CN102271137B - a media server - Google Patents

Abstract

The invention discloses a media server, which comprises a protocol processing module, a media issuing module, a VOIP module, a circuit switching module and a data management module, wherein the protocol processing module is used for receiving a first service request which is sent by a media gateway control device and is based on an H.248 protocol, the media issuing module is used for obtaining a first multimedia stream of a corresponding IP domain based on the first service request, the VOIP module is used for receiving the first multimedia stream and converting the first multimedia stream into a second multimedia stream which is based on E1 bearing, the circuit switching module is used for receiving the second multimedia stream and providing the second multimedia stream, and the data management module is used for receiving a control message from the protocol processing module and managing circuit resources, IP resources and DSP resources of the media server.

Description

a media server

technical field

The invention relates to the technical field of communication, in particular to a media server.

Background technique

Please refer to FIG. 1, which is a network structure diagram of information communication between the CS (Circuit Switched, circuit switched) domain and the PS (Packet Switched, packet switched) domain through the IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) in the prior art, specifically Generally speaking, it includes: CS domain communication equipment, relay gateway, MG (Media Gateway, media gateway), MGCF (Media Gateway Control Function, media resource control function), MS (Media Server, media server) and PS domain communication equipment, etc.

The data exchange process of the CS domain device is to first establish a circuit connection (virtual circuit can be used), and then perform data exchange. After the data exchange is completed, the circuit is released, while the PS domain divides a datagram into several fragments, and then sends them at the same time. The route of each data segment may be different, and the route of each data segment depends on the specific conditions of the network and the routing protocol used.

Because the data exchange modes adopted by the two exchange domains are inconsistent, it is necessary to introduce intermediate devices such as MG or VIG (Video Interwork Gateway, Video Interwork Gateway) in the network communication to convert the data information of the CS domain through the data conversion of the MG or VIG Processing, transmission to the PS domain, and then realize the information communication of the two data exchange domains.

It can be seen that in the prior art, in order to enable the CS domain and the PS domain to communicate with each other, there is a technical problem that the network must be transformed and an intermediate device MG or VIG is added. This technical problem also directly increases the investment cost of the network operator. At the same time, when maintaining a normal network environment, it also increases the difficulty and cost of network technical maintenance.

Contents of the invention

The present invention provides a method and system for supporting circuit domain users to access a media server to solve the problem in the prior art that the CS domain and the PS domain can communicate with each other, and then the network needs to be remodeled, and an intermediate device MG or VIG is added. technical problems.

On the one hand, the present invention provides the following technical solutions through an embodiment of the application:

A kind of media server, described media server is used in the IP multimedia network that comprises media gateway control device, comprises:

A protocol processing module, configured to receive a first service request based on the H.248 protocol sent by the media gateway control device, the first service request is sent to the media gateway control by the calling user equipment in the CS domain The device's request including the called user information is also used to access the calling user equipment to the IP multimedia network based on the first service request;

A media issuing module, configured to obtain, based on the first service request, a first IP domain-based multimedia stream corresponding to the first service request;

A VOIP module, configured to receive the first multimedia stream and convert it into a second multimedia stream based on E1 bearer;

A circuit switching module, configured to receive the second multimedia stream, and provide the second multimedia stream to the called user equipment based on the first service request.

A data management module, connected to the protocol processing module, for receiving control messages from the protocol processing module, for configuring the protocols in the multimedia server, media stream processing, and managing circuit resources and IP resources, DSP resources.

Preferably, when the VOIP module is based on the media flow in the IP domain, it is encapsulated in the following manner: according to the MTP link transmission protocol of E1, after decoding the media flow in the IP domain, it is marked as an E1 bearer flow, so that it can Transmission is carried out on the E1 physical link.

On the other hand, the present invention provides a method for processing ADD signaling through another embodiment of the present application, the method is applied to a media server in an IP multimedia network including a media gateway control device, and the method includes:

receiving ADD signaling based on the H.248 protocol sent by the media gateway control device, and establishing a context CONTEXT based on the ADD signaling, wherein the ADD signaling includes a circuit domain terminal ID;

converting the terminal ID into a circuit domain system logical node number in the media server, and then assigning corresponding relay terminal resources to the circuit domain system logical node number;

Opening the circuit domain channel and voice conversion channel corresponding to E1 of the circuit switching module in the media server based on the logical node number of the circuit domain system;

Applying for RTP resources through the resource management interface of the data management module in the media server based on the logic node number of the circuit domain system;

Open the RTP channel in the media issuing module in the media server;

Returning a response message for responding to the ADD signaling to the media gateway control device.

