CN101360091B - Apparatus, system and method realizing session initial protocol terminal conference accessing - Google Patents
Apparatus, system and method realizing session initial protocol terminal conference accessing Download PDFInfo
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- CN101360091B CN101360091B CN2007101371333A CN200710137133A CN101360091B CN 101360091 B CN101360091 B CN 101360091B CN 2007101371333 A CN2007101371333 A CN 2007101371333A CN 200710137133 A CN200710137133 A CN 200710137133A CN 101360091 B CN101360091 B CN 101360091B
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Abstract
The invention discloses an apparatus, a system and a method for realizing session initiation protocol terminal enrollment, which are applied to an H.323 session system, comprising: an SIP terminal access apparatus that can be connected with an SIP terminal is arranged in the session system, the SIP terminal access apparatus receives H.323 protocol messages which are sent from the H.323 side to the SIP terminal for protocol conversion and address resolution and are converted into SIP protocol messages for being sent to the corresponding SIP terminal; and receives SIP protocol messages which are sent from the SIP terminal side to the H.323 side for protocol conversion and are converted into H.323 protocol messages for being sent to the corresponding equipment at the H.323 side through the completion of address resolution through the interaction with a GK. The invention realizes the access to the SIP terminal, and the SIP terminal access apparatus realizes functions of SIP terminal enrollment and communications with the H.323 terminal through interfaces with the SIP terminal, the GK and an MCU.
Description
Technical field
The present invention relates to field of multimedia communication, be meant a kind ofly in conference system H.323 especially, realize the sip terminal access device of session initiation protocol (SIP) terminals joining the conference, H.323 conference system and sip terminal admission method.
Background technology
H.323 being one to be enclosed within the standard that real-time audio, video and data communication are provided on the Packet Based Network, is the serial protocols that multimedia communication is provided on the diverse network part H.32x that ITU-T works out.H.323 agreement is generally believed it is at present support voice, image and the most ripe agreement of data service on Packet Based Network.This agreement is laid a good foundation based on the media product co-development of Local Area Network, metropolitan area network (MAN) for commercial and personal user.
H.323 present a lot of commercial conference systems adopt, and agreement communicates, basic H.323 conference system comprises: gatekeeper (GK, Gatekeeper), multipoint control unit (MCU, Multi-Controller Unit), H.323 terminal and conference management support system.Wherein,
GK provides resource management functions such as access control, Bandwidth Management, district management, can manage MCU, terminal H.323;
MCU is the tandem treatment facility, and the call setup and the controlled function of video conference in many ways are provided, and receives audio frequency, video and the data flow of self terminal or other MCU, handles these Media Streams and they are sent back to terminal, other MCU;
H.323 terminal has call setup and release, and meeting field picture, the collection of voice, coding are unpacked, decoded, functions such as output the image, the audio medium stream that receive;
Conference management support system mutual by with GK, MCU realized the full-range unified control of meeting, unified resource scheduling and management.
Yet the H.323 conference system of existing standard only provides the H.323 point-to-point video communication and the multipoint conference function of terminal, can't support the access of sip terminal, and the concrete problem that exists is as follows:
(1) H.323 the GK in the system can't discern the log-on message of sip terminal, can't authenticate sip terminal;
(2) H.323 the MCU in the conference system can't dispatch the resource of sip terminal;
(3) H.323 the H.323 terminal in the conference system can't be directly and sip terminal communicate.
The conference system of agreement can not insert the terminal of supporting Session Initiation Protocol owing to adopt H.323, and this has brought some problems for the development of system, such as:
The spendable terminal of user only is terminal H.323, and range of choice is little, causes user's popularity rate low;
Because Session Initiation Protocol is the main flow signaling protocol of NGN, IMS system, therefore support that the product of Session Initiation Protocol is more and more abundanter, at user option sip terminal kind also increases thereupon, but these terminals are generally relatively poor with the interoperability of system H.323;
The relevant international standard of SIP multimedia conferencing will be more and more perfect based on the conference capability of Session Initiation Protocol just in formulation process, and H.323 the advantage of agreement on conference capability will weaken gradually;
The user is after the demand of basic meeting is met, and hope can be used more value-added service, but utilizes comparatively difficulty of H.323 protocol development value-added service, and Session Initiation Protocol is very suitable for carrying out the exploitation of various value-added services.
Summary of the invention
In view of this, the present invention proposes a kind of device, system and method for realizing session initial protocol terminal conference accessing, realizes that sip terminal joins in the conversational system of agreement H.323.
The invention provides a kind of sip terminal access device of in conference system H.323, realizing the affiliation of session initiation protocol sip terminal based on above-mentioned purpose, comprising:
Call processing module, be used for the H.323 transmitting-receiving of the signaling message between the side apparatus and described sip terminal access device, and receiving the sip terminal side when mailing to the Session Initiation Protocol message of side H.323, to the H.323 gatekeeper GK initiation access request of side, and receiving the access confirmation message that described gatekeeper GK returns, this access confirmation message carries the terminal called address information that described gatekeeper GK obtains according to the called number parse addresses;
Protocol conversion module is used to carry out signaling message in the H.323 conversion between agreement and the Session Initiation Protocol;
The sip address parsing module, the address translation that is used for sip terminal that signaling message is comprised becomes the Network Transmission layer address;
The sip agent module is used for the signaling message transmitting-receiving between sip terminal side and the described sip terminal access device, and the signaling message that mails to the sip terminal side is carried out addressing; And
H.323 protocol stack module is used to provide H.323 agreement support;
Session Initiation Protocol stack module is used to provide the Session Initiation Protocol support.
This device further comprises:
The state exchange module, be used to safeguard the state of sip terminal access device, behind the signaling message of receiving, according to the corresponding relation of signaling message that sets in advance and state, trigger state exchange, make correlation module in the sip terminal access device carry out corresponding function under this state.
This installs described state and comprises: idle condition, wait for the access authentication state, wait for ringing condition, H.245 interaction mode and connection status.
This device further comprises: the SIP Registering modules that accesses terminal is used for carrying out the authentication registration of sip terminal access device to side H.323.
This device further comprises: the SIP Registering modules, be used to receive the register requirement of sip terminal, and sip terminal is registered, authenticated.
This device further comprises: sip terminal access device management, configuration interface module are used for carrying out providing the operation interface of the management and the configuration of sip terminal access device alternately with the conference management support system of conference system H.323.
This installs described sip agent module and carries out the stateful proxy function is arranged, the content before the request of transmitting in the overwrite request message, all state informations that storage ends when conversation end when session is set up.
H.323 and the map addresses between the SIP, message maps, message parameter mapping, message sequence mapping this installs described protocol conversion module and is used to finish signaling message.
