CN103414868B - A kind of video conference list conference terminal number expansion method based on H323 agreement - Google Patents
A kind of video conference list conference terminal number expansion method based on H323 agreement Download PDFInfo
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Abstract
A kind of video conference list conference terminal number expansion method based on H.323 agreement, when H.323 identifying a terminal in agreement, agreement needs to carry two numerical value: control unit ID, Termination ID, the module numbering of the multipoint control unit that control unit ID uses when being hold a meeting, Termination ID is then multipoint control unit, and to reach the standard grade that order starts to distribute to terminal restriction maximum from 1 according to terminal be 192, multipoint control unit is connected with multiple terminals by terminal access server, described terminal access server be numbered terminal access server ID, when number of terminals N=is < when 192, the normal call logic adopting H.323 agreement communicates；As number of terminals N > 192 time adopt segmentation method of calling, send a message to mapping during end side including multipoint control unit and mapping when end side sends a message to multipoint control unit, thus breaking through the H.323 agreement restriction to single conference terminal number。
Description
Technical field
The present invention relates to a kind of conference capacity-expanding system, relate in particular to a kind of video conference list conference terminal number capacity-enlarging system and method。
Background technology
Video conference is as a kind of modern multimedia communication instrument, and it can make different people participate in same meeting in different places；And by the multipoint control unit (MCU) the management function to meeting, participant can utilize video terminal see the image in spokesman meeting-place and hear the content that spokesman makes a speech, spokesman is it can also be seen that and hear the image and sound of specifying meeting-place。H.323 agreement be ITU-T (International Telecommunication Union) work out one be enclosed within packet the standard of real-time audio, video and data communication be provided on the net, it is built upon general, open computer network communication technology rudimentary knowledge, audio frequency, video and data are allowed to communicate on the packet switching network based on IP bag, covering various autonomous device and personal computer technology, the media product of different vendor and application can interoperability。This standard solves in video conferencing system many problems such as calling and session control, multimedia and Bandwidth Management so that the flexible and changeable video conference modes such as point-to-point, point-to-multipoint, packet become a reality。In recent years to be H.323 widely developed for the multipoint conference unit of standard and to apply, multipoint conference unit is all carried out deep research and development by a lot of manufacturers。Along with departments such as the fast development of network and various video and audio equipment, operator, government department, enterprises, all in the constantly newly-built or existing video conferencing system of dilatation。User is also more and more higher to the requirement of the terminal accessing-point number in single meeting。
Multipoint control unit (MultipleControlUnit, MCU) be responsible for video conference system terminal connect, the work such as the forwarding of audio frequency and video and other convention business logic execution, and based on the video conference of H.323 agreement, the Termination ID specified due to agreement is limited, MCU supports that maximum Termination ID is 192, for solving MCU dilatation problem, currently mainly take following two technical scheme:
The first, the mode of conference cascade is adopted, namely a meeting A is another one meeting B incoming call, so meeting A is it can be seen that the terminal under self meeting and the terminal in meeting B, so in the way of this conference cascade, effectively having evaded the restriction H.323 to Termination ID, the terminal extending most higher level's meeting is counted。Such as a kind of conference cascading method and system disclosed in Chinese patent literature CN101867771A。The system of this conference cascade includes: conference reservation module, this module is for preengaging the MCU resource that multiple meeting is corresponding, when the MCU that multiple meetings are corresponding different, predetermined MCU cascade connection is inquired about the cascade connection that each meeting is corresponding, and sends to conference dispatching module；Conference dispatching module, this module for by described conference reservation module searches to cascade connection corresponding to cascade port add in described each meeting。MCU, described MCU that conference reservation module preengages multiple meetings corresponding hold each described meeting, and meeting assembling and dismantling are divided into one or more meeting by described meeting module。
Above-mentioned concatenation technology is mainly disadvantageous in that: first, and the transformation cost of original system is big。Bypassing cascade signaling, the original system change brought with regard to the variation of terminal method for expressing would is that huge, and particularly under multilevel cases, the terminal iidentification of level belonging to a terminal correspondence, this mark can be carried throughout on whole function logic；Secondly, the level between MCU is associated with the subordinate return path concept to higher level, and this return path is limited in, and namely the code stream of a lot of road subordinates can not be dealt into higher level simultaneously。Which limits the rich of cascade business。
