the first terminal,

The second processing module is specifically configured to determine the sending media capability used by the second terminal to communicate with the first terminal according to the priority of the receiving media capability of the first terminal, and according to the sending media capability of the first terminal The priority of the media capability determines the receiving media capability used by the second terminal to communicate with the first terminal.

Embodiments of the present invention have the following beneficial effects:

In the above solution, the PM message sent by the first terminal to the second terminal carries the priority of the media capability of the first terminal, so that after receiving the PM message, the second terminal can, according to the priority of the media capability of the first terminal, The level determines the media capability used by itself to communicate with the first terminal, so as to ensure that the two sides of the communication can preferentially use the media capability with higher priority for negotiation, increase the negotiation success rate, and improve the versatility of the MPC.

Description of drawings

FIG. 1 is a schematic flowchart of a multimedia capability negotiation method according to an embodiment of the present invention;

FIG. 2 is another schematic flowchart of a multimedia capability negotiation method according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a multimedia capability negotiation device according to an embodiment of the present invention;

FIG. 4 is another schematic structural diagram of a multimedia capability negotiation device according to an embodiment of the present invention;

Fig. 5 is a schematic flow diagram of MONA-MPC session establishment in the prior art;

FIG. 6 is a schematic diagram of a session establishment process of a multimedia capability negotiation method according to an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The embodiment of the present invention aims at the problem in the prior art that MPC cannot express the priority of multiple media capabilities, resulting in negotiation failure and reducing the versatility of MPC, and provides a multimedia capability negotiation method and device, which can improve the versatility of MPC .

Fig. 1 is the schematic flow chart of the multimedia capability negotiation method of the embodiment of the present invention, as shown in Fig. 1, this embodiment is applied to MONA-MPC (media oriented negotiation acceleration-MediaPreconfigured Channels, media-oriented negotiation acceleration-media preconfigured channel) system, including:

Step 101: the first terminal constructs a first priority PM message according to the priority of its own media capabilities;

Step 102: The first terminal sends the first PM message to the second terminal, and receives the second PM message returned by the second terminal. The second PM message includes the second terminal's own information determined by the priority of the media capability of the first terminal. media capabilities used to communicate with the first terminal;

Step 103: the first terminal determines a media channel for communicating with the second terminal according to the second PM message.

In the multimedia capability negotiation method of the embodiment of the present invention, the PM message sent by the first terminal to the second terminal carries the priority of the media capability of the first terminal, so that after receiving the PM message, the second terminal can, according to the first The priority of the media capability of the terminal determines the media capability used for communication between itself and the first terminal, thus ensuring that the two parties in the communication can preferentially use the media capability with a higher priority for negotiation, increasing the success rate of negotiation and improving the universality of MPC. sex.

Fig. 2 is another schematic flow chart of the multimedia capability negotiation method of the embodiment of the present invention, as shown in Fig. 2, this embodiment is applied in the MONA-MPC system, including:

Step 201: the second terminal receives the first priority PM message sent by the first terminal, and the first PM message carries the priority of the media capability of the first terminal;

Step 202: the second terminal determines the media capability used for communication with the first terminal according to the priority of the media capability of the first terminal;

Step 203: the second terminal sends the determined media capability to the first terminal through a second PM message, so that the first terminal determines a media channel for communicating with the second terminal.

In the multimedia capability negotiation method of the embodiment of the present invention, the PM message sent by the first terminal to the second terminal carries the priority of the media capability of the first terminal, so that after receiving the PM message, the second terminal can, according to the first The priority of the media capability of the terminal determines the media capability used for communication between itself and the first terminal, thus ensuring that the two parties in the communication can preferentially use the media capability with a higher priority for negotiation, increasing the success rate of negotiation and improving the universality of MPC. sex.

FIG. 3 is a schematic structural diagram of a multimedia capability negotiation device according to an embodiment of the present invention. As shown in FIG. 3, this embodiment is applied to a MONA-MPC system, including:

The first construction module 30 is configured to construct a first priority PM message according to the priority of the media capability of the first terminal;

The first interface module 31 is configured to send the first PM message to the second terminal, and receive the second PM message returned by the second terminal, where the second PM message includes the second terminal according to the priority of the media capability of the first terminal. The determined media capability used by the self to communicate with the first terminal;

The first processing module 32 is configured to determine a media channel through which the first terminal communicates with the second terminal according to the second PM message.

