CN100334882C - Method of transmission line configuration - Google Patents
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- CN100334882C CN100334882C CNB2003101230394A CN200310123039A CN100334882C CN 100334882 C CN100334882 C CN 100334882C CN B2003101230394 A CNB2003101230394 A CN B2003101230394A CN 200310123039 A CN200310123039 A CN 200310123039A CN 100334882 C CN100334882 C CN 100334882C
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Abstract
The present invention discloses a collocating method for transmission lines, which is used for a multimedia conference television system. Line collocating information corresponding to each node is formed by collocating a plurality of transmission lines for each node in the multimedia conference television system by the method. In the whole process of holding a conference, if the current transmission line of the node goes wrong, another transmission line is selected among a plurality of transmission lines collocated for the node according to the line collocating information corresponding to the node so as to proceed with the conference. Thus, the purpose that a new transmission line can be flexibly switched without the need of temporarily interrupting the conference first when the transmission line used by the node in the multimedia conference television system goes wrong can be achieved.
Description
Technical field
The present invention relates to field of multimedia communication, specially refer to a kind of transmission line configuration method in the multimedia videoconferencing system.
Background technology
Along with the fast development of data communication technology, the rapid rising that broadband services needs, make multimedia communication application more and more widely.Multimedia videoconferencing system is exactly on a kind of basis that is based upon data communication, utilize existing IP network, integrated services digital network (ISDN, Integrated Services DigitalNetwork) or public switched telephone network (PSTN) (PSTN, Public Switched Telephone Network) data communication network such as, but carry out both real-time Transmission image informations, again the communication system of real-time Transmission voice messaging simultaneously.Use this system, can utilize the local terminal, for the people in the different location provides visual multimedia conferencing; Simultaneously, the synchronism of the interactivity of this collection computer, the distributivity of network and multimedia messages is the restriction of traditional communication modes such as the multimedia videoconferencing system of one has been broken through computer, communicated by letter, TV, for people provide brand-new interactive service.
At present, multimedia videoconferencing system can support the multiple spot access to carry out multimedia communication simultaneously, and referring to Fig. 1, this figure is the structural topology figure of prior art multimedia videoconferencing system.Multimedia videoconferencing system shown in Figure 1 comprises: can provide unidirectional or bidirectional real-time and can support voice communication and a plurality of terminals (Terminal) 10 of video communication, carry out the multipoint control unit (MCU of audio frequency, video communication between the control terminal 10, Multipoint Control Unit) 20 and control hold the Service Management Center (SMC, Service Manage Center) 30 of overall process with the whole meeting of management.Wherein carry out multimedia communication by all kinds of wide/narrow band data communication networks 40 between terminal 10 and the MCU20, be between terminal 10 and the MCU20 by all kinds of wide/data transmission link of narrow band data communication network 40 carries out audio code stream, video code flow and some the meeting control command information of transmitting multimedia meeting, wherein all kinds of wide/narrow band data communication network 40 comprises data communication networks such as IP network, ISDN net and PSTN net, can also be E1, T1 data private network.
As shown in Figure 1, if IP network and the MCU20 in the multimedia videoconferencing system in wide/narrow band data communication network 40 that terminal A chooses carry out multimedia communication, then terminal A can link to each other with the IP transmission line by the IP interface of self, carries out the transmission of video code flow and audio code stream by IP transmission line and MCU20; And if ISDN net and the MCU20 in the multimedia videoconferencing system in terminal B chooses wide/narrow band data communication network 40 carry out multimedia communication, then terminal B can link to each other with the ISDN transmission line by the isdn interface of self, carries out the transmission of video code flow and audio code stream by ISDN transmission line and MCU20.At present, most multimedia conferencing terminals 10 all can provide various types of interfaces simultaneously, as comprise: E1 interface, isdn interface and IP interface etc.
In the prior art, each multimedia conferencing terminal 10 and MCU20 in the multimedia videoconferencing system carry out before multimedia conferencing communicates by letter, at first to carry out the predefine of transmission line, be terminal 10 before adding conference system, the transmission line type that the transmission line type configuration that oneself is used is selected in advance as the user; When meeting was held, this terminal 10 can be linked in the multimedia videoconferencing system with the transmission line type of selecting in advance.Like this, when meeting began, terminal 10 can be linked among the MCU20 with predefined transmission line, carries out multimedia conferencing communication.