Preferably, the ADD signaling also includes: the sending and receiving mode of the RTP end, the voice compression algorithm or video compression algorithm used, the m line includes whether the media requirement of the service object is audio or video, the default packaging duration, and the network jitter range requirements , the attribute information of IPV4 or IPV6 is used.

Preferably, after converting the user terminal ID into a circuit domain system logical node number in the media server, and then assigning corresponding relay terminal resources to the circuit domain system logical node number, the method further includes:

Based on the resource management interface of the data management module, request the internal port IP and Port number of the VOIP module in the media server corresponding to the terminal resource of the relay.

Preferably, the internal port IP and Port number are allocated according to the rule of binary correspondence of data configuration.

Preferably, after opening the circuit domain channel and voice conversion channel corresponding to the E1 of the circuit switching module in the media server based on the logical node number of the circuit domain system, the method further includes:

Setting the audio and video compression algorithm of the local end of the VOIP module;

Set the packaging duration jitter abnormal alarm attribute of the local end of the VOIP module;

Add the terminal into the context CONTEXT, and record the corresponding relationship between the terminal and the logic node number of the circuit domain system in the data area of the protocol processing module of the media server.

Preferably, after applying for the RTP resource through the resource management interface of the data management module in the media server based on the logical node number of the circuit domain system, the method further includes:

Obtain the internal IP, internal PORT, external IP, and external PORT of the RTP resource, and record the corresponding relationship between the logical node numbers of the circuit domain system and the logical node numbers of the RTP system.

Preferably, after opening the RTP channel in the media issuing module in the media server, it also includes:

Set the sending and receiving status of the RTP terminal;

Decide whether to use IPV4 to encapsulate the media package or to use IPV6 to encapsulate the media package;

Add the RTP terminal to the context CONTEXT, and the PPM adds the RTP terminal to the created CONTEXT; and record the corresponding relationship between the RTP terminal and the logic node number of the circuit domain system in the data area of the protocol processing module.

On the other hand, the present invention also provides a method for processing MOD signaling through another embodiment of the application, the method is applied to a media server in an IP multimedia network including a media gateway control device, and the method include:

receiving MOD signaling based on the H.248 protocol sent by the media gateway control device, where the MOD signaling includes a context ID and an RTP terminal;

Based on the context ID, query the RTP system logical node number corresponding to the RTP terminal recorded in the context data area of the H.248 protocol;

Based on the logical node number of the RTP system, the remote RTP IP address and port number of the data management module corresponding to the RTP resource in the media server are set;

Based on the logical node number of the RTP system, search for the logical node number of the circuit domain system corresponding to the data area in the protocol processing module in the media server, and set the corresponding logical node number of the VOIP module in the media server based on the logical node number of the circuit domain system properties of the port;

Record the remote RTP IP address of the RTP resource, the port number, and the attributes of the port corresponding to the VOIP module into the data area in the protocol processing module in the media server, and return the response to the media gateway control device to the media gateway control device. Response message of MOD signaling.

Preferably, the MOD signaling further includes: the remote RTP IP address and port number negotiated between the media gateway control device and the message interworking gateway, the remote voice compression algorithm, and the remote packaging duration.

Preferably, the remote RTP IP address and port number are the external service address and port number of the media server; the remote voice compression algorithm is the voice compression algorithm of the media server; the remote package The duration is the packaging duration of the media server.

On the other hand, the present invention also provides a method for processing SUB signaling through another embodiment of the application, the method is applied to a media server in an IP multimedia network including a media gateway control device, and the method include:

receiving the SUB signaling based on the H.248 protocol sent by the media gateway control device,

The SUB signaling includes the context ID, the RTP terminal and the circuit domain terminal;

Based on the context ID, query the RTP system logical node number corresponding to the RTP terminal and the circuit domain system logical node number corresponding to the circuit domain terminal recorded in the context data area of the H.248 protocol;

Close the RTP channel in the media server based on the logical node number of the RTP system;

Closing the circuit domain channel and voice conversion channel based on the logic node number of the circuit domain system;

Returning a response message for responding to the SUB signaling to the media gateway control device, and reporting statistical media flow information.

