CN101931791B - Intercom system terminal device as well as intercom system and communication method thereof - Google Patents
Intercom system terminal device as well as intercom system and communication method thereof Download PDFInfo
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- CN101931791B CN101931791B CN2009101081838A CN200910108183A CN101931791B CN 101931791 B CN101931791 B CN 101931791B CN 2009101081838 A CN2009101081838 A CN 2009101081838A CN 200910108183 A CN200910108183 A CN 200910108183A CN 101931791 B CN101931791 B CN 101931791B
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Abstract
The invention discloses an intercom system terminal device as well as an intercom system and a communication method thereof. The intercom system terminal device comprises an input device for inputting terminal information, an IP acquisition module, a processor and a communication module, wherein the IP acquisition module is used for using a polling list mode to acquire IP address information according to received terminal information; the processor is used for receiving the terminal information input by the input device, sending the terminal information to the IP acquisition module and sending communication command information to the communication module when acquiring the IP address information; and the communication module is used for sending communication data to a terminal device corresponding to the IP address information according to received communication command information or receiving communication data from Internet. In the invention, the IP address information is acquired through using an IP polling mechanism inside a terminal, thus ensuring the normal operation of communication work of cell visual intercom systems in the condition that the work of a server is interrupted.
Description
Technical field
The present invention relates to the intercom system technical field that the sub-district communication is used, what be specifically related to is a kind of intercom system terminal installation and the intercom system and the means of communication thereof.
Background technology
Along with the development of house market, special in the dwelling house of China, the simulation video intercom is progressively to digital visual intercommunication transition, and communication network also becomes standardized TCP/IP network; The whole network architecture is simple, and construction, maintenance cost is low, and termination function is also very abundant, for residential customer brings great convenience.
Communication on the internet generally needs relevant agreement, and SIP (soft switch) agreement is adopted in present most of network communications, and its communication mechanism is as shown in Figure 1, comprises that a plurality of communication apparatus M, N, Q and S are connected with sip server respectively.Specific descriptions are: certain starting up of terminal, it can obtain this terminal dynamically or static ip address, then, it is registered to SIP registrar server, if do not have terminal call it the time, it can be in wait state; And at set intervals, its can send heartbeat message to registrar, and expression is own online, and server can not receive the heartbeat message of equipment at a fixed time, will think equipment off-line; If terminal M thinks and terminal N communication that he can initiate query requests to the SIP service, whether inquiry terminal N is online, the information such as IP address of terminal N; Deng the relevant information that obtains terminal N; He understands being connected of directly foundation and terminal N, and the beginning communication is if communication finishes; Also can send relevant communication END instruction by a server, represent that present terminal M and N all are in idle condition.
On the internet, operated by rotary motion such as registrar have good operational environment (constant temperature and humidity) at the IDC center; UPS is arranged, the phenomenon of cutting off the power supply can not occur, have the special messenger to monitor; Server has backup; If a station server has fault, system can change backup server automatically over to, will guarantee that like this communication system runs well for a long time.
Based on the digital network visible dialogue system of sub-district, generally also be to adopt similar mechanism to accomplish communication.Because its maintenance cost is too high, in order to reduce cost, the sub-district property generally selects for use common PC as server, and after server worked long hours like this, server very easily broke down.If server failure can cause whole sub-district intercommunication communication paralysis, the communication of having no idea of all terminals.Especially, because have no idea communication, the door of unit (electronic lock) also can not lean on intercom system normally to open.
Therefore, be necessary prior art is done further to improve.
Summary of the invention
The object of the present invention is to provide under a kind of situation that can be implemented in the server interruption of work, guarantee intercom system terminal installation and the intercom system and the means of communication thereof of the normal operation of sub-district intercommunication communication work.
To achieve these goals, the present invention adopts following technical scheme:
The invention provides a kind of intercom system terminal installation, wherein, comprise input equipment, IP acquisition module, communication module, and the processor that connects said input equipment, IP acquisition module and communication module, wherein,
Said input equipment is used for input terminal information;
Said IP acquisition module is used for according to the end message that receives, and adopts the question blank mode to obtain corresponding IP address information;
Said processor is used to receive the end message of said input equipment input, and this end message is sent to said IP acquisition module, when obtaining said IP address information, sends communication instruction information to said communication module;
Said communication module is used for sending communication data according to the communication instruction information that receives to the address information of IP described in network terminal device corresponding, perhaps receives the communication data of automatic network.