Wherein, the first construction module 30 is specifically configured to fill the priority of the media capability of the first terminal into the first PM message, and the priority of the media capability includes the priority of the receiving media capability and the priority of sending the media capability of the first terminal. class.

Wherein, the second PM message includes the sending media capability and receiving media capability of the second terminal, and the first processing module 32 includes:

A judging unit, configured to judge whether the first terminal has a media sending capability consistent with the media receiving capability of the second terminal, and whether it has a media receiving capability consistent with the media sending capability of the second terminal;

A processing unit, configured to determine that the first terminal communicates with the media pre-configured channel when the first terminal has a media sending capability consistent with the media receiving capability of the second terminal, and has a media receiving capability consistent with the media sending capability of the second terminal. The second terminal communicates.

In the multimedia capability negotiation device of the embodiment of the present invention, the PM message sent by the first terminal to the second terminal carries the priority of the media capability of the first terminal, so that after receiving the PM message, the second terminal can, according to the first The priority of the media capability of the terminal determines the media capability used for communication between itself and the first terminal, thus ensuring that the two parties in the communication can preferentially use the media capability with a higher priority for negotiation, increasing the success rate of negotiation and improving the universality of MPC. sex.

FIG. 4 is another schematic structural diagram of a multimedia capability negotiation device according to an embodiment of the present invention. As shown in FIG. 4, this embodiment is applied to a MONA-MPC system, including:

The second interface module 40 is configured to receive a first priority PM message sent by the first terminal, where the first PM message carries the priority of the media capability of the first terminal;

The second processing module 41 is configured to determine the media capability used by the second terminal to communicate with the first terminal according to the priority of the media capability of the first terminal;

The second construction module 42 is configured to construct a second PM message according to the determined media capability of the second terminal;

The second interface module 40 is further configured to send a second PM message to the first terminal, so that the first terminal determines a media channel for communicating with the second terminal.

Wherein, the priority of the media capability of the first terminal includes the priority of the receiving media capability and the priority of sending the media capability of the first terminal,

The second processing module 41 is specifically configured to determine the sending media capability used by the second terminal to communicate with the first terminal according to the priority of the receiving media capability of the first terminal, and determine the second terminal according to the priority of the sending media capability of the first terminal The receiving media capability used for communicating with the first terminal.

In the multimedia capability negotiation device of the embodiment of the present invention, the PM message sent by the first terminal to the second terminal carries the priority of the media capability of the first terminal, so that after receiving the PM message, the second terminal can, according to the first The priority of the media capability of the terminal determines the media capability used for communication between itself and the first terminal, thus ensuring that the two parties in the communication can preferentially use the media capability with a higher priority for negotiation, increasing the success rate of negotiation and improving the universality of MPC. sex.

The multimedia capability negotiation method of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Figure 5 shows a schematic diagram of the MONA-MPC session establishment process in the prior art, including:

Step 501, the sender fills in and sends a PM initialization message to the receiver;

After the CS (Client/Server, client/server) link is established, the sender fills in and sends a PM initialization message to the receiver;

Step 502, if the sender supports and preferentially uses MPC, then send its own media data in the Payload field in the PM message, and the data format is represented by MUX code;

In this way, when the sender has multiple media capabilities, the receiver can know the media capabilities supported by the sender according to the media data, but cannot know the priority of each media capability;

Step 503, the sender receives the PM message of the receiver, and the PM message includes the sending media capability MPC-TX and the receiving media capability MPC-RX supported by the receiving party;

Step 504, if the MPC-RX of the sender is the same as the MPC-TX of the receiver, and the MPC-TX of the sender is the same as the MPC-RX of the receiver, it means that the sender and the receiver can communicate through the MPC.

For the receiver, analyze the received PDU (Protocol DataUnit, protocol data unit) of the pre-configured media channel, and compare whether the media data in it conforms to its own MPC-RX, if the data in the received PDU does not meet its own MPC -RX, all data is discarded. If it is satisfied, it will be decoded and displayed.

