CN1622617A - A multi-point control unit and IP network based sharing method and conference system - Google Patents
A multi-point control unit and IP network based sharing method and conference system Download PDFInfo
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- CN1622617A CN1622617A CNA2003101137554A CN200310113755A CN1622617A CN 1622617 A CN1622617 A CN 1622617A CN A2003101137554 A CNA2003101137554 A CN A2003101137554A CN 200310113755 A CN200310113755 A CN 200310113755A CN 1622617 A CN1622617 A CN 1622617A
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Abstract
The multipoint control unit with separated information code flow and control code flow includes multipoint control module and multipoint processing modules controlled with the multipoint control module. The present invention features that the multipoint processing modules are embedded into several terminal devices and connected to the multipoint control module via network, and the terminal devices are to the multipoint control unit via network to realize the transmission of system controlling code flow and the mutual communication. The present invention also provides one multipoint control unit and gateway sharing method based on IP network to avoid resource waste, and one multimedia video meeting system with shared multipoint control unit and gateway and thus lower meeting cost.
Description
Technical field
The present invention relates to the multimedia videoconference system, particularly a kind of multipoint control unit and based on the shared method and the conference system of IP network, this conference system has in IP network shares multipoint control unit (Multi-point Control Unit by different groups of users, MCU) and gatekeeper (Gatekeeper, function GK).
Background technology
The multimedia videoconference system couples together a plurality of multimedia videoconference terminals that are positioned at the strange land by communication network, at multipoint control unit (Multi-point Control Unit, MCU) under the control, allow the participant carry out two-way communication, strengthen the sense of reality, validity and interactivity that people exchange in the strange land with multimedia modes such as image, voice-and-datas.
The multimedia videoconference system is made of multimedia videoconference terminal, multipoint control unit, gatekeeper and transmission network.Multimedia videoconference terminal and other terminal, multipoint control unit and gatekeeper carry out multimedia communications such as two-way image, voice-and-data.The multimedia videoconference terminal has multiple interfaces such as video, audio frequency, data by user's direct control.Can dispose the Input/Output Device of various videos, audio frequency, data etc. according to user's needs.Video conference terminal is sent to other meeting-place by transmission network after video, audio frequency, the data-signal at meeting scene are gathered, encoded; The video that other meeting-place is transmitted, audio frequency, data-signal receive, decode simultaneously, are reduced into primary signal, display the play by output equipments such as video, audio frequency, data.In addition, the multimedia videoconference terminal also receives the control command from MCU, carries out the control corresponding action; Simultaneously meeting control and index signal (as application adding, request floor etc.) are sent to MCU, cooperate MCU to realize system control function.
Multipoint control unit provides the control to a plurality of multimedia videoconference terminals, and carries out the processing and the exchange of image, voice-and-data, supports the multipoint conference of two above terminal rooms.In general, (Multipoint Control MC) handles (Multipoint Processing, MP) two functional modules formations to multipoint control unit with multiple spot by multiple spot control; The multiple spot control module provides the control to multipoint conference; The multiple spot processing module is handled and is exchanged multi-channel video, audio frequency and data-signal; Multipoint processor is controlled by multipoint controller.
The gatekeeper realizes the management function of multimedia videoconference system, comprises user management, conference management, equipment control and Bandwidth Management etc.
Existing dedicated multimedia video conferencing system is usually by community organization's construction such as government, army, enterprises, for this organization internal proprietary.The dedicated multimedia video conferencing system is independently each other, does not link to each other mutually, configuration multipoint control unit and gatekeeper separately in the system, as shown in Figure 1.
At present, it is bigger to build the required input of multimedia videoconference system, and wherein multipoint control unit and gatekeeper's investment accounts for the larger proportion of gross investment usually.This input except that minority government department and large enterprise can bear, other medium and small organization and unable the bearing of individual, this just causes the multimedia videoconference system large-scale promotion to use.
For this reason, the inventor has carried out intensive parsing and research to video conferencing system of the prior art, the subject matter of its existence is multipoint control unit (Multi-pointControl Unit, MCU), because multiple spot control concentrates in together with the multiple spot processing capacity, the multipoint control unit that promptly is positioned on the same position physical equipment should realize that the multiple spot controlled function realizes the multiple spot processing capacity again, causes occurring following technological deficiency:
1. owing on multipoint control unit, realize the multiple spot processing capacity in a concentrated manner, the processing of multipoint control unit load is heavier, particularly more at system user, when carrying out a plurality of meeting simultaneously, just limit the scale of system, can't set up the large multimedia conference system; Cause utilance low and build on a small scale, a large amount of potential users can't enjoy.
