CN1633129A - A Media Server Based on Softswitch - Google Patents

Abstract

A soft-switch media server includes: a preset unit as the host, multiple post sets as the slave units and multiple operation maintenance sets, among which, the preset device is composed of a general information module, a protocol stack module, a resource control module, an operation maintenance access module and a selective resource process module connected with said general information module separately, each post set includes mutually connected general information module and a resource process module, communication wires are used to realize information interaction between the preset unit and the post general information modules, the operation maintenance access modules of the preset unit and operation maintenance sets.

Description

A Media Server Based on Softswitch

technical field

The present invention relates to a kind of media server based on soft exchange, relate to a kind of server that is used for providing various media resources in the next generation network (NGN, Next Generation Network) exactly; Belong to the media information processing device in the telecommunication network technology field.

Background technique

In various telecommunication services, quite a few services require the cooperation of some special media resources (for example: playback resources, recording resources, speech synthesis resources, etc.). Therefore, in the telecommunication network, the Devices are indispensable and important network elements.

Interactive Voice Response (IVR, Interactive Voice Response) and Intelligent Peripheral (IP, Intelligent Peripheral) are two typical devices used to provide various media resources in current telecommunication networks. Both of them can provide five kinds of resources, including playback resources, recording resources, speech synthesis resources, text-to-speech conversion resources, and conference call bridges. Among them, the intelligent peripherals also provide fax, video conference bridge, navigation menu, protocol converter, Capabilities of resources such as video server and call bearer control gateway.

However, the interactive voice response system belongs to the edge technology of the traditional fixed telecommunication network, and the intelligent peripheral device belongs to the traditional intelligent network system. The network architecture, protocol, function and performance supported by both of them are not in line with the next generation network system. For example: First, the interactive voice response system and the intelligent peripherals both use SS7, and do not yet support new protocols based on Internet Protocol IP, such as Session Initiation Protocol (SIP, Session Initiation Protocol), signaling transmission H.248 Protocol family (SIGTRAN, SignalingTransport), etc. Secondly, the interactive voice response system and intelligent peripherals are closed in terms of service provision and are only open to operators, which does not meet the development trend of opening the service development capabilities required by the next generation network to third parties. Furthermore, both the interactive voice response system and the intelligent peripherals are based on circuit switching, and cannot be applied to the next-generation network environment based on packet switching. In addition, from the perspective of the physical layer and the data link layer, the external signaling and bearer interfaces of the interactive voice response system and intelligent peripherals are generally E1 interfaces. will be phased out. Therefore, interactive voice response systems and intelligent peripherals can no longer meet the requirements of the next-generation network based on Internet Protocol IP and packet switching.

Although, Chinese invention patent application "seamless, scalable distributed media server" (publication number: CN1324461A) provides a kind of multimedia server that is used in Internet field, so that reduce the bottleneck effect of system. However, the problem solved by this invention patent application is aimed at the Internet field, not applicable to the telecommunication network, especially not applicable to the special technical requirements of the media server in the next generation telecommunication network. Therefore, the research and development of a softswitch-based media server to adapt to the development direction of the telecommunication network to the next-generation network NGN has become an urgent technical problem to be solved.

Contents of the invention

In view of this, the purpose of the present invention is to provide a media server based on softswitch, which can support various signaling protocols in the next generation network, and provide Extensive media resource support.

In order to achieve the above-mentioned purpose, the present invention provides a kind of media server based on soft switch, and its technical scheme is: this device includes: a front-end machine used as the master, a plurality of back-end machines used as slaves and multiple An operation and maintenance machine; the front-end machine includes: a general message module, and a protocol stack module, a resource control module, and an operation and maintenance access module respectively connected to the general message module; the back-end machine includes: a general message module connected to each other The message module and the resource processing module; among them, information exchange is realized through communication lines between the general message module of the front-end machine and each back-end machine, and between the operation and maintenance access module of the front-end machine and each operation and maintenance machine.