The invention provides a kind of H.323 conference system based on above-mentioned purpose, include gatekeeper GK, multipoint control unit MCU, H.323 terminal and conference management support system, also comprise: the sip terminal access device is connected with sip terminal;
Described sip terminal access device receives the H.323 protocol message that side H.323 mails to the sip terminal side, carries out protocol conversion and address resolution, is converted to Session Initiation Protocol message, sends to corresponding sip terminal according to the address of resolving; And receive the sip terminal side and mail to the H.323 Session Initiation Protocol message of side, the Session Initiation Protocol message conversion is protocol message H.323, and initiate access to described gatekeeper GK and ask, receive the access confirmation message that carries the terminal called address information from described gatekeeper GK, and described H.323 protocol message is sent to corresponding H.323 side apparatus according to described terminal called address;
Described gatekeeper GK receives the access request that described sip terminal access device sends, and according to the called number parse addresses, and sends the access confirmation message that carries the terminal called address information to described sip terminal access device.
The described sip terminal access device of this system is also judged the message that receives, if do not need protocol conversion, then directly carries out address resolution, according to the destination address of resolving this forwards is gone out.
The described sip terminal access device of this system also is used to receive the registration of sip terminal, sip terminal is registered, is authenticated, and safeguard the sip terminal state of user.
The described sip terminal access device of this system also is used for carrying out the authentication registration of sip terminal access device to the gatekeeper GK of side H.323.
The described sip terminal access device of this system also is used for carrying out providing the operation interface of the management and the configuration of sip terminal access device alternately with the conference management support system of conference system H.323.
The described sip terminal access device of this system is also called out and control information with the multipoint control unit MCU interactive conference of side H.323, finishes the exchange of foundation, release and the video media stream of the media channel between sip terminal access device and the MCU.
Comprise in the described sip terminal access device of this system:
Call processing module is used for the H.323 transmitting-receiving of the signaling message between the side apparatus and described sip terminal access device, and the signaling message of side apparatus carries out addressing to mailing to H.323;
Protocol conversion module is used to carry out signaling message in the H.323 conversion between agreement and the Session Initiation Protocol;
The sip address parsing module, the address translation that is used for sip terminal that signaling message is comprised becomes the Network Transmission layer address;
The sip agent module is used for the signaling message transmitting-receiving between sip terminal side and the described sip terminal access device, and the signaling message that mails to the sip terminal side is carried out addressing; And
H.323 protocol stack module is used to provide H.323 agreement support;
Session Initiation Protocol stack module is used to provide the Session Initiation Protocol support.
Also comprise in the described sip terminal access device of this system: the state exchange module, be used to safeguard the state of sip terminal access device, behind the signaling message of receiving, corresponding relation according to signaling message that sets in advance and state, trigger state exchange, make correlation module in the sip terminal access device carry out corresponding function under this state.
Also comprise in the described sip terminal access device of this system: the SIP Registering modules that accesses terminal is used for carrying out the authentication registration of sip terminal access device to side H.323.
Also comprise in the described sip terminal access device of this system: the SIP Registering modules, be used to receive the register requirement of sip terminal, sip terminal is registered, authenticated.
Also comprise in the described sip terminal access device of this system: the management of sip terminal access device, configuration interface module, be used for carrying out providing the operation interface of the management and the configuration of sip terminal access device alternately with the conference management support system of conference system H.323.
The invention provides a kind of method that in conference system H.323, realizes the affiliation of session initiation protocol sip terminal based on above-mentioned purpose, H.323 in the conference system sip terminal access device is being set, and is being connected with sip terminal;
H.323 the side apparatus signaling message that will mail to sip terminal is sent to described sip terminal access device, the sip terminal access device carries out H.323 arriving the conversion and the address resolution of Session Initiation Protocol to this signaling message, be converted to Session Initiation Protocol message, send to corresponding sip terminal according to the destination address of resolving;
Mail to the H.323 signaling message of side apparatus for sip terminal, the sip terminal access device carries out SIP to the H.323 conversion of agreement to this signaling message, be converted to H.323 protocol message, and to the H.323 gatekeeper GK initiation access request of side, after described gatekeeper GK receives request, according to the called number parse addresses, and sending the access confirmation message that carries the terminal called address information to described sip terminal access device, described sip terminal access device sends to corresponding H.323 side apparatus according to described terminal called address with described signaling message.
The process that this method sip terminal receives H.323 side calling may further comprise the steps:
H.323 after the gatekeeper GK of side is sip terminal by the adress analysis called number, initiate to connect signaling to the sip terminal access device; The sip terminal access device initiates to insert request as called end points to GK, and GK receives that inserting the request back sends access confirmation message to the sip terminal access device; The sip terminal access device is resolved called number, and current calling is transferred to corresponding sip terminal.
This method sip terminal may further comprise the steps in the process of the multipoint conference that adding multipoint control unit MCU convenes:
A.H.323 side multipoint control unit MCU obtains called call signaling address, sends to the sip terminal access device and sets up call request message;
B.SIP terminal access device sends call request message to affiliated GK;
The C.GK loopback represents to allow the affirmation message of sip terminal access device call accepted;
D.SIP terminal access device sends to called SIP terminal and invites the request message that adds;
The ring of E.SIP terminal also send to add response message to the sip terminal access device;
F.SIP terminal access device resolves to the H.323 response message loopback of agreement with described response message and gives MCU;
G.SIP terminal use off-hook, sip terminal sends the off-hook response message to the sip terminal access device;
H.SIP terminal access device resolves to the H.323 connection of agreement with the off-hook response message and sets up message;
I.SIP terminal access device sends expression to sip terminal and confirms to connect the message of setting up, and MCU sets up conversation with the sip terminal both sides and is connected.
The multipoint conference process that the described sip terminal adding of this method MCU convenes is the short calling flow process, steps A is described to be set up and comprises short calling parameter f aststart in the call request message and equal True, and open logical channel OLC message, OLC message comprises the employed forward direction of described MCU and oppositely media channel and media control channel parameter number and channel information;
Carry the SDP message that to carry out media negotiation in the request message that the described invitation of step D adds;
Carry the SDP message that consults in the message of the described off-hook response of step G;
The described connection of step H is set up and is comprised short calling parameter f aststart in the message and equal True, and opens logical channel OLC message, and OLC message comprises forward direction that SDP parses and oppositely media channel and media control channel parameter number and channel information.