2. when carrying out multipoint conference, the image that all participant terminals send, voice and data are all concentrated to multipoint control unit, certainly will cause multipoint control unit place node data flow bigger like this, take more bandwidth resources, particularly at the participant terminal quantity more for a long time, may cause network congestion when serious.
Summary of the invention
The present invention is directed to the above-mentioned defective that exists in the prior art, a kind of multipoint control unit that can make that information code current separates with control stream is provided.
The present invention also provides a kind of service efficiency that can improve multimedia videoconference system multipoint control unit and gatekeeper, thus avoid the idle of resource and waste based on the multipoint control unit of IP network and gatekeeper's shared method.
The present invention also provides a kind of shared multipoint control unit and gatekeeper's multimedia videoconference system, can realize the shared multipoint control unit of multimedia videoconference terminal and gatekeeper's equipment of different user group, thereby reduce the whole use cost of using the multimedia videoconference system effectively.
Technical scheme of the present invention is as follows:
A kind of multipoint control unit comprises the multiple spot processing module of multiple spot control module and its control, and it is characterized in that: described multiple spot processing module is implanted in respectively in a plurality of terminal equipments of described multiple spot indication.
Described multiple spot processing module and the described multiple spot control module that is implanted in the terminal equipment passed through network-in-dialing, and described terminal equipment and described multipoint control unit are by network-in-dialing, with the transmission of realization system control stream and mutual communication.
Described a plurality of terminal equipment is the multimedia videoconference terminal.
A kind of based on the multipoint control unit of IP network and gatekeeper's shared method, it is characterized in that comprising the steps: that a. is deployed in the described a kind of multipoint control unit of one of gatekeeper and claim 1-3 on the IP network; B. the multimedia conferencing terminal all is deployed on the have quality assurance IP network of (QoS Quality of Service); C. at the interface on-premise network address-translating device of public ip network and private IP network network.
Described gatekeeper's quantity is one or more, and the quantity of described multipoint control unit is one or more.
A kind of shared multipoint control unit and gatekeeper's multimedia videoconference system, comprise that being deployed in of different user group has the multimedia videoconference terminal on the IP network of quality assurance, be deployed in multipoint control unit and gatekeeper on the IP network, it is characterized in that: described multipoint control unit is the described a kind of multipoint control unit of one of claim 1-3, this multipoint control unit and described gatekeeper all are deployed on the IP network, and the interface of private IP network network and public ip network all is deployed with network address translation apparatus.
The private IP network network of described different user group adopts the access way of dialing or ADSL or DDN or SDH or ATM or VPN when having disposed the public ip network of described multipoint control unit with gatekeeper's equipment and link to each other, and shares multipoint control unit and gatekeeper's equipment with the multimedia videoconference terminal that realizes different user group.
Described gatekeeper has the service handling module, and described service handling module comprises accepting lands application, authentication and mandate, user management, resource management, meeting and site management, equipment control and Bandwidth Management and charge accounting statistics.
Technique effect of the present invention is as follows:
A kind of multipoint control unit of the present invention owing to adopted the technical conceive that the multiple spot processing module of multiple spot control module and its control is separated setting, is about to the multiple spot processing module and is implanted in respectively in a plurality of terminal equipments of described multiple spot indication.Like this, just the multiple spot processing capacity can be separated with the multiple spot controlled function, realize the multiple spot controlled function by MCU, the multiple spot processing capacity of MCU can realize on the multimedia conferencing terminal.Because the multiple spot processing capacity is separated from multipoint control unit, is distributed to conference terminal, information code currents such as the image in the multimedia videoconference system, voice-and-data separate with control stream.Multipoint control unit and each multimedia conferencing system terminal have only the exchange of control stream, do not have the exchange of information code currents such as audio frequency and video, and information code current through corresponding route, transmits between each multimedia terminal under the control of multipoint control unit.
Because the multiple spot processing module and the multiple spot control module that are implanted in the terminal equipment are passed through network-in-dialing, terminal equipment and multipoint control unit pass through network-in-dialing, this is a kind of technological means easily, can realize the transmission of system's control stream and mutual communication easily fully.