The function of the front-end processor is: through the protocol stack module and the external network entity, including but not limited to the sending and receiving of SIP signaling or H.248 signaling; performing unified management, distribution and processing of various media resources of the media server control; perform flow control and load balancing control on each back-end machine; exchange information with the operation and maintenance machine through the operation and maintenance access module, receive and execute various operation/maintenance commands for the front-end machine issued by the operation and maintenance machine, and Return the execution result; and receive various operation/maintenance commands for the back-end machine from the operation and maintenance machine on behalf of the back-end machine, and forward them to the corresponding back-end machine.

The front-end processor can be equipped with a resource processing module, and the function of the resource processing module is: to provide various media resources, and to perform at least real-time transport protocol RTP (Real-time Transport Protocol) and real-time transport control with external network entities The protocol RTCP (Real-time Transport Control Protocol) receives and sends media bearer protocol messages to realize the two-way exchange of audio/video media information; accepts the control of the resource control module, and uses the underlying hardware board resources or calls the digital signal processing DSP of the software type The application programming interface API (Application Programming Interface) is used to control the use of media resources, so that the resource control module can adapt to various underlying application programming interface APIs.

The protocol stack module includes two submodules: the front-end submodule of the protocol stack that completes the transport layer of the standard signaling message and the message packet processing of the following protocol layers, and the proxy submodule of the protocol stack that completes the encoding and decoding of the standard signaling message; The function of the protocol stack module is to perform protocol conversion between the external control entity and the internal resource control module, and complete the encoding and decoding of signaling messages.

Described protocol stack agent submodule is made up of H.248 protocol stack agent submodule H248PAM (H.248Protocol stack Agent Module) and SIP protocol stack agent submodule SIPPAM (SIP Protocolstack Agent Module). The module uses the general message protocol GMP to encapsulate the decoded H.248 protocol messages or SIP protocol messages, and provides them to the H.248 application sub-module H248AppM or SIP application sub-module SIPPAM through the general message module; H248 application sub-module H248AppM Or the SIP application sub-module SIPAppM encapsulates the unencoded H.248 protocol message or the necessary information of the SIP protocol message generated by itself with GMP, and sends them to the two protocol agent sub-modules respectively through the general message module, and then the The two protocol agent sub-modules encode the message and send it to the control device of the media server.

The general message module of the front-end processor includes two sub-modules: the real-time message sub-module that completes the distribution and routing control of signaling and other real-time messages, and the non-real-time message sub-module that completes the distribution and routing control of at least operation and maintenance messages and network management messages. Message sub-module; the function of this general message module is to serve as the communication hub between each module of the front-end processor and between the front-end processor and the rear-end processor, providing routing and forwarding messages for the communication between the various modules.

The resource control module includes:

The resource management sub-module RMM (Resource Management Module) is used to manage various resources in the device involving the management and control protocols of SIP and H.248 resource capabilities; this sub-module obtains the hardware board of the media server through the resource configuration file Capability and the loading of digital signal processing DSP capability in software form; and provide various descriptions of resources for H.248 application submodule H248AppM and SIP application submodule SIPAppM (for example, obtain voice files according to the identifier toneId of voices such as dial tone and busy tone The name of the transport layer protocol used to carry the real-time transport protocol RTP, that is, the port number of the user datagram protocol UDP, the codec capability of the aforementioned port, etc.) and protocol-related resources (such as the termination of the H.248 protocol point identifier terminationId, context identifier contextId, pre-loaded telephone dial digit string format digitMap, etc.);

The H.248 application sub-module H248AppM (H.248 Application Module) is responsible for realizing the protocol function of H.248, directing the resource processing module to realize the resource function of the media server; .248 message, and send the internal resource control protocol IRCP message formed by the sub-module and the resource part to the resource processing module; this module also contains various data structures related to calls and protocols, which can be used in the media server management of the call under the control of an external controlling entity;