The multipoint conference process that the described sip terminal adding of this method MCU convenes is the normal call flow process, further comprises between step H and the I:
It is mutual that sip terminal access device and MCU carry out capability set;
Sip terminal access device and MCU carry out principal and subordinate's deterministic process;
Sip terminal access device and MCU open logical channel respectively;
Carry the SDP message that to carry out media negotiation in the message of the described off-hook response of step G;
Carry the SDP message that consults in the message that the affirmation of expression described in step I connection is set up.
The described steps A of this method takes a step forward and comprises:
MCU sends the request message that carries out access authentication and address resolution to affiliated GK;
GK finishes address resolution and access authentication, and response message is confirmed in loopback.
The sip terminal access device further comprises after affiliated GK sends call request message among this method step B: the sip terminal access device represents to call out ongoing response message to the MCU loopback.
Sip terminal further comprises after receiving the request message that described invitation adds among this method step D:
Sip terminal sends expression to the sip terminal access device and calls out ongoing response message; The sip terminal access device resolves to expression with this response message and calls out ongoing response message loopback to described MCU.
Sip terminal access device described in this method step I sends to sip terminal and further comprises after expression is confirmed to connect the message of setting up: if need to charge, then the sip terminal access device sends the sip terminal charging message to GK.
H.323, this method sip terminal access device may further comprise the steps in the side registration process:
H.323 the sip terminal access device sends the login request message of agreement and registers to GK;
GK returns to the sip terminal access device by registration reply message with registering result.
By callSignalAddress, rasAddress, terminalAlias field call signaling port, RAS port and the terminal alias to GK registration sip terminal access device, the terminalType field of rrq message is gateway to this method sip terminal in described login request message.
This method sip terminal authentication registration process may further comprise the steps:
The a1.SIP terminal sends the login request message of Session Initiation Protocol to the sip terminal access device;
A2.SIP terminal access device checks whether authentication information is arranged in this register requirement, if reception is the register requirement of not carrying authentication information, the sip terminal access device sends the response message that prompting should replenish authentication information to sip terminal, enters step a3; If contain authentication information in the register requirement that receives, then directly enter step a4;
The register requirement that the a3.SIP terminal regenerates the Session Initiation Protocol that carries authentication information sends to the sip terminal access device;
A4.SIP terminal access device extracts this authentication information and authenticates, and after authentication was passed through, the sip terminal access device returned response message and gives sip terminal.
This method sip terminal is dropped by the wayside the process of session, may further comprise the steps:
The b1.SIP terminal sends the request message that withdraws from session to the sip terminal access device;
If b2. opened H.245 media control channel, sip terminal access device and multipoint control unit MCU send mutually and close the logical channel order, enter step b3; If do not open H.245 media control channel, then direct execution in step b4;
B3.SIP terminal access device and MCU send end session command mutually;
B4.SIP terminal access device sends Release complete to MCU;
B5.SIP terminal access device withdraws from the response message of session to the sip terminal loopback;
B6.SIP terminal access device sends the request message of expression end of conversation to GK;
B7.GK is to sip terminal access device return response message;
B8.MCU sends the request message of expression end of conversation to GK;
B9.GK is to MCU return response message.
From above as can be seen, the device of realization session initial protocol terminal conference accessing provided by the invention, system and method, by increase access that special-purpose sip terminal access device realizes sip terminal H.323 in the conversational system of agreement and with H.323 terminal communication.Realize the sip terminal affiliation by the interface of sip terminal access device and sip terminal, GK, MCU, and with terminal communication process H.323 in Signalling exchange.The sip terminal access device sends log-on message to GK, carries the information such as type, RAS port, call signaling port of oneself in the log-on message, inserts H.323 system as gateway H.323; The sip terminal access device can provide sip terminal registration and authentication service; And MCU dispatches sip terminal by the sip terminal access device.Thereby make sip terminal can add the multipoint conference of convening by the MCU end, that can realize sip terminal and terminal H.323 point-to-pointly looks the audio frequency intercommunication, sip terminal can also be dropped by the wayside meeting, in addition, be the manageability of effective supporting business, the present invention also provides functions such as sip terminal management, charging.
Description of drawings
Fig. 1 can realize the H.323 conference system structural representation of sip terminal affiliation for the embodiment of the invention;
Fig. 2 is the structural representation of embodiment of the invention sip terminal access device;
Fig. 3 is that embodiment of the invention sip terminal access device arrives the H.323 schematic flow sheet of side registration;
Fig. 4 is the schematic flow sheet of the authentication registration of embodiment of the invention sip terminal;
Fig. 5 adds the multipoint conference schematic flow sheet that MCU convenes for embodiment of the invention sip terminal;
Fig. 6 adds the multipoint conference schematic flow sheet that MCU convenes for the embodiment of the invention adopts the sip terminal of short calling flow process;
Fig. 7 is the embodiment of the invention sip terminal schematic flow sheet of withdrawing the membership midway.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
Referring to shown in Figure 1, the H.323 conference system that present embodiment is realized the sip terminal affiliation comprises based on conference system substantially H.323:
H.323 terminal 103, have call setup and release, and meeting field picture, the collection of voice, coding are unpacked, decoded, functions such as output the image, the audio medium stream that receive;
Conference management support system 104, mutual by with GK 101, MCU 102 realized the full-range unified control of meeting, unified resource scheduling and management;
In addition, present embodiment has also increased the sip terminal access device 105 of supporting the sip terminal affiliation on the said system basis, this device 105 has gateway function, can realize the H.323 conversion of agreement and Session Initiation Protocol, this device 105 is supported registration, the authentication of sip terminal 106 simultaneously, can initiate or transmit and mail to the H.323 calling of terminal 103, also can transmit from the H.323 calling of terminal 103.
For convenience among the present invention with GK 101, MCU 102, H.323 terminal 103, conference management support system 104 etc. H.323 the original equipment of conference system be called the H.323 equipment of side, the equipment of the employing Session Initiation Protocol of not drawing among sip terminal 106 and the figure such as sip proxy server is called the equipment of SIP side.
As shown in Figure 1, sip terminal access device 105 links to each other with sip terminal 1～N106 by passage I1, links to each other with conference system H.323 by passage I2, I3, I4, and the concrete data of passage I1, I2, I3, I4 transmission are as follows:
Passage I1:SIP terminal 106 is registered and is authenticated to sip terminal access device 105, and sip terminal access device 105 is safeguarded the sip terminal state of user;
And, sip terminal access device 105 transmit from or mail to the H.323 calling of terminal 103.
Passage I2: (flow process of opening an account is front-end business receiving system-conference management support system-sip terminal access device when the sip terminal user opens an account, it is the action that the user triggers, what preserve is user-dependent data), conference management support system 104 is put into user data in the sip terminal access device 105, sip terminal access device 105 is converted into the inner order of distributing telephone numbers with the user data that receives, and finishes opening an account of sip terminal user; And conference management support system 104 also can manage and dispose the sip terminal access device by the I2 passage.