Because a plurality of terminal equipments are the multimedia videoconference terminal, so just help multipoint control unit and realize sharing, can satisfy the needs of setting up the large multimedia conference system.
The present invention is a kind of based on the multipoint control unit of IP network and gatekeeper's shared method, owing to adopted following steps, the described a kind of multipoint control unit of one of gatekeeper and claim 1-3 is deployed on the IP network; The multimedia conferencing terminal all is deployed on the have quality assurance IP network of (QoSQuality of Service); Interface on-premise network address-translating device at public ip network and private IP network network, like this, multipoint control unit among the present invention and gatekeeper are shared by all groups of users in the multimedia videoconference system, multipoint control unit and gatekeeper are deployed on the IP network, realize intercommunication mutually between private IP network network and the public ip network by network address translation (NAT, Network AddressTranslation) equipment.
Multimedia videoconference terminal among the present invention can be deployed on the private ip network, also can be deployed on the publicly-owned IP network.In order to ensure the transmission quality of Voice ﹠ Video, the Voice ﹠ Video code stream communication of video conference terminal must have transmission quality to guarantee the assurance of (QoS, Qualityof Service) and bandwidth.Multipoint control unit in the multimedia videoconference system among the present invention and gatekeeper can be deployed on the private ip network, also can be deployed on the publicly-owned IP network, because communicating by letter between multipoint control unit and gatekeeper and the video conference terminal do not need transmission of audio and video code flow, therefore the requirement to QoS and bandwidth greatly reduces.
A kind of shared multipoint control unit of the present invention and gatekeeper's multimedia videoconference system, the scope of application and the scale of multimedia videoconference system have fully been enlarged, improve multimedia videoconference system multipoint control unit and gatekeeper's service efficiency, can avoid the idle and waste of resource.During the construction of multimedia videoconference system drops into, the investment of multipoint control unit and gatekeeper's equipment accounts for the larger proportion of gross investment usually, core point of the present invention is to share multipoint control unit and gatekeeper by different groups of users, reduces the whole use cost of using the multimedia videoconference system effectively.
With different being of standard video conferencing system of the prior art H.323, video conferencing system of the prior art requires the guarantee of the quality assurance of transmission must be arranged (QoS, Quality of Service) and the required bandwidth of Voice ﹠ Video code stream of communicating by letter between multipoint control unit and the video conference terminal.
Description of drawings
The distributed architecture schematic diagram of the existing multimedia videoconference of Fig. 1 system;
Fig. 2 is for adopting the distributed architecture schematic diagram of multimedia videoconference system in the embodiment of the invention 1;
Fig. 3 is for adopting the distributed architecture schematic diagram of multimedia videoconference system in the embodiment of the invention 2.
Embodiment
Below in conjunction with embodiment and accompanying drawing technical spirit of the present invention is described in further detail.
Embodiment 1:
As shown in Figure 2, the multimedia videoconference system among the present invention is made of multimedia videoconference terminal, multipoint control unit and gatekeeper's equipment, and these equipment are interconnected by IP network.IP network is divided into privately owned IP network (private IP address) and public IP network (public ip address) usually.Privately owned IP network is meant that its IP address is distributed in the IP network of following scope:
Category-A: 10.0.0.0-10.255.255.255.
Category-B: 172.16.0.0-172.31.255.255.
C class: 192.168.0.0-192.168.255.255.
The IP network that the IP address is distributed in outside the above scope is called public IP network.
Multipoint control unit and gatekeeper's deployed with devices are in public IP network, and multipoint control unit and gatekeeper's equipment can be one or more according to how much disposing of number of users.The user of different groups shares multipoint control unit and gatekeeper's equipment in the whole network.
In the present invention,, therefore, between multipoint control unit and video conference terminal, do not have audio-video code stream, have only system's control and exchanges data code stream because the multiple spot processing capacity of multipoint control unit is separated with the multiple spot controlled function.In addition, compare with audio-video code stream, the bandwidth that system's control and exchanges data code stream take is lower.
The multimedia videoconference terminal of different user group be deployed in respectively separately have QOS to ensure and the private IP network network of bandwidth safeguard in.The private IP network network of each groups of users can adopt plurality of access modes (as dialing, ADSL, DDN, SDH, ATM, VPN etc.) when linking to each other with the public ip network of having disposed multipoint control unit and gatekeeper's equipment, the multimedia videoconference terminal of different user group is shared multipoint control unit and gatekeeper's equipment.