The SIP application sub-module SIPAppM (SIP Application Module) is responsible for realizing the protocol function of SIP, directing the resource processing module to realize the resource function of the media server; interpreting the SIP message sent from the SIP protocol stack agent sub-module SIPPAM, and sending the sub-module The IRCP message formed by the related operations between the module and the resource part is sent to the resource processing module; this module also contains various data structures related to calls and protocols, and can manage calls under the control of the external control entity of the media server;

The general message encapsulation sub-module GMEM (General Message Encapsulation Module) is responsible for encapsulating IRCP messages into general message protocol GMP (General Message Protocol) messages, and unpacking GMP messages into IRCP messages for IRCP message users;

The overall control sub-module (OCM, Overall Control Module), as the overall operation scheduling sub-module, is responsible for the initialization of other sub-modules, and then calls H248AppM and SIPAppM respectively in a polling manner, checks each input message flow, and performs corresponding processing.

The functions of the resource control module are: responsible for the allocation and release of all media resources; background distributed processing of signaling messages encapsulated by the general message module; sending external control devices obtained through interaction with the protocol stack module The command is processed, and then interacts with the resource processing module to control the use of media resources, so that the resource processing module can adapt to various external control protocols.

The function of the operation and maintenance access module is to receive the operation and maintenance command sent by the operation and maintenance machine, and realize the operation and maintenance function of each other module through the interaction with the general message module.

The functions of the post-processor are: to accept the control of the front-end processor, perform allocation, recycling, identification and other operations on media resources according to the instructions of the front-end processor, and return the operation result; The current working status of the rear-end processor is used to cooperate with the front-end processor to achieve load balancing and flow control; receive and execute the operation and maintenance commands forwarded by the front-end processor, and return the execution result; through the case inspection message, it is found that the front-end When a single machine fails, select one of the backend machines as the host, start the host process, and re-register with the external control entity.

The general message module of the back-end machine includes two sub-modules: the real-time message sub-module that completes the distribution and routing control of signaling and other real-time messages, and the non-real-time message sub-module that completes the distribution and routing control of at least operation and maintenance messages and network management messages. A message sub-module; the function of the general message module is to communicate and interact with the general message module in the front-end processor, and to forward messages between the front-end processor and the rear processor.

The function of the resource processing module of the post-installation machine is: to provide various media resources, and at least include the receiving and sending of Real-time Transport Protocol RTP and Real-time Transport Control Protocol RTCP media bearer protocol messages with external network entities, and realize audio /Two-way exchange of video media information; accept the control of the resource control module of the front-end processor, control the use of media resources through the underlying hardware board resources or call the application programming interface API of the digital signal processing DSP in the form of software, so that the front-end The resource control module can adapt to a variety of different underlying application programming interface APIs.

The function of the operation and maintenance machine is: to operate and maintain the front-end machine and the back-end machine, access the front-end machine through the operation and maintenance access module, send all commands to the front-end machine, and judge the order by the front-end machine The ultimate recipient; used as a human-machine interface for operation and maintenance personnel.

The H.248 application sub-module H248AppM and the resource processing module and the SIP application sub-module SIPAppM and the resource processing module adopt a self-defined internal resource control protocol IRCP (Internal Resource Control Protocol) to communicate; the rest of the media server The modules use the custom general message protocol GMP (General Message Protocol) to communicate.

The present invention is a media server based on soft switch, and its structural feature is that it adopts the combined form of the front-end machine and the back-end machine, which is flexible and convenient in configuration and reliable in operation. It can not only ensure that when the demand for system capacity increases, the number of back-end machines can be dynamically increased to achieve server scalability; but also, once a single machine failure occurs in the front-end machine, and other back-end machines find the fault through routine inspection messages , the system can select one of the back-end machines to replace the original front-end machine, and then through the necessary module configuration, start the process required by the front-end machine, and re-register with the external control entity as a fully functional media server to ensure the smooth flow of telecommunication services .