For example: terminal 10 is before carrying out multimedia conferencing communication, and predefine is linked in the multimedia videoconferencing system with the E1 transmission line, and then in the process of holding a meeting, this terminal 10 is all carried out multimedia conferencing with the E1 transmission line with MCU20 and communicated by letter.
If in the whole process that meeting is held, above-mentioned predefined E1 transmission line breaks down, or the user wants to change the transmission line type, then must be at first interrupts the meeting that hold at present by Service Management Center SMC30, perhaps temporarily isolate out this terminal 10 earlier;
SMC30 is updated to other transmission line type with the E1 transmission line of this terminal 10 configurations then, as ISDN transmission line, IP transmission line etc.;
In the SMC30 side, after the operation of renewal configure transmission lines was finished, SMC30 controlled MCU20 again and holds this meeting again, perhaps controlled MCU20 and called out this terminal 10 access meetings again.
Yet at present, because multimedia videoconferencing system can make in the terminal 10 of different regions and carry out real-time audio frequency, Video show, and the saving cost exchanges so increasing international exchanging meeting negotiation Intergovernmental Conference all extensively adopts multimedia videoconferencing system to carry out meeting.So if above-mentioned meeting is interrupted, perhaps terminal 10 segregate situations all can be brought bigger loss to people, the particularly very urgent and very important meeting of conference content for some, its extent of damage can be bigger.
Simultaneously, since various wide/transmission line in the narrow band data communication network 40 all is arranged in the outside natural environment, so various transmission lines usually since the influence of outside various natural environments (as the corrosion of rainwater, being exposed to the sun etc. of sunlight) and some artificial deliberately existence of destructive factors, often be subjected to infringement in various degree, so that unpredictable line broken circuit fault occurs.If transmission line is under unpredictable situation, open circuit fault appears, the terminal 10 that will cause using this transmission line to be linked in the multimedia videoconferencing system is interrupted with the conference system of holding, it is synchronous to consider that whole meeting is held, usually need to interrupt the process that whole meeting is held this time, transmission line with this terminal 10 switches on the transmission line of another one data communication network then, and then holds this meeting again.
Above-mentioned is to solve terminal 10 chance failure to occur because of transmission line, and causing the processing method that disconnects with conference system, the meeting that needs temporary transient interruption holding just can switch to new transmission line, will prolong the time that meeting is held like this, and the mode of switching transmission line is also more loaded down with trivial details.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of transmission line configuration method, so that multimedia videoconferencing system occurs at transmission line need not temporarily interrupting meeting under the situation of chance failure, just can switch to new transmission line flexibly.
For addressing the above problem, the present invention proposes a kind of transmission line configuration method, be used for multimedia videoconferencing system, described method comprises the following steps:
(1) is each node configuration plurality of transmission lines in the described multimedia videoconferencing system, to form the line configuring information of corresponding each node;
(2) in the whole process that meeting is held, if the current transmission line of described node breaks down, then according to line configuring information that should node, from proceeding meeting for selecting an other transmission lines the plurality of transmission lines that this node disposed.
Wherein in described step (1), press the different priorities order and be each node configuration plurality of transmission lines; In described step (2), from plurality of transmission lines, select the highest transmission lines of current priority order and proceed meeting for the different priorities order that this node disposed.
Beneficial effect of the present invention: because transmission line configuration method of the present invention is by being the pre-configured plurality of transmission lines circuit of each node in the multimedia videoconferencing system, in the whole process that meeting is held, when the transmission line of the current use of described node breaks down, can be by Service Management Center, multipoint control unit or described node itself from the storage to selecting an other transmission lines the plurality of transmission lines of node, so that based on this transmission line that selects, multipoint control unit can continue to call out this node or this node can continue to be linked into conference system, thereby has realized proceeding of meeting.Therefore, in the whole process that meeting is held, when the transmission line of node use breaks down, can reach and temporarily to interrupt meeting earlier, just can switch to the purpose of new transmission line flexibly.
Description of drawings
Fig. 1 is the structural topology figure of prior art multimedia videoconferencing system;
Fig. 2 is the line configuring information schematic diagram of a terminal in the transmission line configuration method of the present invention;
Fig. 3 is the flow chart of transmission line configuration method first embodiment of the present invention;
Fig. 4 is the flow chart of transmission line configuration method second embodiment of the present invention;
Fig. 5 is the flow chart of transmission line configuration method the 3rd embodiment of the present invention.