The second, getting around H323 standard signaling, the signaling namely come into contacts with terminal all adopts nonstandard signaling, breaks away from the H323 restriction to Termination ID with this。These two ends of center server and terminal are required for communicating by the mark signaling of new non-consensus standard, and all adopt non-consensus standard due to signaling, and which does not have versatility。
Chinese patent literature CN1258918C discloses a kind of method expanding television system capacity。The method mainly comprises the steps that local multipoint control unit obtains the information of the port numbers being connected with higher level's multipoint control unit, carries out normal capabilities exchange by this port numbers and higher level's multipoint control unit；By the signaling of this port transmitting-receiving MCU after capabilities exchange, the port numbers of local MCU and higher level MCU adopts user setup mode。Technical scheme disclosed in this patent documentation when will to original system dilatation time, the network being with by MCU accesses original system as subnet。The deficiency of this cascade system is in that: the some terminals under a MCU cannot pass to higher level MCU its code stream simultaneously, which limits convention business function, and some higher level operations cannot realize in this concatenation style。
Summary of the invention
For this, the technical problem to be solved is in that under non-conference cascade, single MCU conference terminal number supported is had restriction by the video conference based on H.323 agreement, system reform quantities is big, adopt the cascade system higher level MCU restricted problem of operation to subordinate MCU, thus proposing a kind of that system change is little, and breach H.323 making of restriction to conference terminal number and avoid the higher level MCU operation conditionality to subordinate MCU in prior art simultaneously, a kind of video conference list conference terminal number capacity-enlarging system of dilatation and method when realizing terminal by increasing terminal access server number。
For solving above-mentioned technical problem, the present invention provides a kind of video conference list conference terminal number expansion method based on H.323 agreement, when identifying a terminal in described H.323 agreement, agreement needs to carry two numerical value: control unit ID, Termination ID, multipoint control unit and the module of MCU that wherein control unit ID uses when being hold a meeting are numbered, Termination ID is then multipoint control unit to start to distribute to terminal from 1 according to terminal order of reaching the standard grade, multipoint control unit is connected with multiple terminals by terminal access server, described terminal access server be numbered terminal access server ID,
When number of terminals N=< when 192, adopts the normal call logic of H.323 agreement to communicate；
As number of terminals N > 192 time adopt segmentation method of calling, the number M of required terminal access server >=N/192, M, N are positive integer, specifically include following steps:
(1) mapping when multipoint control unit sends a message to end side
(1.1) when number of terminals is in [1,192] interval, the Termination ID of multipoint control unit distribution is positioned between [1,192], and by any terminal access server, message is transmitted directly to terminal with the form of (control unit ID, Termination ID)；
(1.2) when number of terminals is more than 192, the Termination ID of multipoint control unit distribution is positioned at [193, N] between, when sending message, first the number of terminals the accessed terminal access server less than 192 is selected, then setting up and store the map listing of Termination ID and flowing water ID, described flowing water ID is in [1,192] span order numbering；Then the ID of the terminal access server of its correspondence is assigned to control unit ID, then message is sent to terminal with the form of (terminal access server ID, flowing water ID)；
(2) mapping when end side sends a message to multipoint control unit；
(2.1) when Termination ID is in [1,192] interval, message is transmitted directly to multipoint control unit with the form of (control unit ID, Termination ID) by terminal；
(2.2) when Termination ID > 192 time, (terminal access server ID during terminal messaging, entrained by message, flowing water ID) by the map listing in step (1.2), reverse Mapping is (control unit ID, Termination ID), thus control unit identifies the terminal of correspondence。
When having multiple terminal access server, if producing new mapping relations, then by multipoint control unit, new mappings information is sent to all terminal access servers, synchronizes to become an overall mapping table by the mapping table of the terminal access server of all of conference participation。
In described step (1.2), set up and preserve the map listing of Termination ID and flowing water ID by the terminal adapter of terminal access server。
Described end side sends a message in the mapping process of control unit terminal adapter in terminal access server and carries out。
In described step (1.2) process, corresponding flowing water ID is assigned to the former terminal new terminal ID as former terminal by the terminal adapter of terminal access server；The ID of the terminal access server belonging to terminal is assigned to control unit ID and is mapped as terminal access server ID to identify terminal by control unit ID value by described terminal adapter。