In the present invention, the resource processing module in the back-end machine is mandatory, and the difference is that the resource processing module in the front-end machine is optional. In this way, when the traffic volume is low, the front-end processor can activate the module, which ensures that the resource control module and the resource processing module are in the same physical computer, reduces the communication overhead between the two modules, and further improves the performance of the media server. The processing function and efficiency; when the traffic volume increases, the front-end processor can no longer activate the module, reducing the workload of the front-end processor, and at the same time, the resource processing module is placed in the scalable rear-end processor , greatly improving the overall processing capability of the media server.

In the present invention, the operation and maintenance command of the rear machine is forwarded to the rear machine after the front machine receives the command from the operation and maintenance access module through its operation and maintenance access module; instead of the operation and maintenance machine directly interacting with the rear machine, It ensures the transparency of the internal configuration structure of the unit composed of the front-end machine and the back-end machine to the operation and maintenance machine, and also ensures the single-point access of the operation and maintenance machine, which simplifies the access process.

The present invention adopts a self-defined internal resource control protocol IRCP message for the information interaction between the resource control module and the resource processing module, so that the resource control module can shield the difference of the external control protocol for the resource processing module; that is, the resource processing module does not It will perceive the specific type of signaling protocol (such as SIP and H.248) used by the media server to interact with external devices, and the resource processing module will process it in a unified manner, making the resource processing module independent of the specific signaling protocol, reducing The upgrade and maintenance workload of the signaling protocol. At the same time, the IRCP protocol is adopted between the resource control module and the resource processing module, so that the resource processing module can shield the difference of the underlying API for the resource control module; that is, the resource control module will not perceive the specific API used by the current resource processing module Types (such as hardware board resource API or software DSP API), resource control modules are processed in a unified manner, reducing the workload of upgrading and maintaining media resources.

In addition, the self-defined general message protocol GMP message and the IRCP message of the internal resource control protocol used in the device by the present invention enable the device to flexibly add new signaling protocols (such as media gateway control) according to future needs. The support of the protocol MGCP ensures the transparency of the media server to the standard signaling protocol.

Description of drawings

Fig. 1 is the structural composition schematic diagram of the media server based on soft switch of the present invention;

Fig. 2 is a schematic diagram of the connection relationship between the media server based on softswitch and other network equipment in the present invention;

Fig. 3 is the internal network connection schematic diagram of the media server based on soft switch in the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of the IRCP/GMP protocol stack in the softswitch-based media server of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, the present invention is a kind of media server based on softswitch, and this device includes: a front-end machine 1 used as host, many back-end machines (shown in the figure as three, respectively) as slave Marked as: 2, 3, 4) and multiple operation and maintenance machines (two are shown in the figure, marked as: 5, 6 respectively); wherein the front-end machine 1 includes: a general message module 12, and a The protocol stack module 11, the resource control module 13, the operation and maintenance access module 14 and the optional resource processing module 15 connected to the module 12 respectively; the rear machines 2, 3 and 4 respectively include: a general message module 21 connected to each other . The operation and maintenance access module 14 of 1 realizes information interaction with each operation and maintenance machine 5, 6 through communication lines.