Passage I3:SIP terminal access device 105 is registered to GK 101 as gateway.
In addition, the calling that sip terminal 106 is initiated is through sip terminal access device 105, and sip terminal access device 105 is not finished address resolution, but forwards calling to H.323 side (the H.323 side of sip terminal and the explanation of SIP side see below); In side H.323, sip terminal access device 105 is not finished address resolution yet, but initiates to insert request to GK 101.GK 101 receives the access request of sip terminal access device 105, according to the called number parse addresses, be sent to corresponding H.323 terminal equipment then, send access confirmation message to sip terminal access device 105 subsequently, this message is carried the address information of terminal called.
During sip terminal 106 receipt of call, GK 101 is the sip terminal user by the address resolution analyzing called number, initiates to connect signaling to sip terminal access device 105 subsequently.In side H.323, sip terminal access device 105 initiates to insert request as called end points to GK 101, and after GK 101 sent access confirmation messages, sip terminal access device 105 forwarded this calling to the SIP side; In the SIP side, 105 pairs of called numbers of sip terminal access device carry out address resolution, and calling is transferred to sip terminal.
After calling out connection foundation,, send a charging triggering message to GK101 by sip terminal access device 105 if need to charge.
Passage I4: be mainly used in and transmit Conference Calling and control information, finish foundation, the release of the media channel between sip terminal access device 105 and the MCU 102, and the exchange of looking audio medium stream.
In order to realize the affiliation of sip terminal 106, need in conference system H.323, increase sip terminal access device 105, this device 105 is logic devices, can be realized by autonomous device, also can be based on existing equipment, as GK, the realization correlation function.
The structure of preferred embodiment sip terminal access device 105 of the present invention mainly comprises referring to shown in Figure 2: sip terminal access device Registering modules 201, call processing module 202, state exchange module 203, protocol conversion module 204, sip address parsing module 205, SIP Registering modules 206, sip agent module 207, the management of sip terminal access device, configuration interface module 208 and H.323 protocol stack module 209, Session Initiation Protocol stack module 210.Wherein, sip terminal access device Registering modules 201, call processing module 202 are connected with protocol stack module 209 H.323, belong to H.323 side in sip terminal access device 105; Sip address parsing module 205, SIP Registering modules 206, sip agent module 207 are connected with Session Initiation Protocol stack module 210, belong to the SIP side in the sip terminal access device 105; State exchange module 203, protocol conversion module 204 is connected with H.323 protocol stack module 209, Session Initiation Protocol stack module 210 simultaneously, and H.323 they belong to promptly that side belongs to the SIP side again.
Each module major function is as follows in the sip terminal access device 105:
Sip terminal access device Registering modules 201: the authentication registration that carries out the sip terminal access device by the rrq message in remote access service (RAS) agreement to GK.
Call processing module 202: handle GK, MCU, the H.323 signaling message between side apparatus and the sip terminal access device H.323 such as terminal, and collection information wherein, finish the calling addressing, H.323 the protocol signaling information receiving and transmitting.
State exchange module 203: safeguard the SIP side of sip terminal access device and the state of side H.323, can trigger different states according to signaling message, conversion between the completion status, thus make correlation module in the sip terminal access device carry out corresponding function under this state.
Mainly comprise from SIP to H.323 state exchange and from H.323 to the state exchange of SIP.Preferable embodiment to state exchange of the present invention describes below:
1, SIP arrives state exchange H.323
When H.323 sip terminal calls out terminal, with call state roughly be divided into the free time, wait for access authentication, wait for ring, H.245 mutual, connect five call states.Wherein, after H.245 generally being used for alternately connecting foundation, mainly be meant the process of exchange of media, do not need among the present invention to consider.Under each state,, action of being taked and the state that is caused are described with all possible message classification.
The requirement of idle condition, ginseng is shown in Table 1:
| The message of receiving | News Category | Behavior | The state redirect |
| ?INVITE | Trigger | Send ARQ | Wait for access authentication |
| ?OPTIONS | Non-triggering | The resettability collection | Idle |
| Non-calling class RAS message | Non-triggering | Return results | Idle |
| Other requests of SIP | Mistake | Return 4xx | Idle |
| Sip response | Mistake | Do not have | Idle |
| All are message Q.931 | Mistake | Do not have | Idle |
| All are message H.245 | Mistake | Do not have | Idle |
| All-calls class RAS message | Mistake | Do not have | Idle |
Table 1
Wait for the requirement of access authentication state, ginseng is shown in Table 2:
| The message of receiving | News Category | Behavior | The state redirect |
| ACF | Trigger | Send Setup | Wait for ring |
| ARJ | Trigger | Send 4xx | Idle |
| SIP?CANCEL | Trigger | Return 2xx | Idle |
| INVITE | Non-triggering | Send 1xx | Wait for access authentication |
| OPTIONS | Non-triggering | The resettability collection | Wait for access authentication |
| Non-calling class RAS message | Non-triggering | Return results | Wait for access authentication |
| Sip response | Mistake | Do not have | Wait for access authentication |
| All are message Q.931 | Mistake | Do not have | Wait for access authentication |
| All are message H.245 | Mistake | Do not have | Wait for access authentication |
| Timer expiry | Trigger | Send 4xx | Idle |
Table 2
Wait for the requirement of ringing condition, ginseng is shown in Table 3:
| The message of receiving | News Category | Behavior | The state redirect | |
| | Trigger | Send | 180 | H.245 mutual |
| Release?Complete | Trigger | Send 4xx | Idle | |
| Call?Proceeding | | Send | 100 | Wait for ring |
| | Trigger | Send | 200 | H.245 mutual |
| SIP?CANCEL | Trigger | Return 2xx, send RLC | Idle | |
| DRQ | Trigger | Send 4xx | Idle | |
| INVITE | Non-triggering | Do not have | Wait for ring | |
| OPTIONS | Non-triggering | The resettability collection | Wait for ring | |
| Non-calling class RAS message | Non-triggering | Return results | Wait for ring | |
| Sip response | Mistake | Do not have | Wait for ring | |
| All are message H.245 | Mistake | Do not have | Wait for ring | |
| Timer expiry | Trigger | Send 4xx | Idle |
Table 3
H.245 the requirement of interaction mode, ginseng is shown in Table 4:
| The message of receiving | News Category | Behavior | The state redirect | |
| H.245 | Trigger | Send | 200 | Connect |
| Release?Complete | Trigger | Send 4xx | Idle | |
| Connect | Non-triggering | Do not have | H.245 mutual | |
| SIP?CANCEL | Trigger | Return 2xx, send RLC | Idle | |
| DRQ | Trigger | Send 4xx | Idle | |
| OPTIONS | Non-triggering | The resettability collection | H.245 mutual | |
| Non-calling class RAS message | Non-triggering | Return results | H.245 mutual | |
| Sip response | Mistake | Do not have | H.245 mutual | |
| Timer expiry | Trigger | Send 4xx | Idle |
Table 4
The requirement of connection status, ginseng is shown in Table 5:
| The message of receiving | News Category | Behavior | The state redirect |
| SIP?BYE | Trigger | Send RLC | Idle |
| Release?Complete | Trigger | Send BYE | Idle |
| DRQ | Trigger | Send BYE | Idle |
| OPTIONS | Non-triggering | The resettability collection | Connect |
| Non-calling class RAS message | Non-triggering | Return results | Connect |
Table 5
2, H.323 arrive the state exchange of SIP
When terminal call sip terminal H.323, with call state be divided into the free time equally, wait for access authentication, wait for ring, H.245 mutual, connect five call states.