In step (2.2), when described end side messaging is to described multipoint control unit, (terminal access server ID, flowing water ID) entrained by message is carried out reverse Mapping according to setting up and preserve the Termination ID map listing with flowing water ID in step (1.2) by terminal adapter in terminal adapter；In this process the flowing water ID that terminal access server ID and multipoint control unit distribute being converted to control unit ID and former Termination ID, multipoint controller passes through control unit ID and former Termination ID identification terminal。
Multipoint control unit sends conference terminal list to all participant terminals, conference terminal list number is corresponding with meeting number of terminals, when multipoint control unit sends terminal list to terminal, terminal adapter judges that whether terminal list length is more than 192, if more than 192, then front 192 parts are taken out with the standards meetings control message transmission conference terminal list of H.323 agreement to terminal, part more than 192 parts, send non-standard conference control messages by the non-standard function of agreement and carry conference terminal list to terminal, terminal controls message according to standards meetings and these two message of non-standard conference control messages store and show participant end message；If terminal list length is little is equal to 192, then original logic is adopted to be sent to all participant terminals。
The technique scheme of the present invention has the advantage that compared to existing technology
1. a kind of video conference list conference terminal number expansion method based on H.323 agreement of the present invention, different call logic is adopted to communicate when different terminals number, when number of terminals drops on [193, N] time increases corresponding terminal access server and adopts segmentation method of calling, first, multipoint control unit sends a message to the mapping of end side, mainly (control unit ID, Termination ID) it is mapped as (terminal access server ID, flowing water ID) form, then, end side sends a message to mapping during multipoint control unit, mainly (terminal access server ID, flowing water ID) convert (control unit ID to, Termination ID) reverse Mapping；Combine correspondingly mapping relations and breach, by increasing terminal access server, the restriction that H.323 single conference terminal number is to the maximum 192, it is to avoid system is carried out big transformation。Simultaneously, owing to control unit ID there is no practical significance in single meeting, therefore terminal access server ID is assigned to control unit ID, then pass through terminal access server ID and meet the flowing water ID of H.323 agreement and identify the terminal beyond 192, thus avoid in prior art based on the video conference of H.323 agreement, single MCU conference terminal number supported is had restriction, system reform quantities is big, adopt the cascade system higher level MCU problem operating conditionality to subordinate MCU。
2. a kind of video conference list conference terminal number expansion method based on H.323 agreement of the present invention, when having multiple terminal access server, if producing new mapping relations, then by multipoint controller, new mappings information is sent to all terminal access servers, synchronize to become an overall mapping table by the mapping table of the terminal access server of all of conference participation, new mapping relations are notified, and all participant terminal access server facilitate the communication between different terminals。
3. a kind of video conference list conference terminal number expansion method based on H.323 agreement of the present invention, when number of terminals is more than 192, terminal adapter preserves map listing when multipoint control unit sends a message to end side, convenient when being sent a message to multipoint control unit by end side message according to the reverse Mapping of map listing。
4. a kind of video conference list conference terminal number expansion method based on H.323 agreement of the present invention, when there being new terminal to add meeting, multipoint control unit sends conference terminal list to all participant terminals, conference terminal list number is corresponding with meeting number of terminals, when multipoint control unit sends terminal list to terminal, terminal adapter judges terminal list length, if more than 192, then front 192 parts are taken out and be sent to terminal by the standards meetings control message of H.323 agreement, part more than 192 parts, it is sent to terminal by the non-standard function of agreement, terminal stores according to two message and shows participant end message；If terminal list length is little is equal to 192, then adopts original logic to be sent to all participant terminals and ensure that effective transmission of message, breach the H.323 agreement restriction to message list length simultaneously, the transformation degree of system is little。
Accompanying drawing explanation
In order to make present disclosure be more likely to be clearly understood, below according to specific embodiments of the invention and in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is video conferencing system basic boom figure of the present invention；
Fig. 2 is the multipoint control unit of the present invention mapping relations figure when sending a message to end side；