Front-end processor 1 function of the present invention mainly comprises: carry out SIP by protocol stack module 11 with external network entity, the receiving and sending of signaling such as H.248; Unified management, distribution and control various media resources (such as receivers, audio mixing devices, video codecs, etc.). For example, when a call enters the media server, the front-end processor will allocate an appropriate type and amount of idle media resources for the call, and during the call, the front-end processor will also increase Subtract the media resources used by the call, and when the call ends, the front-end processor will reclaim the previously allocated media resources and make them idle for use by other subsequent calls. When a media resource fails, the front-end processor 1 marks the resource as unavailable, and marks it as available again after the failed media resource is repaired. Carry out load balancing control and flow control on each back-end machine; the specific method is: the front-end machine bases the current total processing capacity of each back-end machine, the idle processing capacity of each back-end machine, and the processing capacity required for new incoming calls and other factors to determine which back-end machine to assign the current new incoming call to, so as to achieve load balancing between each back-end machine, improve the total throughput of the media server, and avoid certain back-end machine loads Overweight and other rear-mounted machines with lighter loads. When there is a large amount of calls entering the media server, the front-end machine will selectively accept a part of the new calls according to the current load of each back-end machine according to the set strategy and algorithm, and forward them to the back-end machine to ensure that the back-end machine Will not be paralyzed by too much load. Interact with the operation and maintenance machine, receive and execute various operation and maintenance commands of the operation and maintenance machine for the front-end machine, and return the execution results; at the same time, receive various operation and maintenance commands for the back-end machine on behalf of the back-end machine, and forward them To the corresponding back-end machine, and the corresponding back-end machine is responsible for the specific implementation. The optional resource processing module is used to provide various media resources, and receive and send media bearer protocol messages such as real-time transport protocol RTP/real-time transport control protocol RTCP with external network entities to achieve two-way exchange of audio, video, etc. Purpose of Media Information.

The functions of the backend machine mainly include: a resource processing module is used to provide various media resources, and receive and send media bearer protocol messages such as RTP/RTCP with external network entities to achieve two-way exchange of audio, video and other media information the goal of. Accept the control of the front-end processor, perform specific operations such as allocation, recycling, and identification of media resources according to the instructions of the front-end processor, and return the operation result. According to the set policy, report the current state of each back-end machine to the front-end machine, such as normal state, fault state, light load state, overload state, etc., so as to cooperate with the front-end machine to realize load balancing, flow control and other mechanisms; The operation and maintenance command forwarded by the machine is executed and executed, and the execution result is returned. If a single machine failure occurs in the front-end machine, the other back-end machines will find the failure through routine inspection messages, and select one of them as the master, start the process required by the master, and re-register with the external control entity.

The main functions of the operation and maintenance machine are: to operate and maintain the front-end processor and the rear-end processor, access the front-end processor as needed, send all commands to the front-end processor, and determine the final receiver of the command by the front-end processor; Man-machine interface for operation and maintenance personnel.

The installation position of the media server of the present invention in the network system is shown in FIG. 2 . The softswitch device can control the media server, and the application server can also control the media server through the Parlay gateway. Under the control of a control device (such as a softswitch, or an application server/Parlay gateway), the media server can interact with the VoiceXML document server to obtain business logic in the form of VoiceXML to instruct the next step on media resources. Operation; it can also interact with the text-to-speech TTS (Text To Speech)/Automatic Speech Recognition ASR (Automatic Speech Recognition) server to complete the text-to-speech or automatic speech recognition function. The media server can also communicate with the terminals in the traditional network through the media gateway to transmit various media information in both directions, and can also establish a direct bearer channel between the media server and the terminal supporting the IP protocol in the next-generation network.

Referring to Fig. 3, the present invention has carried out experiment and implemented in Beijing University of Posts and Telecommunications Network and Exchange State Key Laboratory, and the front-end machine 1 of this media server test prototype adopts 1 HP minicomputer RP3410 (2 CPUs, CPU main frequency is 800MHz, the operating system is HPUX 11i, the memory is 1G, the hard disk is 2×72G), there are 3 sets of rear machines 2, 3, and 4, each using 1 ADLINK CSP-9801 industrial computer (CPU is Intel Pentium III 1GHz , the operating system is solaris 8, the memory is 512M, the hard disk is 36G, and the resource board is NMS CG6000), and the operation and maintenance machine 5 uses a PC (the main frequency of the CPU is Intel2.2GHz, the operating system is Windows XP, and the memory is 256M, the hard disk is 40G). Among them, the front-end machine 1, the back-end machines 2, 3, 4 and the operation and maintenance machine 5 form a local area network through an Ethernet switch 7, so as to realize the front-end machine 1 and the back-end machines 2, 3, 4, front-end Communication between machine 1 and operation and maintenance machine 5.