Intercom system terminal installation of the present invention, wherein, said IP acquisition module comprises:
Information acquisition unit is used to obtain the tabulation of IP address information;
Query unit is used for reception and deposits said IP address information tabulation, and according to the end message that receives, through inquiring about said IP address information tabulation, obtains corresponding IP address information.
Intercom system terminal installation of the present invention, wherein, said IP address information tabulation comprises:
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the indoor set IP address information tabulation that each numbers corresponding IP address information;
Comprise the indoor set in the scheduled unit and all enclosure wall machines, the number information of supervisor and the doorway machine IP address information tabulation that each numbers corresponding IP address information on the network;
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the enclosure wall machine IP address information tabulation that each numbers corresponding IP address information; With
Comprise the number information of all indoor sets, doorway machine, enclosure wall machine in the network and the supervisor IP address information tabulation that each numbers corresponding IP address information.
The intercom system that the communication of a kind of sub-district is used; Wherein, Comprise the server that at least two intercom system terminal installations and link to each other with said intercom system terminal installation, connect mutually between the said intercom system terminal installation and set up a communication network that said server is used to receive log-on message and the storage that each intercom system terminal installation sends; And for each intercom system terminal installation provides corresponding tabulation of IP address information and link Communications service, each intercom system terminal installation comprises:
Input equipment is used for input terminal information;
The IP acquisition module is used for according to the end message that receives, and adopts the question blank mode to obtain corresponding IP address information;
Processor is used to receive the end message of said input equipment input, and this end message is sent to said IP acquisition module, when obtaining said IP address information, sends communication instruction information to said communication module; With
Communication module is used for sending communication data according to the communication instruction information that receives to the address information of IP described in network terminal device corresponding, perhaps receives the communication data of automatic network.
Intercom system of the present invention, wherein, said IP acquisition module comprises:
Information acquisition unit is used to obtain the tabulation of IP address information;
Query unit is used for reception and deposits said IP address information tabulation, and according to the end message that receives, through inquiring about said IP address information tabulation, obtains corresponding IP address information.
Intercom system of the present invention, wherein, said IP address information tabulation comprises:
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the indoor set IP address information tabulation that each numbers corresponding IP address information;
Comprise the indoor set in the scheduled unit and all enclosure wall machines, the number information of supervisor and the doorway machine IP address information tabulation that each numbers corresponding IP address information on the network;
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the enclosure wall machine IP address information tabulation that each numbers corresponding IP address information; With
Comprise the number information of all indoor sets, doorway machine, enclosure wall machine in the network and the supervisor IP address information tabulation that each numbers corresponding IP address information.
Intercom system of the present invention; Wherein, Said intercom system terminal installation obtains corresponding indoor set IP address information tabulation, the tabulation of doorway machine IP address information or the tabulation of enclosure wall machine IP address information from server respectively during as indoor set, doorway machine or enclosure wall machine.
A kind of means of communication of sub-district communication intercom system wherein, may further comprise the steps:
A, intercom system terminal installation obtain the corresponding IP address information list from server;
B, through dialogue initiator terminal installation input equipment, obtain dialogue side's end message;
C, according to dialogue side's end message, through the inner IP address information tabulation of inquiry session initiator terminal installation, obtain the IP address information of dialogue side's terminal installation;
D, according to the IP address information of dialogue side's terminal installation, set up the communication link of dialogue both sides terminal installation.
Method of the present invention, wherein, said steps A may further comprise the steps:
A1, indoor set are obtained number information that comprises all doorway machine, enclosure wall machine, supervisor in the network and the indoor set IP address information tabulation that each numbers corresponding IP address information;
Doorway machine obtains and comprises the indoor set in the scheduled unit and all enclosure wall machines, the number information of supervisor and the doorway machine IP address information tabulation that each numbers corresponding IP address information on the network;
The enclosure wall machine is obtained number information that comprises all doorway machine, enclosure wall machine, supervisor in the network and the enclosure wall machine IP address information tabulation that each numbers corresponding IP address information;
Supervisor is obtained number information that comprises all indoor sets, doorway machine, enclosure wall machine in the network and the supervisor IP address information tabulation that each numbers corresponding IP address information.