The requirement of idle condition, ginseng is shown in Table 6:
| The message of receiving | News Category | Behavior | The state redirect |
| Setup | Trigger | Send ARQ | Wait for access authentication |
| Non-calling class RAS message | Non-triggering | Return results | Idle |
| OPTIONS | Non-triggering | The resettability collection | Idle |
| The SIP request | Mistake | Return 4xx | Idle |
| Sip response | Mistake | Do not have | Idle |
| Every other Q.931 message | Mistake | Do not have | Idle |
| All are message H.245 | Mistake | Do not have | Idle |
| All-calls class RAS message | Mistake | Do not have | Idle |
Table 6
Wait for the requirement of access authentication state, ginseng is shown in Table 7:
| The message of receiving | News Category | Behavior | The state redirect |
| ACF | Trigger | Send INVITE | Wait for ring |
| ARJ | Trigger | Send RLC | Idle |
| Release?Complete | Trigger | Do not have | Idle |
| OPTIONS | Non-triggering | The resettability collection | Wait for access authentication |
| The SIP request | Mistake | Return 4xx | Wait for access authentication |
| Non-calling class RAS message | Non-triggering | Return results | Wait for access authentication |
| Sip response | Mistake | Do not have | Wait for access authentication |
| Every other Q.931 message | Mistake | Do not have | Wait for access authentication |
| All are message H.245 | Mistake | Do not have | Wait for access authentication |
| Timer expiry | Trigger | Send RLC | Idle |
Table 7
Wait for the requirement of ringing condition, ginseng is shown in Table 8:
| The message of receiving | News Category | Behavior | The state redirect |
| 100 | Non-triggering | Send Call Proceeding | Wait for |
| 180 | Trigger | Send Alerting | H.245 mutual |
| 200 | Trigger | Send Connect, ACK | H.245 mutual |
| 4xx，5xx，6xx | Trigger | Send RLC | Idle |
| Release?Complete | Trigger | Send CANCEL | Idle |
| DRQ | Trigger | Send CANCEL | Idle |
| Other are message Q.931 | Mistake | Do not have | Wait for ring |
| OPTIONS | Non-triggering | The resettability collection | Wait for ring |
| Non-calling class RAS message | Non-triggering | Return results | Wait for ring |
| All are message H.245 | Mistake | Do not have | Wait for ring |
| Timer expiry | Trigger | Send 4xx | Idle |
Table 8
H.245 the requirement of interaction mode, ginseng is shown in Table 9:
| The message of receiving | News Category | Behavior | The state redirect |
| 200 | Non-triggering | Send Connect, ACK | H.245 mutual |
| 4xx，5xx，6xx | Trigger | Send RLC | Idle |
| Release?Complete | Trigger | Send CANCEL | Idle |
| DRQ | Trigger | Send 4xx | Idle |
| OPTIONS | Non-triggering | The resettability collection | H.245 mutual |
| Other are message Q.931 | Mistake | Do not have | H.245 mutual |
| Non-calling class RAS message | Non-triggering | Return results | H.245 mutual |
| Timer expiry | Trigger | Send 4xx | Idle |
Table 9
The requirement of connection status, ginseng is shown in Table 10:
| The message of receiving | News Category | Behavior | The state redirect |
| SIP?BYE | Trigger | Send RLC | Idle |
| Release?Complete | Trigger | Send BYE | Idle |
| DRQ | Trigger | Send BYE | Idle |
| OPTIONS | Non-triggering | The resettability collection | Connect |
| Non-calling class RAS message | Non-triggering | Return results | Connect |
Table 10
Wherein, state exchange module 203 is optional in the present invention, also can adopt other modes to trigger each module and carry out corresponding function, such as, a central processing module being set passing through transmitting control commands one by one, unified each module of scheduling is carried out corresponding operating.
Protocol conversion module 204: carry out signaling message in the H.323 conversion between agreement and the Session Initiation Protocol, mainly finish the map addresses, message maps, message parameter mapping, message sequence mapping of the H.323 side of sip terminal access device and SIP side etc.
Sip address parsing module 205: the address translation of the sip terminal that comprised in the signaling message is become the Network Transmission layer address.
SIP Registering modules 206: receive the register requirement of sip terminal, and finish the registration and the authentication of sip terminal.
Wherein, SIP inserts registers entities module 201 and SIP Registering modules 206, and wherein, SIP inserts registers entities module 201 and SIP Registering modules 206, also can be integrated in respectively in call processing module 202 and the sip agent module 207.(the words of Zeng Jiaing herein, the content concord of main and claim 1)
Sip agent module 207: function with sip proxy server, be used for the signaling message transmitting-receiving between sip terminal side and the described sip terminal access device 105, comprise and finish the calling addressing, represent sip terminal to send request etc. to other sip proxy server of calling out on the transfer path.Sip agent module 207 can also can be acted on behalf of for stateless for stateful proxy is arranged.For stateful proxy is arranged, the content in can overwrite request message before the request of transmitting, all state informations that storage ends when conversation end when session is set up.
The management of sip terminal access device, configuration interface module 208: as the interface between sip terminal access device 105 and the conference management support system 104, link to each other with Registering modules 201, call processing module 202, state exchange module 203, protocol conversion module 204, sip address parsing module 205, SIP Registering modules 206 and the sip agent module 207 of sip terminal access device 105 respectively, the operation interface of the management and the configuration of sip terminal access device 105 is provided for the keeper.
H.323 protocol stack module 209, are used to provide H.323 agreement support.