Embodiment
At present, some nodes in the multimedia videoconferencing system, as each terminal, each subordinate MCU is (in a multimedia videoconferencing system, a main MCU is generally arranged, multimedia conferencing is carried out the master control effect, but the master control effect of general main MCU realizes by controlling a plurality of subordinate MCU, and then each subordinate MCU controls the communication that a plurality of terminals are carried out multimedia conferencing again, thereby the communication mechanism of realization differentiated control) equipment all can dispose polytype interface simultaneously, as the E1 interface, isdn interface and IP interface etc., after these nodes are received on the corresponding transmission line by every type interface, can be linked in the conference system by corresponding data communication network respectively, after connecting the E1 transmission line as these nodes by the E1 interface, can be linked in the multimedia videoconferencing system by E1 data private network; Certainly after these these nodes also can connect the IP transmission line by the IP interface, be linked in the multimedia videoconferencing system by IP network.Transmission line configuration method of the present invention is utilized the polytype interface that has had on existing these nodes just, and give to dispose relevant transmission line simultaneously, thereby be implemented in the whole process that meeting holds, when the current transmission line of node breaks down, other transmission lines of choosing that can be convenient, flexible are proceeded meeting, and needn't interrupt the purpose that process is held in meeting.
The prerequisite that realizes transmission line configuration method of the present invention is: before meeting is held, for all disposing simultaneously, each node (as each terminal, each subordinate MCU or each gateway etc.) that participates in a conference gives plurality of transmission lines, to form the line configuring information of corresponding each node.The circuit types of the plurality of transmission lines that each node is configured can be selected by user oneself, can select E1 transmission line, ISDN transmission line and IP transmission line for the terminal of oneself as certain user; And another user can select T1 transmission line, IP transmission line and ISDN transmission line or the like for the terminal of oneself.
Before meeting is held,, can in the SMC that can manage control, finish whole conference system for the operation of each the node configuration plurality of transmission lines that can join.After each node has been configured plurality of transmission lines, can form the line configuring information of correspondence self.Thinking each the terminal configuration plurality of transmission lines in the multimedia videoconferencing system below, is example with the line configuring information that forms corresponding each terminal, describes the collocation method of transmission line of the present invention in detail.
With reference to Fig. 2, this figure is the line configuring information schematic diagram of a terminal in the transmission line configuration method of the present invention, the line configuring information of terminal A comprises among the figure: terminal serial number, the transmission line of configuration (plurality of transmission lines for terminal A configuration is tactic with different priorities here), the relevant information of transmission line; Wherein A is the terminal serial number of this terminal; This terminal A has been configured three transmission lines that type is different, be respectively E1 transmission line, ISDN transmission line and IP transmission line, these three different transmission lines of type are tactic with different priorities, it is the highest promptly to come top E1 transmission line priority, ISDN transmission line priority is taken second place, and IP transmission line priority is minimum; Wherein the relevant information of E1 transmission line comprises: meeting place name, circuit types are E1, the transmission rate 128kbps of this E1 transmission line～parameters such as 1920kbps, certain information such as video protocols, video format, video frame rate and audio protocols that also comprise this time meeting; The relevant information of ISDN transmission line comprises: meeting place name, circuit types are ISDN, parameters such as the transmission rate 64kbps of this ISDN transmission line～512kbps and ISDN number, certain information such as method of calling, video protocols, video format, video frame rate and audio protocols that also comprise this time meeting; The relevant information of IP transmission line comprises: meeting place name, circuit types are IP, parameters such as the IP address of the transmission rate 128kbps of this IP transmission line～1920kbps and terminal and login name, certain information such as method of calling, video protocols, video format, video frame rate and audio protocols that also comprise this time meeting.The situation of the line configuring information of other-end repeats no more here with the situation of the line configuring information of terminal A among Fig. 2.
The user of each terminal can be in the line configuring information of above-mentioned each terminal of correspondence before meeting is held, the affiliation transmission line when an appointment transmission lines wherein begins as meeting in advance; If the user does not specifically specify the affiliation transmission line, then when meeting begins, choose the highest transmission line of line configuring information medium priority order that should terminal as the affiliation transmission line of this terminal when meeting begins.As above routine terminal A can specify in meeting in advance when beginning, insert conference system with the IP transmission line, then this moment need by the user of terminal A in advance the assigned ip transmission line as the affiliation transmission line of this terminal A, the affiliation transmission line when if the user of terminal A does not specifically specify before meeting is held and begun as meeting by which transmission lines, then when meeting began, automatically that the priority orders in the line configuring information of terminal A is the highest E1 transmission line was as the affiliation transmission line of this terminal A.