Method of the present invention, wherein, said step C may further comprise the steps:
C1, when initiating dialogue side and dialogue side when being indoor set; The initiator is according to dialogue side's end message in dialogue; Through inquiring about own inner indoor set IP address information tabulation; Obtain the IP address information of the doorway machine of unit, indoor set place, dialogue side, from this doorway machine, obtain the IP address information of dialogue side's terminal installation.
The present invention is through being provided with the IP enquiry module on each terminal installation in intercom system; When each terminal installation powers on; Can obtain the IP address information tabulation of other-end from the webserver, make each terminal installation realize the IP address lookup in inside, thereby set up communication link with dialogue side.When situation that server breaks down, also can realize two communications between the terminal installation.Under the situation of not using special-purpose server; Can guarantee that also sub-district intercom system communication is smooth and easy; Reduced the cost of equipment maintenance of intercom system simultaneously, and, reduced the resource that information list takies in the terminal through distributed storage information list and tree-shaped inquiry mechanism.
Description of drawings
Fig. 1 is the structural representation of internet communication system in the prior art;
Fig. 2 is an intercom system terminal installation structural representation one of the present invention;
Fig. 3 is an intercom system terminal installation structural representation two of the present invention;
Fig. 4 is the structural representation of intercom system of the present invention.
Embodiment
Below will combine accompanying drawing, specify concrete implementation of the present invention.
The intercom system terminal installation of the embodiment of the invention is as shown in Figure 2, and it comprises: input equipment 210, IP acquisition module 230, communication module 240, and the processor 220 that connects said input equipment 210, IP acquisition module 230 and communication module 240.Wherein, input equipment 210 is used for input terminal information; IP acquisition module 230 is used for according to the end message that receives, and adopts the question blank mode to obtain corresponding IP address information.Processor 220 is used to receive the end message of said input equipment 210 inputs, and this end message is sent to said IP acquisition module 230, after obtaining said IP address information, sends communication instruction information to said communication module 240.Communication module 240 is used for sending communication data according to the communication instruction information that receives to the address information of IP described in network terminal device corresponding, perhaps receives the communication data of automatic network.The intercom system terminal installation of present embodiment also has equipment such as video, audio frequency, and these existing intercommunication terminals all have, and its decoding method has been solidificated on the relevant hardware structure, does not elaborate at this.
Above-mentioned intercom system terminal installation can be indoor set, doorway machine, enclosure wall machine or supervisor; Input equipment 240 can be keyboard or touch-screen; The terminal installation that the user need engage in the dialogue through the input equipment selection; The relevant terminal numbering is discerned and exported to processor 220 to its input information, and be sent to the IP acquisition module.End message wherein is the unique number information at each terminal.In the same sub-district, the position at intercommunication terminal is generally fixed, for example: the doorway machine of xx xx unit; The xx supervisor, xx enclosure wall machine, xx layer xx family, xx xx unit indoor set; Can use separately Position Number as the call number at terminal, counterpart terminal device one by one.As: the numbering of the doorway machine of 11 unit can be designated as " 11 unit "; The indoor set at 1 layer of 1 family, 11 unit can be designated as " 1 layer of 1 family, 11 unit ".
For realizing that the inner mode of inquiry that adopts obtains the IP address information, as shown in Figure 3, IP acquisition module 230 can comprise the information acquisition unit 231 that is used to obtain the tabulation of IP address information; And query unit 232, be used for reception and deposit said IP address information tabulation, and,, obtain the corresponding IP address information in terminal of being visited through inquiring about said IP address information tabulation according to the end message that receives.Dynamic IP addressing information or fixed ip address information that IP address information tabulation wherein can obtain for the server from intercom system.