Preferably, after closing the RTP channel in the media server, it also includes:

Based on the logical node number of the RTP system, by calling the data management interface of the data management module in the media server, releasing the logical node number resource of the RTP system, and setting the data management resource channel corresponding to the logical node number of the RTP system is idle.

Preferably, after closing the circuit domain channel based on the logical node number of the circuit domain system, it further includes:

Based on the logical node number of the circuit domain system, call the data management interface of the data management module in the media server, release the logical node number resource of the circuit domain system, and set the data management resource corresponding to the logical node number of the circuit domain system The channel is set to idle state.

One or more technical solutions in the above technical solutions have the following technical effects or advantages:

1. By providing a media server, using the coordinated processing between the various modules in the media server, the data format of the circuit domain is converted into a data format that can be communicated in the packet switching domain, so as to solve the problem in the prior art that the CS domain Communication with the PS domain can be realized with each other, and there is a technical problem that the network must be transformed and the intermediate equipment MG or VIG is added, so that the CS domain users can directly communicate with the CS domain under the premise of simplifying the network structure and reducing the investment cost. The technical effect of data communication performed by users on the PS domain.

2. At the same time, because the technical solution provided in the embodiment of the present application has the technical characteristics of convenient maintenance, it can also effectively solve the technical problem of complex network maintenance in the prior art, and then achieve the technical effect of simple and convenient maintenance.

Description of drawings

FIG. 1 is a network structure diagram of data communication between CS domain and PS domain in the prior art;

Fig. 2 is the module structural diagram of media server in the embodiment of the present application;

Fig. 3 is a network structure diagram of an IMS system comprising a media server in Fig. 2;

FIG. 4 is a flowchart of a method for processing ADD signaling by a media server in an embodiment of the present application;

FIG. 5 is a flowchart of a method for processing MOD signaling by a media server in an embodiment of the present application;

FIG. 6 is a flowchart of a method for processing SUB signaling by a media server in an embodiment of the present application;

FIG. 7 is a specific process diagram of implementing the CRBT service by a CS domain user.

detailed description

Please refer to Figure 3, which is a structural diagram of the IMS network including the media server in Figure 2, in the IMS network, the MGCF receives the service request of the CS domain user through the trunk gateway, and controls and manages the MS based on the service request , and other devices in the network, such as file servers, etc., to realize data communication between CS domain users and PS domain users.

Compared with the network structure diagram in the prior art, the technical solution provided in the embodiment of the present application can enable users in the CS domain to directly connect to the MS without going through an intermediate device such as an MG or VIG, and then from the IMS network Obtain data business services, such as: ring tones, multimedia messages, video and audio media file playback, etc.

The implementation principle, specific implementation process and corresponding beneficial effects of the technical solutions in the embodiments of the present application will be described in detail, clearly and completely in conjunction with each of the accompanying drawings in the description.

As shown in Figure 2, it is a module structure diagram of the media server of the embodiment of the present application, and the media server includes:

PPM (Protocol Preduce Module, protocol processing module), configured to accept the first service request based on the H.248 protocol sent by the CS domain user sent by the MGCF, wherein the service corresponding to the first service request is Multimedia data services, such as color ring tones, multimedia messages, audio and video, etc.; the service corresponding to the first service request can also be related storage services in the online file storage system, such as storing files, downloading files, uploading files, etc. The service corresponding to the first service request also includes the service equivalent to the above embodiment that is directly derived or deduced by those skilled in the present application according to the above embodiment.

In the specific implementation process, the PPM completes the connection between the master end and the slave end of the H.248 protocol according to the first service request. Assuming that the first service request is a CRBT service request, the connection between the master end and the slave end is It is the interconnection based on the H.248 protocol between the PPM module in the MS and the CRBT AS system, and can realize functions such as encoding and decoding and service driving based on the protocol. Based on the first service request, the PPM may also connect the first service request to the MTP link of E1 for transmission, wherein the MTP link of E1 is a connection channel supporting transmission in circuit domain transmission mode.

MDM (Media Destruct Module, media issuing module), configured to obtain the corresponding first multimedia stream based on the IP domain based on the first service request.