For the sender, after receiving the receiver's PM message, it can judge whether the pre-configured channel established by itself is correct according to the other party's MPC-RX. If it is wrong, it will stop sending and use the appropriate media channel to send.

When the terminal has multiple media capabilities, the MONA-MPC session establishment process in the prior art cannot indicate the media capability attribute, so when the terminal has multiple media capabilities, it cannot indicate the priority of the multiple media capabilities, so it cannot be guaranteed The terminals on both sides establish communication through the media capability with the highest priority, which may result in failure of media negotiation.

Figure 6 is a schematic diagram of the session establishment process of the multimedia capability negotiation method of the present invention. In this embodiment, it is not required that the called terminal can also indicate the media capability attribute in the PM message, but in order to improve the MPC versatility for both parties , The called terminal can also indicate the media capability attribute in the PM message, and the multimedia capability negotiation method of the present invention will be described below by taking the called terminal also can indicate the media capability attribute in the PM message as an example:

Step 601, the calling terminal creates a media priority table, and determines the codec symmetric attribute table and the priority of its own multiple media capabilities, including the priority of receiving media capabilities and the priority of sending media capabilities;

After the CS link is established, the calling terminal establishes a media priority table to determine the codec symmetric attribute table and the priority of its own multiple media capabilities. For example, the receiving media capabilities supported by the calling terminal include A and B, of which A has the highest priority, followed by B; the sending media capabilities supported by the calling terminal include A, B, and C, and A has the highest priority. C has the second priority and B has the lowest priority;

Step 602, if the calling terminal supports and preferentially uses MPC, construct a PM message, wherein the media capability and corresponding priority and codec attributes are added in the Payload field of the PM message;

Specifically, bits can be reserved in the PM message or new fields can be defined to represent the above information, and the most meaningful upper four bits of the first byte in the Payload can be used to indicate whether the Payload field represents media data or media capability related attributes;

Step 603, the calling terminal starts the MPC process and sends a PM message to the called terminal;

Step 604, the called terminal receives the PM message of the calling terminal, and returns a PM message of response to the calling terminal, and the PM message of response includes the media capability of the called terminal;

The called terminal determines the media capability indicated in the responding PM message according to the media capability supported by itself and the priority of the media capability of the calling terminal. Including the following situations:

1. The codec of the calling terminal is not symmetrical and can simultaneously satisfy (1) the intersection of the sending media capability supported by the called terminal and the receiving media capability supported by the calling terminal and (2) the receiving media capability supported by the called terminal Intersect with the sending media capability supported by the calling terminal;

For example, the called terminal knows that the receiving media capabilities supported by the calling terminal are A and B, among which A has the highest priority, and B has the second priority, and the called terminal supports the sending media capabilities including A and B, then the called terminal Indicate its own sending media capability A in the responding PM message; if the called terminal knows that the calling terminal supports sending media capabilities A, B and C, among them A has the highest priority, C has the second priority, and B's The priority is the lowest, and the receiving media capability supported by the called terminal only includes B and C, then the called terminal indicates its own receiving media capability C in the response PM message;

2. The codec of the calling terminal is symmetrical and can simultaneously satisfy (1) the intersection of the sending media capability supported by the called terminal and the receiving media capability supported by the calling terminal and (2) the receiving media capability supported by the called terminal Intersect with the sending media capability supported by the calling terminal;

For example, the called terminal knows that the codec of the calling terminal is symmetric, and the supported receiving media capabilities are A and B, among which A has the highest priority, B has the second priority, and the called terminal supports only sending media capabilities B, then the called terminal indicates its sending media capability B in the response PM message; because the codec of the calling terminal is symmetrical, the sending media capabilities supported by the calling terminal are also A and B, and A is preferred The priority of B is the highest, and the priority of B is the second, and the receiving media capability supported by the called terminal only includes B, then the called terminal indicates its own receiving media capability B in the response PM message;

3. It cannot satisfy both (1) the intersection of the sending media capability supported by the called terminal and the receiving media capability supported by the calling terminal and (2) the overlap between the receiving media capability supported by the called terminal and the sending media capability supported by the calling terminal intersection;

For example, the called terminal knows that the receiving media capability supported by the calling terminal is A and B, among which A has the highest priority, B has the second priority, and the called terminal only supports the sending media capability C, then the called terminal responds The PM message indicates its own sending media capability C; if the called terminal knows that the sending media capabilities supported by the calling terminal include A, B, and C, among which A has the highest priority, C is the second priority, and B has the priority The lowest, and the receiving media capability supported by the called terminal only includes D, then the called terminal indicates its own receiving media capability D in the response PM message;

Step 605: the calling terminal receives the PM message responded by the called terminal, and determines the media channel for communicating with the called terminal.