Referring to Fig. 1 again, take a basic broadcasting and number collection process as an example below to specifically introduce the cooperation process of each module inside the media server of the present invention:

When the protocol stack module 11 in the front-end processor 1 receives a message (the first message) requiring to set up a new call from the external control entity, the protocol stack module 11 sends the message to the general message module 12 after encapsulating the message with the GMP protocol The general message module 12 forwards the message to the resource control module 13 according to the information in the GMP message header; the resource control module 13 decapsulates the received GMP message, and uses Load balancing mechanism and flow control mechanism to decide whether to assign the new call to the resource processing module for processing, and which resource processing module to assign to; suppose the result of the control processing of the above two mechanisms is to assign the new call to the rear resource processing module 32 in the machine 3, then the resource control module 13 first updates the call instance dynamic data managed by itself, marks the state of the media resource to be allocated as occupied, then encapsulates the IRCP message with the GMP protocol, and sends it to the general message module 12 The general message module 12 in the front-end machine 1 forwards the message to the general message module 31 in the back-end machine 3 according to the information in the GMP message header; the general message module 31 further forwards the message to the resource processing module 32, and the resource The processing module 32 decapsulates the received GMP message, allocates appropriate playback resources to the new call according to the received IRCP message, and establishes an RTP transceiver port. After the operation is successful, the resource processing module 32 returns the operation result: first encapsulate the IRCP message carrying the operation result with the GMP protocol, and then send it to the general message module 31; On the contrary, it will not be repeated here.

When the protocol stack module 11 in the front-end processor 1 receives a message (the second message) that requires playing and receiving the number from the external control entity, its message forwarding process is similar to the forwarding process of the above-mentioned first message, the difference What is more important is that the resource control module 13 no longer uses the load balancing mechanism and the flow control mechanism, but inquires about the call instance dynamic data managed by itself, and sends the message to the resource processing module 32 of the backend machine 3 that processes the call; the resource processing module 32 decapsulate the received GMP message, and broadcast the specified voice file to the established RTP port according to the received IRCP message; similarly, after the operation is successful, the resource processing module 32 returns the operation result, and its process corresponds to returning the first message The transfer process of the operation result is the same and will not be repeated here.

At this point, the business user can hear the voice prompt sent by the media server; if the user inputs a DTMF digital signal through the keyboard of the terminal at this time, the resource processing module 32 of the media server can start from the RTP associated with the call. The input digital signal is received in the port; after the resource processing module 32 receives the complete digital signal, it puts these numbers in the IRCP message packet, and sends them to the external control entity along the transmission path of returning the operation result.

When the protocol stack module 11 in the front-end processor 1 receives a message (the third message) requiring to end the call from the external control entity, its message forwarding process is similar to the forwarding process of the second message, the difference is that when the resource When the processing module 32 receives the corresponding IRCP message, it will release the media resource allocated to the call and return the operation result. When the resource control module 13 receives the operation result message sent by the resource processing module 32, it updates the dynamic data of the call instance it manages, and marks the corresponding media resource state as idle; the media server finally sends the third message through the protocol stack module 11. The result of the operation is returned to the external control entity.

Referring to Fig. 4, taking the information interaction between the resource control module 13 in the front-end machine 1 and the resource processing module 32 in the back-end machine 3 as an example, briefly introduce the IRCP/GMP protocol stack in the media server based on softswitch of the present invention Structure: The general message protocol GMP is carried by the transmission control protocol TCP above the IP protocol, and the internal resource control protocol IRCP is further carried by GMP. Not only the GMP protocol must be processed between the resource control module 13 and the resource processing module 32, but also the IRCP protocol needs to be processed simultaneously; and only the GMP protocol needs to be processed between their general message modules 12 and 31, that is, for these two general message modules Generally speaking, the content of the IRCP protocol is transparent and invisible. GMP is a hop by hop protocol, while IRCP is an end-to-end protocol.