Fig. 3 is the end side of the present invention mapping relations figure when sending messages to multipoint control unit；
Fig. 4 is the schematic diagram that multipoint control unit of the present invention sends terminal list。
Detailed description of the invention
Below in conjunction with drawings and Examples, specific embodiments of the invention are described in further detail。Following example for the purpose of illustrating the invention, but are not intended to limit the scope of the invention。
Technical scheme provides a kind of video conference list conference terminal number expansion method based on H.323 agreement, when H.323 identifying a terminal in agreement, agreement needs to carry two numerical value: control unit ID, Termination ID, multipoint control unit and the module of MCU that wherein control unit ID uses when being hold a meeting are numbered, and control unit ID is changeless in affiliated meeting。Termination ID is then multipoint control unit, and to reach the standard grade that order starts to distribute to terminal restriction maximum from 1 according to terminal be 192, multipoint control unit is by arranging terminal access server and APS server is connected with multiple terminals, described terminal access server for realizing the communication of terminal and MCU, described terminal access server be numbered terminal access server ID。
The present invention is directed to the needs of conference capacity-expanding, carry out segmentation calling when different terminals number。
The first situation, when number of terminals N=< when 192, adopts the normal call logic of H.323 agreement to communicate。When number of terminals N is in [1,192], it is [1,192] that multipoint control unit distributes to the ID of terminal, and with the form of (control unit ID, Termination ID), message is transmitted directly to terminal；When number of terminals N is in [1,192] time, end side sends message with (control unit ID, Termination ID) form be transmitted directly to multipoint control unit, when there being new terminal to add meeting, multipoint control unit adopts the original logic of H.323 agreement to send conference terminal list and standards meetings list message to all participant terminals。
The second situation, as number of terminals N > 192 time, then walk newly-designed calling, adopt segmentation method of calling。The number M of terminal access server needed for meeting >=N/192, M, N are positive integer。As for 250 terminals, at least needed 2 terminal access server (also referred to as APS server)。Now, multipoint control unit and terminal carry out in the numerical value of mark terminal entrained during message communicating, by utilizing Termination ID to map, with realize platform can normally and terminal communication by H.323 standard。The mapping of this programme has mainly been implemented by the terminal adapter (MTADP) in APS server, it and multipoint control unit (MCU), terminal (MT) framework as shown in Figure 1。As number of terminals N > 192 time, meeting has multiple APS server, when there being new mapping to produce, it is necessary to by MCU, new map information notifies all APS servers。
Newly-designed calling passage in the present embodiment is namely as number of terminals N > 192 time, adopt segmentation method of calling, specifically include following steps:
(1) mapping when multipoint control unit sends a message to end side。
(1.1) when number of terminals N is in [1,192], the Termination ID of multipoint control unit distribution is positioned between [1,192], and with the form of (control unit ID, Termination ID), message is transmitted directly to terminal；
(1.2) when number of terminals is more than 192, the Termination ID of multipoint control unit distribution is positioned at [193, N] between, when sending message, first the number of terminals the accessed terminal access server less than 192 is selected, then setting up and store the map listing of Termination ID and flowing water ID, described flowing water ID is in [1,192] span order numbering；Then the ID of the terminal access server of its correspondence is assigned to control unit ID, then message is sent to terminal with the form of (terminal access server ID, flowing water ID)；
(2) mapping when end side sends a message to multipoint control unit；
(2.1) when Termination ID is in [1,192] interval, message is transmitted directly to multipoint control unit with the form of (control unit ID, Termination ID) by terminal；
(2.2) when Termination ID > 192 time, terminal is by when H.323 agreement is to multipoint control unit messaging, (terminal access server ID entrained by message, flowing water ID) in the terminal adapter of terminal access server, reverse Mapping is (control unit ID, Termination ID), thus control unit identifies the terminal of correspondence。
In described step (1.2), the Termination ID set up in the terminal adapter of terminal access server and preserve and the map listing of flowing water ID are as reverse Mapping foundation。