If the sending media capability of the calling terminal includes the receiving media capability returned by the called terminal, and at the same time, the receiving media capability of the calling terminal includes the sending media capability returned by the called terminal, it means that the communication between the calling terminal and the called terminal If a normal call can be made through the previously established MPC, the negotiation between the calling terminal and the called terminal is successful.

If the sending media capability of the calling terminal does not include the receiving media capability returned by the called terminal, or the receiving media capability of the calling terminal does not include the sending media capability returned by the called terminal, it means that the calling terminal and the called terminal are not compatible. A normal call can be made through the previously established MPC, but the calling terminal needs to reselect another suitable media channel for communication.

When the called terminal can only express media data in the PM message, the calling terminal judges whether it can parse the audio and video data in the PM message returned by the called terminal. If it can parse, it means that the calling terminal A normal call can be made with the called terminal through the previously established MPC. If it cannot be parsed, the calling terminal discards the PM message and selects another suitable media channel for communication.

In the multimedia negotiation method of the present invention, by carrying the priorities of multiple media capabilities in the PM message of the calling terminal, the called terminal can select the media capability with the highest priority in the calling terminal and the calling terminal among the media capabilities supported by itself. The terminal negotiates; and if the codec of the calling terminal is symmetrical, the PM message of the calling terminal can also indicate multiple media capabilities, which expands the range of media capabilities for the called terminal, improves the success of media negotiation, and expands The versatility of MPC is improved.

Many functional components described in this specification are referred to as modules in order to more particularly emphasize the independence of their implementation.

In the embodiments of the present invention, the modules may be implemented by software so as to be executed by various types of processors. An identified module of executable code may, by way of illustration, comprise one or more physical or logical blocks of computer instructions which may, for example, be structured as an object, procedure, or function. Notwithstanding, the executable code of an identified module need not be physically located together, but may include distinct instructions stored in different bits which, when logically combined, constitute the module and implement the specified Purpose.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs and across multiple memory devices. Likewise, operational data may be identified within modules, and may be implemented in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed in different locations (including on different storage devices), and may exist, at least in part, only as electronic signals on a system or network.

When the module can be realized by software, considering the level of the existing hardware technology, the module that can be realized by software, regardless of the cost, those skilled in the art can build the corresponding hardware circuit to realize the corresponding function. The hardware circuit includes conventional very large scale integration (VLSI) circuits or gate arrays as well as existing semiconductors such as logic chips, transistors, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices, and the like.

In each method embodiment of the present invention, the sequence number of each step can not be used to limit the order of each step. For those of ordinary skill in the art, the order of each step can be changed without paying creative work. Also within the protection scope of the present invention.

The above description is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. multimedia capabilities machinery of consultation is applied in the pre-configured passage MONA-MPC of the negotiation acceleration-medium system of medium, it is characterized in that, comprising:

The first priority P M message is constructed according to the priority of self media capability in said first terminal;

Said first terminal is sent to second terminal with a said PM message; And receiving the 2nd PM message that said second terminal is returned, said the 2nd PM message comprises that said second terminal confirms that according to the priority of the media capability at said first terminal self and said first terminal communicate used media capability;

Said first terminal is according to the definite media channel that communicates with said second terminal of said the 2nd PM message.

2. multimedia capabilities machinery of consultation according to claim 1 is characterized in that,

The priority that a said PM message is carried the media capability at said first terminal, the priority of said media capability comprise the priority and the priority of sending media capability of the receiving media ability at said first terminal.