Session Initiation Protocol stack module 210 is used to provide the Session Initiation Protocol support.
By above-mentioned configuration, make the sip terminal access device of present embodiment have a series of complete functions such as protocol conversion, state exchange, sip address parsing, SIP registration, sip agent, call treatment, SIP access registers entities.
In the process of the multipoint conference that sip terminal 106 adding MCU convene, receive the H.323 call signaling of MCU 102 by the call processing module 202 of sip terminal access device 105, trigger different states by state exchange module 203 according to call signaling, and generate corresponding signaling message by the triggering of this state, if this state triggers is message H.323, then send access authentication and address resolution request to GK 101 by call processing module 202, GK 101 finishes loopback confirmation after access authentication and the address resolution, and follow-on-call processing module 202 sends corresponding message to the H.323 side apparatus of correspondence; If what this state triggered is sip message, then the H.323 call signaling of this state correspondence is converted to the SIP call signaling by protocol conversion module 204, and the called H.323 map addresses of carrying in the call signaling become sip address, by sip address parsing module 205 the sip terminal address resolution of carrying in the call signaling is become the Network Transmission layer address again, and send to corresponding sip terminal 106 by sip agent module 207.
If sip terminal access device 105 receives the call signaling from sip terminal 106 sides, then the sip agent module 207 by sip terminal access device 105 receives this call signaling, trigger different states by state exchange module 203 according to call signaling, and generate corresponding signaling message by the triggering of this state, if what this state triggered is sip message, then the sip terminal address resolution of carrying in the call signaling is become the Network Transmission layer address, and send to corresponding sip terminal 106 by sip agent module 207 by sip address parsing module 205; If this state triggers is message H.323, then the SIP call signaling of this state correspondence is converted to H.323 call signaling by protocol conversion module 204, and the called sip address that carries in the call signaling is mapped to H.323 address, send access authentication and address resolution request by call processing module 202 to GK 101 then, GK101 finishes loopback confirmation after access authentication and the address resolution, and follow-on-call processing module 202 sends corresponding message to the H.323 side apparatus of correspondence.
Describe below in conjunction with 3 to 7 pairs of preferred embodiment sip terminal affiliation processes of the present invention of accompanying drawing.
Below the register flow path of sip terminal access device and the authentication registration flow process of sip terminal will be described earlier, multipoint conference, the sip terminal of convening from sip terminal adding MCU respectively selects a typical process to be illustrated withdrawing the membership midway then.
In advance, H.323 the sip terminal access device need arrive side and register, and sip terminal access device register flow path may further comprise the steps referring to shown in Figure 3:
Sip terminal also needs authentication registration, and the sip terminal access device uses Challenge/Response mechanism to carry out the authentication registration of sip terminal in the present embodiment.Its flow process may further comprise the steps referring to shown in Figure 4:
Step 420, in the REGISTER request that the inspection of sip terminal access device receives whether authentication information is arranged, if what receive is the REGISTER request of not carrying authentication information, the sip terminal access device need authenticate sip terminal, with this request of conditional code 401 message responses, the WWW-Authenticate header field is arranged in 401 message responses, and the authentication information in order to prompting should replenish enters step 430; If contain authentication information in the REGISTER that the receives request, then directly enter step 440.
Step 440, the sip terminal access device extracts this authentication information and authenticates, and after authentication was passed through, the sip terminal access device returned 200OK message and gives sip terminal.
Sip terminal adds the multipoint conference flow process that MCU convenes, and referring to shown in Figure 5, may further comprise the steps:
Step 504, sip terminal access device are to MCU loopback Call Proceeding message, and expression is called out and carried out.
Step 505, sip terminal access device send the ARQ request message of expression call request to affiliated GK.
Step 513, sip terminal access device and MCU carry out principal and subordinate's deterministic process.
Step 516 is chargeed if desired, and the sip terminal access device sends the sip terminal charging message to GK.
After step 517, sip terminal were joined successfully, MCU set up conversation with the sip terminal both sides and is connected.
In addition, the multipoint conference that sip terminal adding MCU convenes also can adopt the short calling flow process, referring to shown in Figure 6, may further comprise the steps:
Step 608, sip terminal can send the 100Trying response message to the sip terminal access device represent to call out and carry out, as step 608a; The sip terminal access device resolves to Call Proceeding message loopback MCU with the 100Trying response message, as step 609a; Step 608a and 609a are optionally, can not carry out.The sip terminal ring also sends the 180Ringing response message to the sip terminal access device.
Step 610, sip terminal user off-hook, sip terminal send to the sip terminal access device and carry the 200OK response message of the SDP describing message that consults.
Step 613 is chargeed if desired, and the sip terminal access device sends the sip terminal charging message to GK, the expression call through.
After step 614, sip terminal were joined successfully, MCU set up conversation with the sip terminal both sides and is connected.
More than introduced the sip terminal of being convened by MCU and added conference flow, same sip terminal also can initiatively pass through the sip terminal access device to H.323 side initiation request.
The sip terminal flow process of midway withdrawing the membership referring to shown in Figure 7, may further comprise the steps:
Step 705, sip terminal access device represent to withdraw from the 200OK response message of session to the sip terminal loopback.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.
Claims (32)
1. a sip terminal access device of realizing the affiliation of session initiation protocol sip terminal in conference system H.323 is characterized in that, comprising:
Call processing module, be used for the H.323 transmitting-receiving of the signaling message between the side apparatus and described sip terminal access device, and receiving the sip terminal side when mailing to the Session Initiation Protocol message of side H.323, to the H.323 gatekeeper GK initiation access request of side, and receiving the access confirmation message that described gatekeeper GK returns, this access confirmation message carries the terminal called address information that described gatekeeper GK obtains according to the called number parse addresses;
Protocol conversion module is used to carry out signaling message in the H.323 conversion between agreement and the Session Initiation Protocol;
The sip address parsing module, the address translation that is used for sip terminal that signaling message is comprised becomes the Network Transmission layer address;
The sip agent module is used for the signaling message transmitting-receiving between sip terminal side and the described sip terminal access device, and the signaling message that mails to the sip terminal side is carried out addressing; And
H.323 protocol stack module is used to provide H.323 agreement support;
Session Initiation Protocol stack module is used to provide the Session Initiation Protocol support.
2. device according to claim 1 is characterized in that, this device further comprises:
The state exchange module, be used to safeguard the state of sip terminal access device, behind the signaling message of receiving, according to the corresponding relation of signaling message that sets in advance and state, trigger state exchange, make correlation module in the sip terminal access device carry out corresponding function under this state.
3. device according to claim 2 is characterized in that, described state comprises: idle condition, wait for the access authentication state, wait for ringing condition, H.245 interaction mode and connection status.