At the private IP network network of each groups of users and the interface of public ip network, on-premise network address transition (NAT, Network Address Translation) equipment.NAT device can allow and use the IP network of privately owned address to be connected with the public IP network.Use the dedicated network of privately owned address to use NAT to serve when sending packet, address mapping relation and its function subset by the inner foundation of NAT: port address conversion (Port Address Translation, PAT) the privately owned address of dedicated network is converted to the IP address of public network, so these packets can be sent on the public IP network; Similarly, NAT service becomes corresponding private IP network address with the IP address transition of public network, thereby has realized the intercommunication mutually between private ip network and the public IP network.
In the present embodiment, consider above-mentioned feature, and in conjunction with figure two we as can be seen, the multipoint control unit and the gatekeeper of public IP network and between the video conference terminal of private ip network, do not have audio-video code stream, have only system's control and exchanges data code stream, that is to say that audio-video code stream only is confined in the private IP network network, system's control and exchanges data code stream transmit between private IP network network and public ip network.
For the quality of the audio-video signal that guarantees the multimedia videoconference system, therefore require the IP network at video conference terminal place to have quality assurance (QoS) and bandwidth safeguard.In general, the private IP network network is easier to realize QoS, and public ip network is relative difficult then, realizes fully on whole public ip network that in other words QoS is difficult.
Therefore, present embodiment is suitable for that public ip network does not possess quality assurance and the private IP network network is linked into the lower occasion of public ip network bandwidth.
System work process is as follows:
Behind the multimedia videoconference starting terminal, at first set up two-way communication and be connected with the gatekeeper, application login to the gatekeeper, the gatekeeper if this terminal by subscription authentication, is then logined successfully, can use native system to the authenticating identity of this terminal; Otherwise this terminal can not be used native system.The fail safe that the subscription authentication function of system can the assurance system be used prevents the unauthorized user using system.
The gatekeeper obtains this user for information about in the subscription authentication process, as public network address of the NAT device of the IP address of user identity sign indicating number, user name, user's private network, user's private network etc., the gatekeeper according to user identity sign indicating number inquiry local data base, confirms whether the user is authorized user again.If authorized user, then upgrade this user's relevant information, as with this user-dependent IP address, User Status etc.
After the multimedia videoconference terminal is logined successfully, can use native system, the process of holding a meeting is as follows:
The multimedia videoconference terminal that need hold a meeting sends the conferencing information that will hold at first to the gatekeeper as the promoter of meeting.The user comprises information such as meeting title, meeting start time, meeting duration, meeting overview and participant member by the video conference terminal conferencing information.Video conference terminal is sent to the gatekeeper with meeting information, the gatekeeper is according to the strategies such as load condition of multipoint control unit MCU in the distribution of participant member in system, the system, for this meeting distributes a multipoint control unit MCU, MCU controls this meeting by this multipoint control unit.The gatekeeper adds this meeting relevant information in the local conferencing information database to.By said process, the gatekeeper can upgrade the conferencing information with maintenance system real-time dynamicly.
When the terminal of initiation meeting is held a meeting, at first set up two-way communication and be connected with the multipoint control unit MCU of this meeting; Call out each participant joining meeting to terminal by multipoint control unit MCU.Multipoint control unit MCU all set up two-way communication with the participant terminal that adds meeting and was connected this moment.After adding meeting, the participant terminal still keeps communicating to connect with the gatekeeper, so that the variation of reporting terminal state to the gatekeeper in real time.For example, after the adding meeting, the state of each participant terminal becomes " participant " by " free time ", at this moment, the initiatively report condition variation to the gatekeeper of each participant terminal, the gatekeeper upgrades user state information.
During the progress of the meeting, the multipoint control unit MCU of this meeting can be according to the demanding terminal that has the meeting control, the control multipoint conference, for example, selected certain can field picture harmony sound to other meeting-place broadcasting, right to speak distributed to the meeting-place that needs speech etc.For realizing the multiple spot controlled function, must keep two-way communication to connect between multipoint control unit MCU and the participant terminal, and exchange control and response message.
When meeting adjourned, control this meeting multipoint control unit MCU and each participant terminal and all disconnect and communicating to connect, each participant terminal returns to idle condition, and only the gatekeeper keeps communicating to connect.