The line configuring information of wherein corresponding each terminal can be stored among the MCU, also can be stored in the management equipment as SMC etc., also can be stored in as in the node devices such as terminal, subordinate MCU.At first describe in detail below the line configuring information stores of corresponding each terminal in MCU, in the whole process that follow-up meeting is held (the meeting whole process of holding comprise meeting begin that process, meeting are held process and meeting adjourned process), transmission line breaks down, the process of the transmission line that more renews.With reference to Fig. 3, this figure is the flow chart of transmission line configuration method first embodiment of the present invention; Shown the process of changing transmission line in the whole process that whole process that meeting is held and meeting hold among the figure, its specific implementation process is as follows:
Step 100 is finished the operation into each terminal configuration plurality of transmission lines in SMC, thereby obtains the line configuring information of corresponding each terminal.
Step 110, after in step 100, obtaining the line configuring information of corresponding each terminal, when follow-up meeting begins to hold, SMC all is issued to MCU with the line configuring information of each terminal, MCU stores after receiving the line configuring information of each terminal, and its storage format can adopt the database form, also can adopt form, the purpose of its storage is the use of holding in order to follow-up other meetings.
Step 120, MCU selects the highest transmission line of priority orders (referring to that the user does not specify the situation of concrete affiliation transmission line in advance) respectively in the line configuring information of each terminal of correspondence of storage, or selects the preassigned affiliation transmission line of user.
Step 130, every transmission lines that MCU selects by step 120 respectively, call out corresponding each terminal one by one and insert meeting (also can insert meeting by terminal request MCU), this meeting just can normally be held then, and each terminal can be carried out mutual communication by the control of MCU.
Step 140, in the whole process that meeting is held (the meeting whole process of holding comprise meeting begin that the process of holding, meeting are held process and meeting adjourned process), MCU is by judging whether the transmission line that the time span that does not receive each terminal code stream detects corresponding each terminal breaks down; Wherein its criterion of the transmission line that type is different also is different, adopt the situation of E1 transmission line as terminal, as long as interior this terminal of time span that MCU detected about 10 seconds is not all sent code stream, then can reach a conclusion: the transmission line of this terminal breaks down; And if terminal adopts the IP transmission line, this terminal is not all sent code stream then to have only MCU to detect 1 minute to the time span of a few minutes, and then just can reach a conclusion: the transmission line of this terminal breaks down.
If MCU detects the transmission line of certain terminal and breaks down, then execution in step 150, do not break down if detect the transmission line of terminal, and then execution in step 190.
Step 150, MCU selects the highest transmission lines of current priority order in the line configuring information to the terminal that should transmission line breaks down of storage; Illustrate, as the terminal A among Fig. 2 after the transmission line E1 of current employing breaks down, to further the ISDN transmission line be selected substitute transmission line according to the highest rule of the priority orders of current available transmission line as the transmission line E1 that breaks down.
Step 160, the transmission line that MCU selects by step 150 be this terminal of breaking down of call transfer circuit again, so that this terminal can be linked in the conference system once more, proceeds meeting.
After the calling by MCU of step 170, this terminal is linked in the conference system, continue and other-end carries out the mutual of conference content, with proceeding of realization meeting.
Step 180, after this terminal is linked into conference system once more, the state information that MCU also will further communicate new transmission line and this terminal by this replacing feeds back to SMC, thereby makes under the control and management of SMC, and this terminal can keep synchronously with the other-end in the conference system.
Step 190, the transmission line of each terminal that participates in a conference all are normal, can continue the process of holding of meeting.
Certainly, plurality of transmission lines in the line configuring information of corresponding each terminal also not necessarily will be with the different priorities sequence arrangement, also can adopt the mode of random alignment, when needs are chosen transmission line, adopt corresponding algorithm or rule also can, its principle is concisely easily seen very much, repeats no more here.