And in the IP address information tabulation, comprise foregoing terminal number information and corresponding IP address information with it at least.For the memory resource of saving each terminal installation, obtain inquiry velocity faster, the IP address information can adopt the distributed storage mode in each terminal installation, and adopts the inquiry mechanism that is similar to tree-shaped inquiry.Be specially, obtain number information that comprises all doorway machine in the network, enclosure wall machine, supervisor and the indoor set IP address information tabulation that each numbers corresponding IP address information at indoor set; Doorway machine obtains and comprises the indoor set in the scheduled unit on the network; With the number information of all enclosure wall machines, supervisor and the doorway machine IP address information tabulation that each numbers corresponding IP address information; Be meant in this scheduled unit that every unit correspondence obtains the number information IP address information corresponding with each numbering that comprises indoor set in the own unit; The enclosure wall machine is obtained number information that comprises all doorway machine, enclosure wall machine, supervisor in the network and the enclosure wall machine IP address information tabulation that each numbers corresponding IP address information; Supervisor is obtained number information that comprises all doorway machine, enclosure wall machine in the network and the supervisor IP address information tabulation that each numbers corresponding IP address information.
Employing with upper type distributed store IP address after; When the indoor set a at 1 layer of 1 family, 11 unit need carry out communication with the indoor set b at 2 layer of 1 family, 22 unit; The indoor set a at 1 layer of 1 family, 11 unit can inquire about the IP address information of doorway machine c of 22 unit, indoor set b place at 2 layer of 1 family, 22 unit in inside, 10.120.105.20 for example, and send communication instruction information to doorway machine c; IP address information to its inquiry indoor set b; After doorway machine c receives this communication instruction information, the IP address information of the indoor set of portion's inquiry within it b, as obtain 10.120.105.6; And this IP address information fed back to the indoor set a at 1 layer of 1 family, 11 unit, indoor set a sets up the communication link with the indoor set b at 2 layer of 1 family, 22 unit according to the IP address information of receiving.
The sub-district intercom system that the present invention also provides the communication of a kind of sub-district to use; As shown in Figure 4; It comprises a plurality of intercom system terminal installations 300 and a server 500; Between the intercom system terminal installation 300 and with server between be connected mutually through bus 400, this server 500 is mainly used in and receives log-on message and the storage that each intercom system terminal installation 300 sends, and for each intercom system terminal installation 300 the link Communications service is provided.Wherein log-on message comprises: the information such as Position Number tabulation that the MAC of cell terminal, IP address and terminal are corresponding.When each intercom system terminal installation 300 powers on (start); Will be to these server 500 transmissions log-on message separately; And from server 500, obtain the IP address information that needs and tabulate; And being kept in oneself the IP acquisition module subsequent usely, the required corresponding IP address information tabulation of obtaining in concrete terminal can be referring to the description of front for appropriate section in the intercom system terminal installation.
Be example with the communication between the indoor set below, specifically describe the workflow of the intercom system in the present embodiment:
At first set up server, all terminals of registration mainly are the MAC Addresss at each terminal in server, perhaps the correspondence table of IP address information and each terminal number;
Then open at the terminal, and with the MAC Address at terminal, perhaps the IP address information is to server registration, and server obtains the tabulation of the MAC, IP address information at all terminals, sub-district etc.;
Server sends IP address information list information to relevant terminal again;
When server normally uses, can be on dialogue initiator terminal input need the end message of dialogue, this dialogue initiator terminal elder generation sends request to server, the IP address information of inquiry session side, obtain the IP address information after, to conversational terminal initiation communication;
If server failure; Belong to the IP address information of the doorway machine of unit in dialogue initiator terminal inner inquiry session side; Doorway machine initiation request to unit, place, dialogue side; Obtain the IP address information of dialogue side,, set up the communication between two indoor sets according to the IP address information of the dialogue side that obtains.Object lesson can be referring to the description of front about indoor set in the intercom system terminal installation and indoor set communication part.
In the above example; When the both sides that need communication are indoor set and doorway machine, indoor set and enclosure wall machine or indoor set and supervisor; Because indoor set has comprised the IP address information of all doorway machine, supervisor and enclosure wall machine from the IP address information tabulation that server obtains; Therefore can set up both sides' communication link directly in the IP of inner inquiry session side address information.For example: what need communication is the indoor set doorway machine corresponding with its unit, place; When server failure; In the time of need carrying out communication with the doorway machine d of 12 unit like the indoor set a when 1 layer of 1 family, 11 unit, the indoor set a at 1 layer of 1 family, 11 unit can inquire about the IP address information of the doorway machine d of 12 unit, for example 10.120.103.21 in inside; Send communication instruction information to doorway machine d again, set up communication link with doorway machine d.