Taking the CRBT service as an example, in the specific implementation process, it is: the first service request is a CRBT service request, and the MDM obtains the IP domain-based IP domain-based IP domain id of the CRBT service request from the AS system according to the CRBT service request. CRBT multimedia information, the CRBT multimedia information is the first multimedia stream, of course, when the first service request is other services, such as: MMS, audio and video, file storage, voice recognition, etc., The first multimedia stream corresponds to: MMS files, audio and video files, stored files, and audio multimedia and so on.

In the process of obtaining the first multimedia stream based on the IP domain, the MDM implements the NAT forwarding function of the IP protocol through an internal hardware network processor.

Specifically, it includes E1 media after internal VOIP (Voice over Internet Protocol,) processing, wherein the E1 media is multimedia that can be used for circuit domain transmission, that is, the second multimedia stream, and the second multimedia The forwarding of the flow to the external destination route also includes the issuance of the service medium of the MS from the external route to the internal VOIP module, so as to achieve the purpose of directly serving the TS channel of the E1.

The VOIP module is configured to receive the first multimedia stream and convert it into a second multimedia stream based on E1 bearer.

Also take the CRBT service as an example. In the specific implementation process, the CRBT ring tone of the first multimedia stream is based on the IP domain, and the VOIP module converts the CRBT ring tone into a CRBT ring tone based on the circuit domain, that is, the second Multimedia streaming. Wherein, the conversion from the first multimedia to the second multimedia is completed by a new type of DSP sub-card, the DSP sub-card contains 4 main processing DSP chips, each DSP chip contains 3 DSP For processing cores, core 0 controls the forwarding of DSP signaling to core 1 and core 2, and the core 1 and core 2 complete media processing.

When converting the first multimedia to the second multimedia, it is necessary to encapsulate the media stream information into an E1 bearer packet that can be transmitted on the circuit domain, and then encapsulate the media stream information into a In the process of transmitting E1 bearer packets, the following two methods can be used:

One, according to the MTP link transmission protocol of E1, after decoding, the media stream in the IP domain is marked as an E1 bearer stream, so that it can be transmitted on the E1 physical link;

Second, adopt the encapsulation method conforming to the 324M format to encapsulate the audio and video stream or RTP stream of 3G media.

A CEM (Circuit Exchange Module, circuit exchange module), receives the second multimedia stream, and provides the second multimedia stream to the called user equipment based on the first service request.

Also take the CRBT service as an example. In the specific implementation process, the CEM module receives the CRBT ring tone based on the IP domain converted by the VOIP module into the CRBT ring tone based on the circuit domain, and makes a call according to the first service request, that is, in the CS domain. users who make calls, provide ringtone services for users who make calls.

At the same time, the CEM can also realize the channel exchange and management functions between the CS domain user access MS channel and the IP domain user access channel, and the connection management function of the LC (Local Connect, local board connection) network. Wherein, the connection management of the LC network is mainly realized through the control of the internal E1 switching chip. The internal hardware composed of the E1 switching chip and DSP is connected to the HW interface of the DSP of the VOIP processor at one end of the 32M HW line, and the other end is connected to the E1 The HW interface of the switch chip, the E1 access unit and the VOIP processing unit are fixedly connected according to data configuration rules.

The data management module DMM (Data Manage Module), accepts the control message from the PPM, implements the protocol in the media server, media stream processing and manages the circuit domain resources, IP resources and DSP resources of the media server.

In the specific implementation process, the data management module is used to realize the management of protocols such as H.248 and RTP in the server according to the control information from the PPM, and the first multimedia stream based on the IP domain and the first multimedia stream based on the circuit domain The corresponding processing of the second multimedia stream is also used to complete the management of various resources including DSP resources, IP resources, and circuit domain resources.

Wherein, the various resource management tasks include: in the process of providing services by the MS, realizing the allocation of the DSP resources, the IP resources, and the circuit domain resources, and the operation of data on the circuit channel; After the MS completes providing the service, the resources such as the DSP resources, the IP resources, and the circuit domain resources are recovered, and in the resource management, the circuit domain resources are directly connected with the internal LC network The VOIP processing resources adopt a fixed connection mode. Through the fixed connection mode, when the circuit domain resources 1-n are connected to the VOIP processing resources 1-n one by one through the LC network, the DMM only needs to do the A 1-to-1 replacement is enough instead of replacing each one, which improves the efficiency of replacement; the RTP resource of the externally connected network port uses the external network port on the internal switch board to save the hardware of the media server Slot resources.