Embodiment 2:
As shown in Figure 3, multipoint control unit and gatekeeper's deployed with devices are in public IP network, and multipoint control unit and gatekeeper's equipment can be one or more according to how much disposing of number of users; The user of different groups shares multipoint control unit and gatekeeper's equipment in the whole network.
The multimedia videoconference terminal that is deployed in the private IP network network links to each other with gatekeeper's equipment with multipoint control unit on the public ip network by plurality of access modes (as dialing, ADSL, DDN, SDH, ATM, VPN etc.).Part multimedia videoconference terminal part is deployed in the public ip network with QoS, and the public ip network with QoS belongs to the part of public ip network.Because communicating by letter between multipoint control unit and gatekeeper and the video conference terminal do not need transmission of audio and video code flow, therefore, the requirement of communicating by letter to QOS and bandwidth between the video conference terminal with public ip address and the multipoint control unit with public ip address and the gatekeeper's equipment greatly reduces.Thereby make the multimedia videoconference terminal of different user group share multipoint control unit and gatekeeper's equipment.
At the interface of private IP network network and public ip network, on-premise network address transition (NAT, Network Address Translation) equipment.NAT device can allow and use the IP network of privately owned address to be connected with the public IP network.Use the dedicated network of privately owned address to use NAT to serve when sending packet, address mapping relation and its function subset by the inner foundation of NAT: port address conversion (Port Address Translation, PAT) the privately owned address of dedicated network is converted to the IP address of public network, so these packets can be sent on the public IP network; Similarly, NAT service becomes corresponding private IP network address with the IP address transition of public network, thereby has realized the intercommunication mutually between private ip network and the public IP network.
In the present invention,, therefore, between multipoint control unit and video conference terminal, do not have audio-video code stream, have only system's control and exchanges data code stream because the multiple spot processing capacity of multipoint control unit is separated with the multiple spot controlled function.In addition, compare with audio-video code stream, the bandwidth that system's control and exchanges data code stream take is lower.
In the present embodiment, consider above-mentioned feature, and in conjunction with figure three we as can be seen, between the multipoint control unit of public IP network and gatekeeper and video conference terminal, there is not audio-video code stream, have only system's control and exchanges data code stream, that is to say that the private IP network network that audio-video code stream only is confined to have QoS and bandwidth safeguard has reached in the public ip network with QoS and bandwidth safeguard.
Quality for the audio-video signal that guarantees the multimedia videoconference system requires IP network to have QoS and bandwidth safeguard usually.In general, the private IP network network is easier to realize QoS and bandwidth safeguard, and public ip network is relative difficult then, realizes fully on whole public ip network that in other words QoS and bandwidth safeguard are difficult.
Therefore, present embodiment is suitable for a part of user and possesses the private IP network network with QoS and bandwidth safeguard, and other has certain customers to have occasion in the public ip network of QoS and bandwidth safeguard.
Under present embodiment, system work process is identical with embodiment 1.
Should be pointed out that the above execution mode can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
Claims (8)
1. multipoint control unit comprises the multiple spot processing module of multiple spot control module and its control, and it is characterized in that: described multiple spot processing module is implanted in respectively in a plurality of terminal equipments of described multiple spot indication.
2. a kind of multipoint control unit according to claim 1, it is characterized in that: described multiple spot processing module and the described multiple spot control module that is implanted in the terminal equipment passed through network-in-dialing, described terminal equipment and described multipoint control unit are by network-in-dialing, with the transmission of realization system control stream and mutual communication.
3. a kind of multipoint control unit according to claim 2 is characterized in that: described a plurality of terminal equipments are the multimedia videoconference terminal.
4. one kind based on the multipoint control unit of IP network and gatekeeper's shared method, it is characterized in that comprising the steps: that a. is deployed in the described a kind of multipoint control unit of one of gatekeeper and claim 1-3 on the IP network; B. the multimedia conferencing terminal all is deployed on the have quality assurance IP network of (QoS Quality of Service); C. at the interface on-premise network address-translating device of public ip network and private IP network network.
5. according to claim 4 a kind of based on IP network multipoint control unit and gatekeeper's shared method its, be characterised in that: described gatekeeper's quantity is one or more, and the quantity of described multipoint control unit is one or more.