In sum; The present invention is through being provided with the IP enquiry module on each terminal installation in intercom system; When each terminal installation powers on; Can obtain the IP address information tabulation of other-end from the webserver, make each terminal installation realize the IP address lookup in inside, thereby set up communication link with dialogue side.When situation that server breaks down, also can realize two communications between the terminal installation, and, reduce the resource that information list takies in the terminal through distributed storage information list and tree-shaped inquiry mechanism.Under the situation of not using special-purpose server, can guarantee that also sub-district intercom system communication is smooth and easy, has reduced the cost of equipment maintenance of intercom system simultaneously.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and these improvement and conversion all should belong to the protection range of accompanying claims of the present invention according to above-mentioned explanation.
Claims (10)
1. an intercom system terminal installation is characterized in that, comprises input equipment, IP acquisition module, communication module, and the processor that connects said input equipment, IP acquisition module and communication module, wherein,
Said input equipment is used for input terminal information;
Said IP acquisition module is used for according to the end message that receives, and adopts the question blank mode to obtain corresponding IP address information;
Said processor is used to receive the end message that said input equipment is imported, and this end message is sent to said IP acquisition module, after obtaining said IP address information, sends communication instruction information to said communication module;
Said communication module is used for sending communication data according to the communication instruction information that receives to said IP address information terminal device corresponding, perhaps receives the communication data of automatic network;
Said IP address information adopts the distributed storage mode in terminal installation, and adopts the inquiry mechanism of tree-shaped inquiry.
2. intercom system terminal installation according to claim 1 is characterized in that, said IP acquisition module comprises:
Information acquisition unit is used to obtain the tabulation of IP address information;
Query unit is used for reception and deposits said IP address information tabulation, and according to the end message that receives, through inquiring about said IP address information tabulation, obtains corresponding IP address information.
3. intercom system terminal installation according to claim 2 is characterized in that, said IP address information tabulation comprises:
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the indoor set IP address information tabulation that each numbers corresponding IP address information;
Comprise the indoor set in the scheduled unit and all enclosure wall machines, the number information of supervisor and the doorway machine IP address information tabulation that each numbers corresponding IP address information on the network;
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the enclosure wall machine IP address information tabulation that each numbers corresponding IP address information; With
Comprise the number information of all indoor sets, doorway machine, enclosure wall machine in the network and the supervisor IP address information tabulation that each numbers corresponding IP address information.
4. intercom system that the sub-district communication is used; It is characterized in that; Comprise the server that at least two intercom system terminal installations and link to each other with said intercom system terminal installation; Connect mutually between the said intercom system terminal installation and set up a communication network; Said server is used to receive log-on message and the storage that each intercom system terminal installation sends, and for each intercom system terminal installation provides corresponding tabulation of IP address information and link Communications service, each intercom system terminal installation comprises:
Input equipment is used for input terminal information;
The IP acquisition module is used for according to the end message that receives, and adopts the question blank mode to obtain corresponding IP address information;
Processor is used to receive the end message of said input equipment input, and this end message is sent to said IP acquisition module, when obtaining said IP address information, sends communication instruction information to said communication module;
Communication module is used for sending communication data according to the communication instruction information that receives to the address information of IP described in network terminal device corresponding, perhaps receives the communication data of automatic network;
Said IP address information adopts the distributed storage mode in terminal installation, and adopts the inquiry mechanism of tree-shaped inquiry.
5. intercom system according to claim 4 is characterized in that, said IP acquisition module comprises:
Information acquisition unit is used to obtain the tabulation of IP address information;
Query unit is used for reception and deposits said IP address information tabulation, and according to the end message that receives, through inquiring about said IP address information tabulation, obtains corresponding IP address information.
6. intercom system according to claim 5 is characterized in that, said IP address information tabulation comprises:
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the indoor set IP address information tabulation that each numbers corresponding IP address information;
Comprise the indoor set in the scheduled unit and all enclosure wall machines, the number information of supervisor and the doorway machine IP address information tabulation that each numbers corresponding IP address information on the network;
Comprise the number information of all doorway machine, enclosure wall machine, supervisor in the network and the enclosure wall machine IP address information tabulation that each numbers corresponding IP address information; With
Comprise the number information of all indoor sets, doorway machine, enclosure wall machine in the network and the supervisor IP address information tabulation that each numbers corresponding IP address information.