Through the above-mentioned embodiments of the present invention, the following technical effects can be achieved:

According to the first service request, directly obtain the corresponding media service from the IMS, and convert the first multimedia stream based on the IP domain into the second multimedia stream based on the circuit domain through the processing between various modules in the MS , solve the technical problem of adding intermediate equipment MG or VIG in the prior art, and achieve the technical effect that CS domain users can directly transmit multimedia information with the media server under the premise of simplifying the network structure and reducing investment costs.

As shown in Figure 4, it is a flow chart of the method for processing ADD signaling in the embodiment of the present application. In the specific implementation process, the method can be implemented in different hardware devices, for example: the method can be applied to include In the media server in the IP multimedia network of media gateway control equipment, described method comprises the steps:

Step 401: Receive the ADD signaling based on the H.248 protocol sent by the media gateway control device, and establish a context CONTEXT based on the ADD signaling.

Wherein, the ADD signaling includes the circuit domain terminal ID. In practical applications, the ADD signaling may also include: the sending and receiving mode of the RTP end, the voice compression algorithm or video compression algorithm used, and the m line includes the service Whether the media requirement of the object is audio or video, the default packaging duration, the jitter range requirements of the network, whether the attribute information of IPV4 or IPV6 is used, etc. In short, those skilled in the technical field of this application can determine the ADD signal according to the requirements. order includes the type of information.

Step 402: Convert the terminal ID into a circuit domain system logical node number in the media server, and then assign corresponding relay terminal resources to the circuit domain system logical node number.

In a specific implementation process, after the step 402, the following operations can also be performed:

Based on the resource management interface of the data management module, request the internal port IP and PORT number of the VOIP module in the media server corresponding to the relay terminal resource, wherein, for the internal port IP and PORT number, in During the allocation process, it can be allocated according to many rules, for example, according to the binary corresponding rules of data configuration. Of course, those skilled in the technical field to which the present application belongs may also use other rules equivalent to the binary correspondence rule for allocation.

Step 403: Open the circuit domain channel and voice conversion channel corresponding to the E1 of the circuit switching module in the media server based on the logical node number of the circuit domain system.

In a specific application, the embodiment of the present application may also perform the following steps after the step 30:

The audio-video compression algorithm of the local end of the VOIP module is set, the audio-video compression algorithm; wherein, the audio-video compression algorithm can be algorithms such as G.711A, G.711U or G.729;

Set the packet duration jitter abnormal alarm attribute of the local end of the VOIP module; wherein, the alarm attribute may specifically include an abnormal alarm flag, a jitter threshold, and an alarm code.

Add the terminal into the context CONTEXT, and record the corresponding relationship between the terminal and the logic node number of the circuit domain system in the data area of the protocol processing module of the media server.

Step 404, based on the logical node number of the circuit domain system, apply for RTP resources through the resource management interface of the data management module in the media server;

Step 405, opening the RTP channel in the media issuing module in the media server;

Wherein, after applying for the RTP resource, it also includes: obtaining the internal IP, internal PORT, external IP, and external PORT of the RTP resource, and recording the corresponding relationship between the logical node number of the circuit domain system and the logical node number of the RTP system.

After the RTP channel in the media issuing module is opened, it also includes:

Set the sending and receiving status of the RTP terminal;

Decide whether to use IPV4 to encapsulate the media package or to use IPV6 to encapsulate the media package;

The RTP terminal is added to the context CONTEXT, and the PPM adds the RTP terminal number to the created context; and records the corresponding relationship between the RTP terminal and the logic node number of the circuit domain system in the data area of the protocol processing module.

The corresponding relationship between the recorded RTP terminal and the logical node number of the circuit domain system can be dynamically selected, that is, when the media channel is established, an idle RTP port is selected, and the corresponding relationship between the RTP port and the logical node number of the circuit domain system is dynamically selected. Relationships are recorded in the DMM;

Step 406, returning a response message for responding to the ADD signaling to the media gateway control device;

As shown in Figure 5, it is a flow chart of the method for processing MOD signaling in the embodiment of the present application. In the specific implementation process, the method can be implemented in different hardware devices, for example: the method can be applied to include In the media server in the IP multimedia network of media gateway control equipment, described method comprises the steps:

Step 501, receiving MOD signaling based on the H.248 protocol sent by the media gateway control device, the MOD signaling includes context ID, RTP terminal;

Wherein, the MOD signaling further includes: the remote RTP IP address and port number negotiated between the media gateway control device and the message interworking gateway, the remote voice compression algorithm, and the remote packaging duration.