6. shared multipoint control unit and gatekeeper's multimedia videoconference system, comprise that being deployed in of different user group has the multimedia videoconference terminal on the IP network of quality assurance, be deployed in multipoint control unit and gatekeeper on the IP network, it is characterized in that: described multipoint control unit is the described a kind of multipoint control unit of one of claim 1-3, this multipoint control unit and described gatekeeper all are deployed on the IP network, and the interface of private IP network network and public ip network all is deployed with network address translation apparatus.
7. a kind of shared multipoint control unit according to claim 6 and gatekeeper's multimedia videoconference system, it is characterized in that: the private IP network network of described different user group adopts the access way of dialing or ADSL or DDN or SDH or ATM or VPN when having disposed the public ip network of described multipoint control unit with gatekeeper's equipment and link to each other, and shares multipoint control unit and gatekeeper's equipment with the multimedia videoconference terminal that realizes different user group.
8. a kind of shared multipoint control unit according to claim 7 and gatekeeper's multimedia videoconference system, it is characterized in that: described gatekeeper has the service handling module, and described service handling module comprises accepting lands application, authentication and mandate, user management, resource management, meeting and site management, equipment control and Bandwidth Management and charge accounting statistics.
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| CNB2003101137554A CN100542099C (en) | 2003-11-24 | 2003-11-24 | A kind of multipoint control unit and based on the shared method and the conference system of IP network |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454821C (en) * | 2006-09-07 | 2009-01-21 | 华为技术有限公司 | Method for resource sharing among MCUs in videoconference system |
| CN101710960A (en) * | 2009-08-06 | 2010-05-19 | 中兴通讯股份有限公司 | Method and system for realizing video conference |
| CN103327288A (en) * | 2013-06-08 | 2013-09-25 | 青岛优视通网络有限公司 | Video communication system capable of passing through firewall |
| CN104836983A (en) * | 2015-05-26 | 2015-08-12 | 苏州科达科技股份有限公司 | Video conference resource management system and resource server |
| CN107690083A (en) * | 2017-08-10 | 2018-02-13 | 深圳创维－Rgb电子有限公司 | A kind of safety protection method based on intelligent TV set, storage medium and intelligent television |
| CN109413291A (en) * | 2018-08-28 | 2019-03-01 | 陈立新 | Method for carrying out telephone conference by using distributed architecture |
| CN113347431A (en) * | 2021-04-15 | 2021-09-03 | 昆明学院 | Image communication device and method for communication terminal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6603501B1 (en) * | 2000-07-12 | 2003-08-05 | Onscreen24 Corporation | Videoconferencing using distributed processing |
| CN1190079C (en) * | 2002-03-29 | 2005-02-16 | 武汉邮电科学研究院 | Soft exchange based video conference system multipoint controller |
| CN1147806C (en) * | 2002-08-20 | 2004-04-28 | 西安交通大学 | Multimedia real-time lessons-giving system based on IP web |
| CN1272932C (en) * | 2003-04-28 | 2006-08-30 | 王生安 | Distributed multimedia conference system based on IP network |
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2003
- 2003-11-24 CN CNB2003101137554A patent/CN100542099C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454821C (en) * | 2006-09-07 | 2009-01-21 | 华为技术有限公司 | Method for resource sharing among MCUs in videoconference system |
| CN101710960A (en) * | 2009-08-06 | 2010-05-19 | 中兴通讯股份有限公司 | Method and system for realizing video conference |
| CN103327288A (en) * | 2013-06-08 | 2013-09-25 | 青岛优视通网络有限公司 | Video communication system capable of passing through firewall |
| CN104836983A (en) * | 2015-05-26 | 2015-08-12 | 苏州科达科技股份有限公司 | Video conference resource management system and resource server |
| CN104836983B (en) * | 2015-05-26 | 2018-11-20 | 苏州科达科技股份有限公司 | video conference resource management system and resource server |
| CN107690083A (en) * | 2017-08-10 | 2018-02-13 | 深圳创维－Rgb电子有限公司 | A kind of safety protection method based on intelligent TV set, storage medium and intelligent television |
| CN109413291A (en) * | 2018-08-28 | 2019-03-01 | 陈立新 | Method for carrying out telephone conference by using distributed architecture |
| CN113347431A (en) * | 2021-04-15 | 2021-09-03 | 昆明学院 | Image communication device and method for communication terminal |
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| CN100542099C (en) | 2009-09-16 |
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