Alleviate the live load of MCU in the whole process that meeting is held for considering, can not be stored in the line configuring information of corresponding each terminal among the MCU yet, but store in the whole process that meeting is held its live load into is not on the very big management level equipment, as SMC etc.With reference to Fig. 4, this figure is the flow chart of transmission line configuration method second embodiment of the present invention; All respective stored is in SMC for the line configuring information of each terminal among this figure, and its concrete implementation procedure is as follows:
If MCU detects the transmission line of certain terminal and breaks down, then execution in step 260, do not break down if detect the transmission line of terminal, and then execution in step 310.
After the calling by MCU of step 290, this terminal is linked in the conference system, continue and other-end carries out the mutual of conference content, with proceeding of realization meeting.
Certainly, the line configuring information of corresponding each terminal also can further store in each corresponding terminal, promptly stored the line configuring information of self by each terminal, this is because each terminal self also has certain storage capacity, the line configuring information of the storage self of can loading.With reference to Fig. 5, this figure is the flow chart of transmission line configuration method the 3rd embodiment of the present invention; Wherein the line configuring information respective stored of each terminal is in each terminal of correspondence, and the process of holding of follow-up meeting is as follows:
After the transmission line that step 430, this terminal detect self breaks down, in the line configuring information of self storage, select the highest transmission line of current priority order, and be linked in the meeting again with the transmission line that this selects.
Above-mentioned the line configuring information that forms corresponding each terminal is example just with to each the terminal configuration plurality of transmission lines in the multimedia videoconferencing system, describes transmission line configuration method of the present invention in detail.And in the transmission line configuration method of the present invention, identical as situation with above-mentioned situation to each terminal configuration plurality of transmission lines to nodes such as other subordinates MCU, gateway configuration plurality of transmission lines, therefore just no longer too much give unnecessary details here.
Certainly, the line configuring information of above-mentioned each node of correspondence except that can be kept among the MCU, among the SMC or for example in the node of terminal, subordinate MCU etc., can also be kept in any other equipment that storage capacity arranged, as long as guarantee when needs are changed transmission line, can be from the equipment of the line configuring information that stores corresponding each node accordingly, find corresponding transmission line, and, can further call out the affiliation of this node or this node again by MCU and can insert meeting again and get final product based on this transmission line that finds.
To sum up, by in advance each node being carried out the configuration of plurality of transmission lines, thereby can be implemented in the whole process that meeting holds, if chance failure appears in the current transmission line of node, and needn't temporarily interrupt the process that meeting is held earlier, the replacing operation of realization transmission line that just can be convenient, flexible.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1, a kind of transmission line configuration method is used for multimedia videoconferencing system, it is characterized in that, described method comprises the following steps:
(1) is each node configuration plurality of transmission lines in the described multimedia videoconferencing system, to form the line configuring information of corresponding each node;
(2) in the whole process that meeting is held, if the current transmission line of arbitrary node breaks down, then the line configuring information of the transmission line place node that breaks down according to correspondence selects an other transmission lines and proceeds meeting from the plurality of transmission lines that is disposed for the described transmission line place node that breaks down.
2, transmission line configuration method according to claim 1 is characterized in that,
In described step (1), press the different priorities order and be each node configuration plurality of transmission lines;
In described step (2), from the different priorities plurality of transmission lines in proper order that is disposed for the described transmission line place node that breaks down, select the highest transmission lines of current priority order and proceed meeting.
3, transmission line configuration method according to claim 2, it is characterized in that, described step further comprises in (1): in the plurality of transmission lines of each node configuration, specify the affiliation transmission line of a transmission lines as corresponding each node in advance respectively.
4, transmission line configuration method according to claim 3 is characterized in that, in the described step (1), is the plurality of transmission lines of each node configuration different priorities order by Service Management Center.
5, transmission line configuration method according to claim 4 is characterized in that, also comprises between described step (1) and the step (2):
(1.1a) when meeting begins to hold, Service Management Center is issued to multipoint control unit with the line configuring information of each node;
(1.2a) multipoint control unit is stored after receiving the line configuring information of each node, and in the line configuring information of corresponding each node, select the highest transmission line of priority orders or preassigned affiliation transmission line respectively, to call out corresponding each node affiliation.
6, transmission line configuration method according to claim 5, it is characterized in that, described step further comprises in (2): if the current transmission line of arbitrary node breaks down, then multipoint control unit is in the line configuring information of the transmission line place node that the correspondence of storing breaks down, different priorities order according to corresponding plurality of transmission lines, select the highest transmission lines of current priority order, and call out the described transmission line place node that breaks down again by this transmission line that selects, make the described transmission line place node that breaks down proceed meeting.