Step 502, query the RTP system logical node number corresponding to the RTP terminal recorded in the context data area of the H.248 protocol according to the context ID;

Step 503, according to the logical node number of the RTP system, set the remote RTP IP address and port number corresponding to the RTP resource of the data management module in the media server;

Wherein, described far-end RTP IP address and port number are external service address and port number of described media server; Described far-end speech compression algorithm is the speech compression algorithm of described media server; Described far-end packing duration is the packaging duration of the media server.

Step 504, according to the logical node number of the RTP system, search for the logical node number of the circuit domain system corresponding to the data area in the protocol processing module in the media server, and set the logical node number in the media server based on the logical node number of the circuit domain system. The properties of the port corresponding to the VOIP module;

Step 505, record the remote RTP IP address of the RTP resource, the port number, and the attribute of the corresponding port of the VOIP module into the data area in the protocol processing module in the media server, and return the response to the media gateway control device A response message of the MOD signaling.

As shown in Figure 6, it is a flow chart of the method for processing SUB signaling in the embodiment of the present application. In the specific implementation process, the method can be implemented in different hardware devices, for example: the method can be applied to include In the media server in the IP multimedia network of media gateway control equipment, described method comprises the steps:

Step 601, receiving the SUB signaling based on the H.248 protocol sent by the media gateway control device,

Wherein, the SUB signaling includes the context ID, the RTP terminal and the circuit domain terminal;

Step 602, based on the context ID, query the RTP system logical node number corresponding to the RTP terminal and the circuit domain system logical node number corresponding to the circuit domain terminal recorded in the context data area of the H.248 protocol;

Step 603, based on the logical node number of the RTP system, close the RTP channel in the media server;

In a specific implementation process, after the step 603, the following operations may also be performed:

Based on the logical node number of the RTP system, by calling the data management interface of the data management module in the media server, releasing the logical node number resource of the RTP system, and setting the data management resource channel corresponding to the logical node number of the RTP system is idle.

Step 604, based on the logical node number of the circuit domain system, close the circuit domain channel and the voice conversion channel;

In a specific implementation process, after the step 604, the following operations may also be performed:

Based on the logical node number of the circuit domain system, by calling the data management interface of the data management module in the media server, release the resource of the logical node number of the circuit domain system, and manage the data corresponding to the logical node number of the circuit domain system The resource channel is set to idle state.

Step 605: Return a response message for responding to the SUB signaling to the media gateway control device, and report the statistical media flow information.

Referring to FIG. 7 , the specific process of how the user in the CS domain implements the CRBT service will be described in detail below by taking CS domain users using the CRBT service in the IMS as an example.

Step 1, after the calling user UE1 goes off-hook and dials, the MGCF receives the ISUP initial address message (IAM) of the calling switch, and then sends an Add message to the CSAS (Circuit Switched Domain Access System, Circuit Switched Domain Access System) of the MS , wherein the ADD message includes:

Create a new context in CSAS, and add the incoming trunk and RTP terminal number to the context, and set the RTP Mode to Receiveonly, and set the voice compression algorithm;

Wherein, the voice compression algorithm can adopt compression algorithms such as G.711A, G.711U, G.729, 324M;

Step 2, the CSAS allocates resource RTP1 for the RTP required to Add, and responds to the MGCF with a Reply message, wherein the Reply message includes: the IP address of the RTP1, the voice compression algorithm used, and the RTP port number, etc. ;

Step 3, the MGCF distributes the calling UE1 SDP offer; the INVITE request is routed to the called user UE2 after passing through the CRBT application server;

The called user UE2 rings, sends a 180 response, and carries UE2 SDPanswer corresponding to the UE1 SDP offer;

Step 4, the CRBT application server applies for CRBT media resources to the MRF (Media Resource Function) of the MS, and the CRBT application server route 180 responds to the MGCF, carrying the MRBT SDPanswer in the response;

Step 5, the MGCF sends a Mod message to the CSAS of the MS, and sets the remote RTP address and port number, voice compression algorithm, etc.;