Claims (14)

1, a kind of media server based on soft switch, it is characterized in that: this device includes: a front end processor as main frame, many rearmounted machine and Duo Tai Operation and Maintenance machines as slave; Described front end processor includes: universal information module, and the protocol stack module, resource control module and the Operation and Maintenance access module that are connected respectively with this universal information module; Rearmounted machine includes: interconnective universal information module and resource processing module; All realize information interaction wherein between the universal information module of front end processor and each rearmounted machine, and between the Operation and Maintenance access module of front end processor and each Operation and Maintenance machine by communication line.

2, media server according to claim 1 is characterized in that: the function of described front end processor is: include but not limited to SIP signaling or the H.248 transmitting-receiving transmission of signaling by protocol stack module and external network entity; Various media resources to this media server carry out unified management, distribution and control; Each rearmounted machine is carried out flow control and load balancing control; Carry out information interaction by Operation and Maintenance access module and Operation and Maintenance machine, various operation/maintenance commands that reception and executable operations maintenance machine send at front end processor, and return execution result; And represent rearmounted machine to receive various operation/maintenance commands that the Operation and Maintenance machine sends, and be transmitted to corresponding rearmounted machine at rearmounted machine.

3, media server according to claim 1 and 2, it is characterized in that: described front end processor can be matched the resource processing module, the function of this resource processing module is: be used to provide various media resources, and comprise the reception and the transmission of realtime transmission protocol RTP and RTCP Real-time Transport Control Protocol RTCP media bearer protocol message at least with external network entity, realize the two-way exchange of audio/video media information; Accept the control of resource control module, control the use of media resource by bottom hardware integrated circuit board resource or the API API that calls the Digital Signal Processing DSP of form of software, make the resource control module can adapt to various bottom API API.

4, media server according to claim 1, it is characterized in that: described protocol stack module comprises two submodules: finish the protocol stack front terminal module that the message bag of the transport layer of standard signaling message and following protocol layer is handled, and the protocol stack of finishing the encoding and decoding of standard signaling message is acted on behalf of submodule; The function of this protocol stack module is: externally carry out protocol conversion between controlled entity and the internal resource control module, finish the encoding and decoding of signaling message.

5, media server according to claim 4, it is characterized in that: described protocol stack is acted on behalf of submodule and is acted on behalf of submodule H248PAM and Session Initiation Protocol stack by protocol stack H.248 and act on behalf of submodule SIPPAM two parts and form, these two protocol stacks are acted on behalf of submodule and are utilized universal information agreement GMP respectively decode later H.248 protocol message or Session Initiation Protocol message to be encapsulated, and offer respectively by the universal information module and H.248 to use submodule H248AppM or SIP and use submodule SIPPAM; The H.248 protocol message that the process that H248 application submodule H248AppM or SIP application submodule SIPAppM produce self with GMP is encoded or the essential information of Session Initiation Protocol message do not encapsulate respectively, and send this two agency by agreement submodules respectively to by the universal information module, issue the control appliance of media server after by these two agency by agreement submodules message being encoded again.

6, media server according to claim 1, it is characterized in that: the universal information module of described front end processor comprises two submodules: finish the real-time messages submodule of the distribution of signaling and other real-time messages and route control, and finish the distribution that comprises Operation and Maintenance message and webmaster message at least and the non real-time message submodule of route control; This universal information functions of modules is as between each module of front end processor and the signal centre between front end processor and the rearmounted machine, for the communication between each module provides route and transmits message.

7, media server according to claim 1 is characterized in that: described resource control module comprises:

Resource management submodule RMM is used for managing this device and relates to SIP and the H.248 management of resource capability and the various resources of control protocol itself; This submodule obtains the loading of the Digital Signal Processing DSP ability of the hardware integrated circuit board ability of media server and form of software by the resource distribution file; And for H.248 use submodule H248AppM and SIP use submodule SIPAppM provide resource various descriptions and with protocol-dependent resource;