7, transmission line configuration method according to claim 4 is characterized in that: also comprise the step that Service Management Center is stored the line configuring information of corresponding each node in the described step (1).
8, transmission line configuration method according to claim 7 is characterized in that, also comprises between described step (1) and the step (2):
(1.1) when meeting begins to hold, Service Management Center is according to the line configuring information of each node of correspondence of storage, select the highest transmission line of priority orders or preassigned affiliation transmission line respectively, and the relevant information of the every transmission lines that selects is issued to multipoint control unit;
(1.2) multipoint control unit is called out corresponding each node affiliation by every transmission lines respectively according to the relevant information of the every transmission lines that receives.
9, transmission line configuration method according to claim 8 is characterized in that, described step further comprises in (2):
(2.1) in the whole process that meeting is held, if the current transmission line of arbitrary node breaks down, then Service Management Center is according to the line configuring information of the transmission line place node that breaks down of correspondence of storage, different priorities order according to corresponding plurality of transmission lines, select the highest transmission lines of current priority order, and the relevant information of this transmission line that will select is issued to multipoint control unit;
(2.2) multipoint control unit is called out the described transmission line place node that breaks down by this transmission line, so that the described transmission line place node that breaks down can be proceeded meeting again according to the relevant information of this transmission line that receives.
10, transmission line configuration method according to claim 9, it is characterized in that, described step further comprises in (2.1): in the whole process that meeting is held, if the current transmission line of arbitrary node breaks down, then upgrade transmission line by multipoint control unit requested service administrative center.
11, transmission line configuration method according to claim 9, it is characterized in that the relevant information of the described transmission line that selects comprises: the method for calling of the transmission rate of the circuit types of the transmission line that selects, the transmission line that selects and the transmission line that selects.
12, transmission line configuration method according to claim 3, it is characterized in that, described step further comprises in (1): each node in the described multimedia videoconferencing system is self configuration plurality of transmission lines, forming the line configuring information of corresponding self node, and with the line configuring information stores of corresponding self node.
13, transmission line configuration method according to claim 12, it is characterized in that, described step further comprises in (2): break down if arbitrary node detects current self transmission line, the transmission line place node that then breaks down is according to the line configuring information of storage, different priorities order according to corresponding plurality of transmission lines, select the highest transmission lines of current priority order, and pass through this transmission line that selects and insert meeting again.
14, according to claim 6,9 or 13 described transmission line configuration methods, it is characterized in that, described step (2) also comprises afterwards: multipoint control unit is with current transmission line by choosing again, and the state information that communicates with the described transmission line place node that breaks down feeds back to Service Management Center.
According to claim 6 or 9 described transmission line configuration methods, it is characterized in that 15, multipoint control unit is by judging that the time span that does not receive the arbitrary node code stream detects the current transmission line of described arbitrary node and whether breaks down.
According to the described transmission line configuration method of the arbitrary claim of claim 1～13, it is characterized in that 16, described each node is the terminal in the multimedia videoconferencing system, or be the subordinate multipoint control unit in the multimedia videoconferencing system.
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| CNB2003101230394A CN100334882C (en) | 2003-12-23 | 2003-12-23 | Method of transmission line configuration |
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| CNB2003101230394A CN100334882C (en) | 2003-12-23 | 2003-12-23 | Method of transmission line configuration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101557498B (en) * | 2009-05-21 | 2011-03-16 | 中兴通讯股份有限公司 | Method and device for controlling videoconference terminal communication |
| CN101895716B (en) * | 2010-05-25 | 2014-11-05 | 中兴通讯股份有限公司 | Circuit switching method for remote presence system and multi-point control unit |
| CN108040218A (en) * | 2017-12-20 | 2018-05-15 | 苏州科达科技股份有限公司 | The means of communication and communication apparatus of a kind of video conference |
| CN109561072B (en) * | 2018-10-29 | 2021-06-11 | 视联动力信息技术股份有限公司 | Link detection method and system |
| CN109587432A (en) * | 2018-10-29 | 2019-04-05 | 视联动力信息技术股份有限公司 | A kind of conference speech terminal switching method and system |
| CN109889760A (en) * | 2019-02-12 | 2019-06-14 | 视联动力信息技术股份有限公司 | Terminal control method and device |
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