3. multimedia capabilities machinery of consultation according to claim 2; It is characterized in that; Said the 2nd PM message comprises the transmission media capability and the receiving media ability at said second terminal, and said first terminal confirms that according to said the 2nd PM message the media channel that communicates with said second terminal comprises:

Whether said first terminal judges self possesses the transmission media capability consistent with the receiving media ability at said second terminal, and whether possesses the receiving media ability consistent with the transmission media capability at said second terminal;

When said first terminal possesses the transmission media capability consistent with the receiving media ability at said second terminal; When possessing the receiving media ability consistent with the transmission media capability at said second terminal, said first terminal communicates through pre-configured passage of medium and said second terminal.

4. multimedia capabilities machinery of consultation is applied in the pre-configured passage MONA-MPC of the negotiation acceleration-medium system of medium, it is characterized in that, comprising:

Second terminal receives the first priority P M message that send at first terminal, carries the priority of the media capability at said first terminal in the said PM message;

Said second terminal confirms that according to the priority of the media capability at said first terminal self and said first terminal communicate used media capability;

Said second terminal is sent to said first terminal with determined media capability through the 2nd PM message, so that the media channel that said first terminal is confirmed and said second terminal communicates.

5. multimedia capabilities machinery of consultation according to claim 4; It is characterized in that; The priority of the media capability at said first terminal comprises the priority and the priority of sending media capability of the receiving media ability at first terminal, and said second terminal confirms that according to the priority of the media capability at said first terminal self and said first terminal communicate used media capability and comprise:

Said second terminal confirms that according to the priority of the receiving media ability at said first terminal self and said first terminal communicate used transmission media capability;

Said second terminal confirms that according to the priority of the transmission media capability at said first terminal self and said first terminal communicate used receiving media ability.

6. a multimedia capabilities consulting device is applied in the pre-configured passage MONA-MPC of the negotiation acceleration-medium system of medium, it is characterized in that, comprising:

First constructing module is used for constructing the first priority P M message according to the priority of the media capability at first terminal;

First interface module; Be used for a said PM message is sent to second terminal; And receiving the 2nd PM message that said second terminal is returned, said the 2nd PM message comprises that said second terminal communicates used media capability according to the priority of the media capability at said first terminal determined self and said first terminal;

First processing module is used for confirming the media channel that said first terminal and said second terminal communicate according to said the 2nd PM message.

7. multimedia capabilities consulting device according to claim 6 is characterized in that,

Said first constructing module specifically is used for the priority of the media capability at said first terminal is filled into a said PM message, and the priority of said media capability comprises the priority and the priority of sending media capability of the receiving media ability at said first terminal.

8. multimedia capabilities consulting device according to claim 7 is characterized in that, said the 2nd PM message comprises the transmission media capability and the receiving media ability at said second terminal, and said first processing module comprises:

Judging unit is used to judge whether said first terminal possesses the transmission media capability consistent with the receiving media ability at said second terminal, and whether possesses the receiving media ability consistent with the transmission media capability at said second terminal;

Processing unit; Be used for possessing the transmission media capability consistent with the receiving media ability at said second terminal when said first terminal; When possessing the receiving media ability consistent, confirm that said first terminal communicates through pre-configured passage of medium and said second terminal with the transmission media capability at said second terminal.

9. a multimedia capabilities consulting device is applied in the pre-configured passage MONA-MPC of the negotiation acceleration-medium system of medium, it is characterized in that, comprising:

Second interface module is used to receive the first priority P M message that send at first terminal, carries the priority of the media capability at said first terminal in the said PM message;

Second processing module is used for confirming that according to the priority of the media capability at said first terminal second terminal and said first terminal communicate used media capability;

Second constructing module is used for constructing the 2nd PM message according to the media capability at determined said second terminal;

Said second interface module also is used to send said the 2nd PM message to said first terminal, so that the media channel that said first terminal is confirmed and said second terminal communicates.

10. multimedia capabilities consulting device according to claim 9 is characterized in that, the priority of the media capability at said first terminal comprises the priority and the priority of sending media capability of the receiving media ability at first terminal,

Said second processing module specifically is used for confirming that according to the priority of the receiving media ability at said first terminal said second terminal and said first terminal communicate used transmission media capability, confirms that according to the priority of the transmission media capability at said first terminal said second terminal and said first terminal communicate used receiving media ability.

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