Fig. 2 illustrates that single meeting number of terminals of counting is N (wherein N > 192) send a message to mapping during terminal for the multipoint control unit of example, this mapping process terminal adapter in terminal access server carries out。When Termination ID is in [193, N] time, the Termination ID that multipoint control unit is distributed to also is located at [193, N] between, then terminal N selects the number of terminals terminal access server less than 192 that accesses, and the number upper limit of the terminal having access to due to described terminal access server is 192, accesses saturated terminal access server for reaching number of terminals, terminal can not be accessed again, the terminal access server of the number of terminals not yet saturated (namely less than 192) accessed can only be selected。After terminal N selects and accesses terminal access server, setting up the map listing of Termination ID and flowing water ID, described flowing water ID is in [1,192] span order numbering, described terminal adapter using the numerical value of corresponding flowing water ID as the new terminal ID issuing former terminal；The ID of the terminal access server belonging to terminal is assigned to control unit ID and is mapped as terminal access server ID mark terminal by control unit ID by described terminal adapter, then message is sent to terminal with the form of (terminal access server ID, flowing water ID)。
Fig. 3 illustrates that single conference terminal number is N (wherein N > 192) send a message to mapping during multipoint control unit for the end side of example, this mapping process terminal adapter in terminal access server carries out。(terminal access server ID, flowing water ID) entrained by message is carried out reverse Mapping according to setting up and preserve the Termination ID map listing with flowing water ID in step (1.2) by terminal adapter in terminal adapter；In this process the flowing water ID that the ID of terminal access server and multipoint control unit distribute being converted to control unit ID and former Termination ID, multipoint control unit passes through control unit ID and former Termination ID identification terminal
Fig. 4 illustrate single can number of terminals be N(wherein N > 192) send conference terminal list to the schematic diagram of participant terminal for the multipoint control unit of example, conference terminal list number is corresponding with meeting number of terminals, when multipoint control unit sends terminal list to terminal, terminal adapter judges that whether terminal list length is more than 192, if more than 192, then front 192 parts are taken out with the standards meetings control message transmission conference terminal list of H.323 agreement to terminal, part more than 192 parts, with the non-standard function of agreement (H.323 protocol frame allow user can self-defined off-gauge message be used for carrying a part of information and be transmitted) define non-standard conference control messages and carry conference terminal list to terminal, terminal controls message according to standards meetings and these two message of non-standard conference control messages store and show participant end message。
In the present embodiment, when number of terminals is more than 192, for beyond 192 part, often increase by 192 terminals then to need at least to increase a terminal server by step (1) and (2) realization, that is being realized by the APS server of increase corresponding number, the upper limit of the terminal that each APS server is corresponding is 192。In this way, it is possible to by the mode of extension APS server number in conjunction with corresponding mapping relations, it is achieved that the dilatation to any number of terminals。
When using multiple APS server, after mapping relations are set up, it is also to be noted that and these mapping relations are synchronized to each APS server, reason is in the meeting that video conferencing system is held, chair terminal (MT1) can have operation other-end state and hang up the right of other-end (MT2), at this moment in the message that MT1 terminal sends, the protocol message body terminal iidentification field being with is no longer just the ID of this terminal oneself, if operable terminal MT2 and chairman MT1 is not on same APS server, complete above-mentioned mapping relations, the mapping table of the APS server of all of conference participation is needed to synchronize to become an overall mapping table；When specifically synchronizing, because each APS server is connected with same MCU, then often increase new mapping relations it is necessary to do a broadcast synchronization to each APS server by MCU。
Obviously, above-described embodiment is only for clearly demonstrating example, and is not the restriction to embodiment。For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description。Here without also cannot all of embodiment be given exhaustive。And the apparent change thus extended out or variation are still among the protection domain of the invention。
Claims (7)
1. the video conference list conference terminal number expansion method based on H.323 agreement, when identifying a terminal in described H.323 agreement, agreement needs to carry two numerical value: control unit ID, Termination ID, multipoint control unit and the module of MCU that wherein control unit ID uses when being hold a meeting are numbered, Termination ID is then multipoint control unit to start to distribute to terminal from 1 according to terminal order of reaching the standard grade, multipoint control unit is connected with multiple terminals by terminal access server, described terminal access server be numbered terminal access server ID, it is characterized in that
When number of terminals N≤192, the normal call logic of H.323 agreement is adopted to communicate；
As number of terminals N > 192 time adopt segmentation method of calling, the number M of required terminal access server >=N/192, M, N are positive integer, specifically include following steps:
(1) mapping when multipoint control unit sends a message to end side
(1.1) when number of terminals is in [1,192] interval, the Termination ID of multipoint control unit distribution is positioned between [1,192], and by any terminal access server, message is transmitted directly to terminal with the form of " control unit ID, Termination ID "；