4. device according to claim 1 is characterized in that, this device further comprises: the SIP Registering modules that accesses terminal is used for carrying out the authentication registration of sip terminal access device to side H.323.
5. device according to claim 1 is characterized in that, this device further comprises: the SIP Registering modules, be used to receive the register requirement of sip terminal, and sip terminal is registered, authenticated.
6. device according to claim 1, it is characterized in that, this device further comprises: the management of sip terminal access device, configuration interface module, be used for carrying out providing the operation interface of the management and the configuration of sip terminal access device alternately with the conference management support system of conference system H.323.
7. device according to claim 1 is characterized in that, described sip agent module is carried out the stateful proxy function, the content before the request of transmitting in the overwrite request message, all state informations that storage ends when conversation end when session is set up.
H.323 and the map addresses between the SIP, message maps, message parameter mapping, message sequence mapping 8. device according to claim 1 is characterized in that, described protocol conversion module is used to finish signaling message.
9. conference system H.323 includes gatekeeper GK, multipoint control unit MCU, H.323 terminal and conference management support system, it is characterized in that also comprise: the sip terminal access device is connected with sip terminal;
Described sip terminal access device receives the H.323 protocol message that side H.323 mails to the sip terminal side, carries out protocol conversion and address resolution, is converted to Session Initiation Protocol message, sends to corresponding sip terminal according to the address of resolving; And receive the sip terminal side and mail to the H.323 Session Initiation Protocol message of side, the Session Initiation Protocol message conversion is protocol message H.323, and initiate access to described gatekeeper GK and ask, receive the access confirmation message that carries the terminal called address information from described gatekeeper GK, and described H.323 protocol message is sent to corresponding H.323 side apparatus according to described terminal called address;
Described gatekeeper GK receives the access request that described sip terminal access device sends, and according to the called number parse addresses, and sends the access confirmation message that carries the terminal called address information to described sip terminal access device.
10. system according to claim 9 is characterized in that, described sip terminal access device is also judged the message that receives, if do not need protocol conversion, then directly carries out address resolution, according to the destination address of resolving this forwards is gone out.
11. system according to claim 9 is characterized in that, described sip terminal access device also is used to receive the registration of sip terminal, sip terminal is registered, is authenticated, and safeguard the sip terminal state of user.
12. system according to claim 9 is characterized in that, described sip terminal access device also is used for carrying out the authentication registration of sip terminal access device to the gatekeeper GK of side H.323.
13. system according to claim 9 is characterized in that, described sip terminal access device also is used for carrying out providing the operation interface of the management and the configuration of sip terminal access device alternately with the conference management support system of conference system H.323.
14. system according to claim 9, it is characterized in that, described sip terminal access device is also called out and control information with the multipoint control unit MCU interactive conference of side H.323, finishes the exchange of foundation, release and the video media stream of the media channel between sip terminal access device and the MCU.
15. system according to claim 9 is characterized in that, comprises in the described sip terminal access device:
Call processing module is used for the H.323 transmitting-receiving of the signaling message between the side apparatus and described sip terminal access device, and the signaling message of side apparatus carries out addressing to mailing to H.323;
Protocol conversion module is used to carry out signaling message in the H.323 conversion between agreement and the Session Initiation Protocol;
The sip address parsing module, the address translation that is used for sip terminal that signaling message is comprised becomes the Network Transmission layer address;
The sip agent module is used for the signaling message transmitting-receiving between sip terminal side and the described sip terminal access device, and the signaling message that mails to the sip terminal side is carried out addressing; And
H.323 protocol stack module is used to provide H.323 agreement support;
Session Initiation Protocol stack module is used to provide the Session Initiation Protocol support.
16. system according to claim 15, it is characterized in that, also comprise in the described sip terminal access device: the state exchange module, be used to safeguard the state of sip terminal access device, behind the signaling message of receiving, according to the corresponding relation of signaling message that sets in advance and state, trigger state exchange, make correlation module in the sip terminal access device carry out corresponding function under this state.
17. system according to claim 15 is characterized in that, also comprises in the described sip terminal access device: the SIP Registering modules that accesses terminal is used for carrying out the authentication registration of sip terminal access device to side H.323.
18. system according to claim 15 is characterized in that, also comprises in the described sip terminal access device: the SIP Registering modules, be used to receive the register requirement of sip terminal, sip terminal is registered, authenticated.
19. system according to claim 15, it is characterized in that, also comprise in the described sip terminal access device: the management of sip terminal access device, configuration interface module, be used for carrying out providing the operation interface of the management and the configuration of sip terminal access device alternately with the conference management support system of conference system H.323.
20. a method that realizes the affiliation of session initiation protocol sip terminal in conference system H.323 is characterized in that, H.323 in the conference system sip terminal access device is being set, and is being connected with sip terminal;
H.323 the side apparatus signaling message that will mail to sip terminal is sent to described sip terminal access device, the sip terminal access device carries out H.323 arriving the conversion and the address resolution of Session Initiation Protocol to this signaling message, be converted to Session Initiation Protocol message, send to corresponding sip terminal according to the destination address of resolving;
Mail to the H.323 signaling message of side apparatus for sip terminal, the sip terminal access device carries out SIP to the H.323 conversion of agreement to this signaling message, be converted to H.323 protocol message, and to the H.323 gatekeeper GK initiation access request of side, after described gatekeeper GK receives request, according to the called number parse addresses, and sending the access confirmation message that carries the terminal called address information to described sip terminal access device, described sip terminal access device sends to corresponding H.323 side apparatus according to described terminal called address with described signaling message.
21. method according to claim 20 is characterized in that, the process that sip terminal receives H.323 side calling may further comprise the steps:
H.323 after the gatekeeper GK of side is sip terminal by the adress analysis called number, initiate to connect signaling to the sip terminal access device; The sip terminal access device initiates to insert request as called end points to GK, and GK receives that inserting the request back sends access confirmation message to the sip terminal access device; The sip terminal access device is resolved called number, and current calling is transferred to corresponding sip terminal.
22. method according to claim 20 is characterized in that,
Sip terminal may further comprise the steps in the process of the multipoint conference that adding multipoint control unit MCU convenes:
A.H.323 side multipoint control unit MCU obtains called call signaling address, sends to the sip terminal access device and sets up call request message;
B.SIP terminal access device sends call request message to affiliated GK;
The C.GK loopback represents to allow the affirmation message of sip terminal access device call accepted;
D.SIP terminal access device sends to called SIP terminal and invites the request message that adds;
The ring of E.SIP terminal also send to add response message to the sip terminal access device;
F.SIP terminal access device resolves to the H.323 response message loopback of agreement with described response message and gives MCU;
G.SIP terminal use off-hook, sip terminal sends the off-hook response message to the sip terminal access device;
H.SIP terminal access device resolves to the H.323 connection of agreement with the off-hook response message and sets up message;
I.SIP terminal access device sends expression to sip terminal and confirms to connect the message of setting up, and MCU sets up conversation with the sip terminal both sides and is connected.