7. intercom system according to claim 6; It is characterized in that; Said intercom system terminal installation obtains corresponding indoor set IP address information tabulation, the tabulation of doorway machine IP address information or the tabulation of enclosure wall machine IP address information from server respectively during as indoor set, doorway machine or enclosure wall machine.
8. the means of communication of a sub-district communication intercom system is characterized in that, may further comprise the steps:
A, intercom system terminal installation obtain the corresponding IP address information list from server;
B, through dialogue initiator terminal installation input equipment, obtain dialogue side's end message;
C, according to dialogue side's end message, through the inner IP address information tabulation of inquiry session initiator terminal installation, obtain the IP address information of dialogue side's terminal installation;
D, according to the IP address information of dialogue side's terminal installation, set up the communication link of dialogue both sides terminal installation;
Said IP address information adopts the distributed storage mode in terminal installation, and adopts the inquiry mechanism of tree-shaped inquiry.
9. method according to claim 8 is characterized in that, said steps A may further comprise the steps:
A1, indoor set are obtained number information that comprises all doorway machine, enclosure wall machine, supervisor in the network and the indoor set IP address information tabulation that each numbers corresponding IP address information;
Doorway machine obtains and comprises the indoor set in the scheduled unit and all enclosure wall machines, the number information of supervisor and the doorway machine IP address information tabulation that each numbers corresponding IP address information on the network;
The enclosure wall machine is obtained number information that comprises all doorway machine, enclosure wall machine, supervisor in the network and the enclosure wall machine IP address information tabulation that each numbers corresponding IP address information;
Supervisor is obtained number information that comprises all indoor sets, doorway machine, enclosure wall machine in the network and the supervisor IP address information tabulation that each numbers corresponding IP address information.
10. method according to claim 9 is characterized in that, said step C may further comprise the steps:
C1, when initiating dialogue side and dialogue side when being indoor set; The initiator is according to dialogue side's end message in dialogue; Through inquiring about own inner indoor set IP address information tabulation; Obtain the IP address information of the doorway machine of unit, indoor set place, dialogue side, from this doorway machine, obtain the IP address information of dialogue side's terminal installation.
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| CN2009101081838A CN101931791B (en) | 2009-06-24 | 2009-06-24 | Intercom system terminal device as well as intercom system and communication method thereof |
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| CN2009101081838A CN101931791B (en) | 2009-06-24 | 2009-06-24 | Intercom system terminal device as well as intercom system and communication method thereof |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102710637B (en) * | 2012-05-30 | 2014-12-10 | 福建星网视易信息系统有限公司 | Method for finishing communication between door phone and inner phones based on Ethernet communication protocol |
| CN103856570B (en) * | 2012-11-29 | 2018-11-13 | 海尔集团公司 | Multi-screen interactive call control method, main equipment and control system |
| CN102984291A (en) * | 2012-11-30 | 2013-03-20 | 广东安居宝数码科技股份有限公司 | Addressing method based on building intercom system, terminal and building intercom system |
| CN108665583B (en) * | 2017-03-28 | 2021-11-23 | 杭州海康威视数字技术股份有限公司 | Information association method and device |
| CN107659571A (en) * | 2017-09-30 | 2018-02-02 | 北京千丁互联科技有限公司 | A kind of community's equipment and realize to the method for unlocking of making peace |
| CN108471440B (en) * | 2018-03-15 | 2021-04-30 | 广东聚光电子科技有限公司 | Digital talkback method and system |
| CN108848494A (en) * | 2018-06-08 | 2018-11-20 | 山东超越数控电子股份有限公司 | A kind of handheld device centralized management system and method |
| CN114157676B (en) * | 2021-12-10 | 2024-06-07 | 善理通益信息科技(深圳)有限公司 | Public network intercom communication method and system based on intranet server |
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| CN101115215A (en) * | 2006-07-24 | 2008-01-30 | 福建省冠林科技有限公司 | Remote intercommunication structure for interphone |
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