(1.2) when number of terminals is more than 192, the Termination ID of multipoint control unit distribution is positioned at [193, N] between, when sending message, first the number of terminals the accessed terminal access server less than 192 is selected, then setting up and store the map listing of Termination ID and flowing water ID, described flowing water ID is in [1,192] span order numbering；Then the ID of the terminal access server of its correspondence is assigned to control unit ID, then message is sent to terminal with the form of " terminal access server ID, flowing water ID "；
(2) mapping when end side sends a message to multipoint control unit；
(2.1) when Termination ID is in [1.192] interval, message is transmitted directly to multipoint control unit with the form of " control unit ID, Termination ID " by terminal；
(2.2) when Termination ID > 192 time, during terminal messaging, " terminal access server ID; flowing water ID " entrained by message is by the map listing in step (1.2), reverse Mapping is " control unit ID, Termination ID ", thus control unit identifies the terminal of correspondence。
2. video conference list conference terminal number expansion method according to claim 1, it is characterized in that, when having multiple terminal access server, if producing new mapping relations, then by multipoint control unit, new mappings information is sent to all terminal access server, synchronizes to become an overall mapping table by the mapping table of the terminal access server of all of conference participation。
3. a kind of video conference list conference terminal number expansion method according to claim 1 and 2, it is characterised in that in described step (1.2), set up and preserve the map listing of Termination ID and flowing water ID by the terminal adapter of terminal access server。
4. a kind of video conference list conference terminal number expansion method according to claim 3, it is characterised in that described end side sends a message in the mapping process of control unit terminal adapter in terminal access server and carries out。
5. a kind of video conference list conference terminal number expansion method according to claim 4, it is characterized in that, in described step (1.2) process, corresponding flowing water ID is assigned to the former terminal new terminal ID as former terminal by the terminal adapter of terminal access server；The ID of the terminal access server belonging to terminal is assigned to control unit ID and is mapped as terminal access server ID to identify terminal by control unit ID value by described terminal adapter。
6. a kind of video conference list conference terminal number expansion method according to claim 5, it is characterized in that, in step (2.2), when described end side messaging is to described multipoint control unit, " terminal access server ID, flowing water ID " entrained by message is carried out reverse Mapping according to setting up and preserve the Termination ID map listing with flowing water ID in step (1.2) by terminal adapter in terminal adapter；In this process the flowing water ID that terminal access server ID and multipoint control unit distribute being converted to control unit ID and former Termination ID, multipoint control unit passes through control unit ID and former Termination ID identification terminal。
7. a kind of video conference list conference terminal number expansion method according to claim 6, it is characterized in that, multipoint control unit sends conference terminal list to all participant terminals, conference terminal list number is corresponding with meeting number of terminals, when multipoint control unit sends terminal list to terminal, terminal adapter judges that whether terminal list length is more than 192, if more than 192, then front 192 parts are taken out with the standards meetings control message transmission conference terminal list of H.323 agreement to terminal, part more than 192 parts, send non-standard conference control messages by the non-standard function of agreement and carry conference terminal list to terminal, terminal controls message according to standards meetings and these two message of non-standard conference control messages store and show participant end message；If terminal list length is less than or equal to 192, then original logic is adopted to be sent to all participant terminals。
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| CN108270936A (en) * | 2016-12-30 | 2018-07-10 | 展讯通信（上海）有限公司 | Management method, device and the mostly logical terminal of multiple videoconferences |
| CN108881786B (en) * | 2017-05-16 | 2021-11-12 | 中兴通讯股份有限公司 | Video conference server, video conference client and video conference calling method |
| CN111385515B (en) * | 2018-12-27 | 2022-01-11 | 北京紫荆视通科技有限公司 | Video conference data transmission method and video conference data transmission system |
| CN112291501B (en) * | 2019-07-22 | 2023-04-21 | 中兴通讯股份有限公司 | Video conference control method and device |
| CN114827521B (en) * | 2022-05-10 | 2022-11-15 | 广州市保伦电子有限公司 | Conference unit ID automatic numbering method and processing terminal of digital conference system |
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| CN103414868A (en) | 2013-11-27 |
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Effective date of registration: 20160901 Address after: 215011 No. 131 Jinshan East Road, hi tech Zone, Jiangsu, Suzhou Patentee after: Suzhou Keda special Video Co Ltd Address before: 215011 No. 131 Jin Shan Road, New District, Jiangsu, Suzhou Patentee before: Suzhou Keda Technology Co., Ltd. |