H.248 use submodule H248AppM, responsible realization protocol function H.248, the resource function of commander's resource processing modules implement media server; Make an explanation to act on behalf of the H.248 message that submodule H248PAM sends here from protocol stack H.248, and this submodule and resource part are carried out the internal resource control protocol IRCP message that associative operation forms send to the resource processing module; This module also comprises various and calling and protocol-dependent data structure, can manage calling under the control of the external control entity of media server;

SIP uses submodule SIPAppM, is responsible for realizing the protocol function of SIP, the resource function of commander's resource processing modules implement media server; Make an explanation to act on behalf of the sip message that submodule SIPPAM sends here from the Session Initiation Protocol stack, and this submodule and resource part are carried out the IRCP message that associative operation forms send to the resource processing module; This module also comprises various and calling and protocol-dependent data structure, can manage calling under the control of the external control entity of media server;

Universal information encapsulation submodule GMEM is responsible for IRCP message is packaged into universal information agreement GMP message, and is responsible for GMP message separated and is bundled into IRCP message, offers IRCP message user;

Master control submodule OCM as overall operation scheduling sublayer module, is responsible for the initialization of other each submodules, calls H248AppM and SIPAppM respectively with polling mode then, checks each input message flow, and handles accordingly.

8, according to claim 1 or 7 described media servers, it is characterized in that: the function of described resource control module is: be responsible for the distribution and the release of all media resources; To carrying out the backstage distributed treatment via the signaling message after the universal information module package; The order that sends via the external control devices that is obtained after mutual with protocol stack module is handled, then, carry out alternately with the resource processing module, the use of control media resource is so that the resource processing module can adapt to various external control agreement again.

9, media server according to claim 1, it is characterized in that: the function of described Operation and Maintenance access module is: receive the operational maintenance command that the Operation and Maintenance machine is sent, by with the mutual realization of universal information module Operation and Maintenance function to each other modules.

10, media server according to claim 1 is characterized in that: the function of described rearmounted machine is: accept the control of front end processor, according to the instruction of front end processor media resource is carried out and distributed, reclaim, identify and other operation, and the return result; Report the various operating states that each rearmounted machine is current according to setting strategy to front end processor, realize load balancing and flow control to cooperate front end processor; Receive and carry out by front end processor and transmit the operational maintenance command of coming, and return execution result; When finding front end processor generation unit fault, select wherein a rearmounted machine as main frame, and start the main frame process, again to outside controlled entity registration by example inspection message.

11, according to claim 1 or 10 described media servers, it is characterized in that: the universal information module of described rearmounted machine comprises two submodules: finish the real-time messages submodule of the distribution of signaling and other real-time messages and route control, and finish the distribution that comprises Operation and Maintenance message and webmaster message at least and the non real-time message submodule of route control; This universal information functions of modules is: communicate alternately with the universal information module in the front end processor, transmit message between front end processor and rearmounted machine.

12, according to claim 1 or 10 described media servers, it is characterized in that: the function of the resource processing module of described rearmounted machine is: be used to provide various media resources, and comprise the reception and the transmission of realtime transmission protocol RTP and/or RTCP Real-time Transport Control Protocol RTCP media bearer protocol message at least with external network entity, realize the two-way exchange of audio/video media information; Accept the control of the resource control module of front end processor, control the use of media resource by bottom hardware integrated circuit board resource or the API API that calls the Digital Signal Processing DSP of form of software, make the resource control module of front end processor can adapt to various bottom API API.

13, media server according to claim 1, it is characterized in that: the function of described Operation and Maintenance machine is: front end processor and rearmounted machine are carried out operation and maintenance, insert front end processor by the Operation and Maintenance access module, all orders are all sent to front end processor, judge the final recipient of order by front end processor; Man-machine interface as the Operation and Maintenance personnel.

14, media server according to claim 1 is characterized in that: describedly H.248 use between submodule H248AppM and the resource processing module and SIP uses that the self-defining internal resource control protocol IRCP of employing communicates between submodule SIPAppM and the resource processing module; Adopt self-defining universal information agreement GMP to communicate between each module of all the other of this media server.

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