23. method according to claim 22, it is characterized in that, the multipoint conference process that described sip terminal adding MCU convenes is the short calling flow process, steps A is described to be set up and comprises short calling parameter f aststart in the call request message and equal True, and open logical channel OLC message, OLC message comprises the employed forward direction of described MCU and oppositely media channel and media control channel parameter number and channel information;
Carry the SDP message that to carry out media negotiation in the request message that the described invitation of step D adds;
Carry the SDP message that consults in the message of the described off-hook response of step G;
The described connection of step H is set up and is comprised short calling parameter f aststart in the message and equal True, and opens logical channel OLC message, and OLC message comprises forward direction that SDP parses and oppositely media channel and media control channel parameter number and channel information.
24. method according to claim 22 is characterized in that, the multipoint conference process that described sip terminal adding MCU convenes is the normal call flow process, further comprises between step H and the I:
It is mutual that sip terminal access device and MCU carry out capability set;
Sip terminal access device and MCU carry out principal and subordinate's deterministic process;
Sip terminal access device and MCU open logical channel respectively;
Carry the SDP message that to carry out media negotiation in the message of the described off-hook response of step G;
Carry the SDP message that consults in the message that the affirmation of expression described in step I connection is set up.
25., it is characterized in that described steps A takes a step forward and comprises according to any described method of claim 22 to 24:
MCU sends the request message that carries out access authentication and address resolution to affiliated GK;
GK finishes address resolution and access authentication, and response message is confirmed in loopback.
26. according to any described method of claim 22 to 24, it is characterized in that,
The sip terminal access device further comprises after affiliated GK sends call request message among the step B: the sip terminal access device represents to call out ongoing response message to the MCU loopback.
27., it is characterized in that sip terminal further comprises after receiving the request message that described invitation adds among the step D according to any described method of claim 22 to 24:
Sip terminal sends expression to the sip terminal access device and calls out ongoing response message; The sip terminal access device resolves to expression with this response message and calls out ongoing response message loopback to described MCU.
28. according to any described method of claim 22 to 24, it is characterized in that,
The access device of sip terminal described in the step I sends to sip terminal and further comprises after expression is confirmed to connect the message of setting up: if need to charge, then the sip terminal access device sends the sip terminal charging message to GK.
29. method according to claim 20 is characterized in that, H.323 the sip terminal access device may further comprise the steps in the side registration process:
H.323 the sip terminal access device sends the login request message of agreement and registers to GK;
GK returns to the sip terminal access device by registration reply message with registering result.
30. method according to claim 29, it is characterized in that, by callSignalAddress, rasAddress, terminalAlias field call signaling port, RAS port and the terminal alias to GK registration sip terminal access device, the terminalType field of rrq message is gateway to sip terminal in described login request message.
31. method according to claim 20 is characterized in that, sip terminal authentication registration process may further comprise the steps:
The a1.SIP terminal sends the login request message of Session Initiation Protocol to the sip terminal access device;
A2.SIP terminal access device checks whether authentication information is arranged in this register requirement, if reception is the register requirement of not carrying authentication information, the sip terminal access device sends the response message that prompting should replenish authentication information to sip terminal, enters step a3; If contain authentication information in the register requirement that receives, then directly enter step a4;
The register requirement that the a3.SIP terminal regenerates the Session Initiation Protocol that carries authentication information sends to the sip terminal access device;
A4.SIP terminal access device extracts this authentication information and authenticates, and after authentication was passed through, the sip terminal access device returned response message and gives sip terminal.
32. method according to claim 20 is characterized in that, sip terminal is dropped by the wayside the process of session, may further comprise the steps:
The b1.SIP terminal sends the request message that withdraws from session to the sip terminal access device;
If b2. opened H.245 media control channel, sip terminal access device and multipoint control unit MCU send mutually and close the logical channel order, enter step b3; If do not open H.245 media control channel, then direct execution in step b4;
B3.SIP terminal access device and MCU send end session command mutually;
B4.SIP terminal access device sends Release complete to MCU;
B5.SIP terminal access device withdraws from the response message of session to the sip terminal loopback;
B6.SIP terminal access device sends the request message of expression end of conversation to GK;
B7.GK is to sip terminal access device return response message;
B8.MCU sends the request message of expression end of conversation to GK;
B9.GK is to MCU return response message.
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| CN101707687B (en) * | 2009-11-10 | 2013-01-16 | 中兴通讯股份有限公司 | Video conference service dispatching method and video conference system |
| CN101917586B (en) * | 2010-08-17 | 2013-07-03 | 杭州华三通信技术有限公司 | Joining method and equipment for conference |
| CN102891831A (en) * | 2011-07-20 | 2013-01-23 | 中兴通讯股份有限公司 | Implement method of multimedia conferencing service and related equipment |
| CN105812333A (en) * | 2014-12-31 | 2016-07-27 | 北京大唐高鸿数据网络技术有限公司 | SIP equipment and non-SIP equipment communication method |
| CN106161590A (en) * | 2016-06-15 | 2016-11-23 | 北京数码视讯科技股份有限公司 | Communication means between a kind of different agreement terminal and device |
| CN106453433B (en) * | 2016-12-20 | 2019-09-13 | 北京数码视讯科技股份有限公司 | More signaling protocol interoperability methods and more signal converters |
| CN112261166A (en) | 2017-07-17 | 2021-01-22 | 华为技术有限公司 | Alias management method and device |
| CN110519545B (en) * | 2018-05-22 | 2021-11-23 | 中兴通讯股份有限公司 | Conference authority control method and system, server, terminal and storage medium |
| CN109151369A (en) * | 2018-09-17 | 2019-01-04 | 广州航帆计算机科技有限公司 | A kind of method and system based on networks of different protocol meeting intercommunication |
| CN111435512A (en) * | 2019-01-11 | 2020-07-21 | 北京嘀嘀无限科技发展有限公司 | Service information acquisition method and device |
| CN111726885B (en) * | 2019-03-19 | 2022-07-22 | 海能达通信股份有限公司 | Communication method, core network equipment and communication system |
| CN113645454B (en) * | 2021-06-21 | 2024-02-13 | 天津津航计算技术研究所 | Air-to-ground video communication method and device under satellite link |
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