Step 6, the CSAS returns a Reply message to the MGCF;

Step 7, the MGCF converts the 180 response into an ACM (Address Complete Message) and sends it to the UE1; the UE1 confirms the 180 response through PRACK; the UE2 responds to the PRACK;

Step 8, the CRBT application server sends an INFO request to instruct the MRF to play the CRBT;

Step 9: After the called UE2 goes off-hook, the CRBT application server uses UPDATE to initiate a media update to the MGCF; at the same time, the CRBT application server sends a BYE request to the MRF to end the CRBT playing;

Step 10, the MGCF sends a MOD message to the CSAS, and modifies its Mode to SendReceive;

Step 11, the CSAS returns a Reply message to the MGCF;

Step 12, the calling UE1 and the called UE2 start talking;

Step 13, the calling UE1 or the called UE2 hangs up and ends the call;

Step 14, the MGCF sends a SUB message to the CSAS to release the called relay and RTP;

Step 15, the CSAS returns a Reply to the MGCF, which reports the media flow statistics of the call,

Wherein, the media stream statistical information includes: media retention duration, calling party, called party, and file name information to be played.

Through the embodiments in this application document, at least the following technical effects can be achieved:

1. Through the processing of ADD signaling, the allocation of circuit domain and relay terminal resources and the opening of circuit domain channels, RTP channels and voice conversion channels are solved; and the technical details involved in the above processing process are set, such as: RTP sending and receiving Mode, compression algorithm mode, packaging time, network jitter range and abnormal alarm attributes, network protocol standard and other related parameters, to achieve the technical effect of preparing for the transmission of multimedia information streams on the channel and preparing for the corresponding parameter details.

2. Through the processing of MOD signaling, the problem of setting the SLN of the RTP terminal and RTP IP address, port number, port attribute corresponding to the VOIP module, remote compression algorithm, and remote packaging time are solved, and the media server has achieved The technical effect of the corresponding logical interface position is obtained between each module.

3. Through the processing of SUB signaling, the problem of closing the circuit domain channel, RTP channel, and voice conversion channel corresponding to the SLN of RTP and the SLN of the circuit domain is solved, and channel resources and in the circuit domain are provided for the next media service. Following resources etc.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (3)

1. a kind of media server, the media server is used for the IP multi-media networks for including media gateway controlling equipment In, it is characterised in that including:

Protocol process module, the first business based on H.248 agreement sent for receiving the media gateway controlling equipment Request, first service request are sent to including for the media gateway controlling equipment for calling subscriber equipment in the cs domain There is the request of called user information, be additionally operable to that the calling subscriber equipment is accessed into the IP based on first service request Multi-media network；

Media issue module, for based on first service request, acquisition is corresponding with first service request to be based on IP First media stream in domain；

VOIP modules, for receiving first media stream, and it is converted into the second media stream based on E1 carryings；

Circuit switching module, for receiving second media stream, and first service request is based on, to the called use Family equipment provides second media stream；

The media server is used for：The ADD based on H.248 agreement sent by the media gateway controlling equipment is received to believe Order, and context CONTEXT is established based on the ADD signalings, wherein, include circuit domain terminal ID in the ADD signalings；Will The Termination ID is converted to the circuit domain system logic node serial number in the media server, then to the circuit domain system The terminal resource of relaying corresponding to logical node numbering distribution；The matchmaker is opened based on the circuit domain system logic node serial number Circuit domain passage corresponding to the E1 of circuit switching module and voice ALT-CH alternate channel in body server；Patrolled based on the circuit domain system Node serial number is collected, passes through the resource management interface of data management module in the media server, applies for RTP resource；Open institute State media in media server and issue RTP passages in module；Returned to the media gateway controlling equipment described for responding The response message of ADD signalings.

2. media server as claimed in claim 1, it is characterised in that also include：

Data management module, it is connected with the protocol process module, disappears for receiving the control from the protocol process module Breath, for agreement in the multimedia server, the circuit money of the configuration of media stream process, and the management media server Source and IP resources, DSP resources.

3. media server as claimed in claim 2, it is characterised in that the VOIP modules are in the Media Stream based on IP domains When, encapsulate in the following way：According to E1 MTP link transmission agreements, by the Media Stream in the IP domains, after decoding, E1 is broken into Carrying stream, to be transmitted on E1 physical links.