CN108270729B - System and method for realizing intercommunication between IP telephone and interphone system through multicast - Google Patents
System and method for realizing intercommunication between IP telephone and interphone system through multicast Download PDFInfo
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- CN108270729B CN108270729B CN201611260316.XA CN201611260316A CN108270729B CN 108270729 B CN108270729 B CN 108270729B CN 201611260316 A CN201611260316 A CN 201611260316A CN 108270729 B CN108270729 B CN 108270729B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
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Abstract
The invention discloses a system and a method for realizing intercommunication between an IP telephone and an interphone system through multicast, wherein the system for realizing the intercommunication between the IP telephone and the interphone system through multicast comprises an interphone application server, an interphone connection server and an interphone; the talkback application server comprises a configuration management module, a soft switch communication module, a media stream multicast module and a control protocol module; the interphone connecting server comprises a media stream multicast transceiving module and a control module; the method for realizing the intercommunication between the IP telephone and the interphone system through the multicast comprises the following steps: step one, a user picks up the phone to dial, step two, a telephone terminal is connected with a soft switch, step three, the soft switch communicates with an talkback application server, and step four, the talkback application server waits for a telephone user to press keys and the like. The invention can realize remote talkback and seamless communication.
Description
Technical Field
The present invention relates to a system and a method for realizing the intercommunication between an IP phone and an intercom system through multicast, and more particularly, to a system and a method for realizing the intercommunication between an IP phone and an intercom system through multicast.
Background
The interphone system is widely applied to various industries and different places: airports, bars, construction sites, KTV, dispatch, etc. are relatively noisy. It should be said that these local interphones have higher practicality and greater effect.
But the defects of the interphone are also obvious: that is, the communication distance is short, and people can communicate only within the range that the interphone can radiate. For example, a company has two branches, namely beijing and shanghai, and when the beijing company has an emergency and needs to immediately notify an interphone person at a certain department of the shanghai company, what is needed is that the conventional method firstly contacts the relevant person at the shanghai through a telephone, a mail or other communication ways, and then the relevant person at the shanghai calls a talkback group at the certain department through the interphone at hand, so that the process is not efficient and the problems of unclear transfer and the like may exist.
With the rapid development of networks, the traditional analog telephone system has been gradually replaced by the IP (internet protocol) telephone system, and most companies with certain scales now adopt the IP telephone system, so if we invented a method capable of communicating the telephone system and the intercom system, the above-mentioned problems can be solved. The number of interphone equipment is reduced, the limitation of regions and distances is broken through, direct conversation between remote personnel and interphone personnel is achieved, and efficiency is greatly improved.
As is known, a dispatch system plays a very important role in some industries, a dispatcher contacts and allocates telephone users, mobile phone users and intercom set resources through a dispatch desk, the current traditional practice is that the dispatch desk is provided with a dispatch telephone and an intercom, when the telephone users need to be notified, the dispatch telephone is used, and when the intercom set needs to be notified, the intercom is used for calling, and the defects are obvious: the dispatching equipment is many, and the operation process is loaded down with trivial details to can not realize the interconnection of telephone subscriber and intercom set.
In summary, in the remote communication of the intercom, there are many disadvantages in the application of the dispatch system for the interconnection and intercommunication between the telephone system and the intercom system, so there is a need for improvement.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a system and a method for realizing the intercommunication between an IP telephone and an interphone system through multicast, which can realize remote talkback and seamless communication.
The invention solves the technical problems through the following technical scheme: a system for implementing IP telephone and intercom system intercommunication by multicast, comprising:
the talkback application server is used for storing the information of the whole system and carrying out communication service and is used for supporting the talkback function of one talkback application server and a plurality of interphones;
the interphone connecting server is connected with the interphone application server and used for receiving and controlling interphone signals;
the interphone is connected with the interphone connecting server and used for being connected with the common interphone on the interphone connecting server and can be communicated with all the interphones in the same frequency channel.
Preferably, the intercom application server includes:
the configuration module is connected with the soft switch communication module and used for carrying out registration authentication on the user, opening the related configuration authority and configuring the soft switch communication service parameters;
the soft switch communication module is connected with the media stream multicast module and is used for communicating with a soft switch system telephone system;
the media stream multicast module is connected with the control protocol module, receives the media stream from the telephone terminal according to the address and the port negotiated by the soft switch communication module, decodes the media stream according to different coding formats, and sends the media stream to the interphone connection server in a multicast mode after the media stream is processed;
and the control protocol module is used for communicating with the interphone connecting server.
Preferably, the interphone connection server includes:
the media stream multicast receiving and transmitting module is connected with the control module and used for receiving the multicast media stream from the media stream multicast module in the talkback application server and converting the multicast media stream into a sound signal which can be accepted by the talkback, and simultaneously receiving the sound signal from the talkback and converting the sound signal into a digital media stream for multicast to the media stream multicast module in the talkback application server;
and the control module is used for receiving a control signaling of the control protocol module in the talkback application service.
The invention also provides a method for realizing the intercommunication between the IP telephone and the interphone system through multicast, which comprises the following steps:
step one, the user picks up the phone and dials, transfer to step two;
step two, the telephone terminal connects the soft switch, change step three;
step three, the soft switch communicates with the talkback application server, if the soft switch system can not find the corresponding talkback group, the voice prompt user is played, the step fifteen is carried out, and if the soft switch system finds the corresponding talkback group, the step four is carried out;
step four, the talkback application server waits for the key pressing of the telephone user, the step five is switched to when the talkback application server receives the key pressing of the ' x ' number of the user, and the step nine is switched to when the talkback application server receives the key pressing of the ' # number of the telephone user;
step five, the talkback application server receives the telephone media stream, and then the step six is carried out;
step six, the talkback application server multicasts the media stream to the talkback connection server and sends a 'say' command to the talkback connection server, and then the step seven is carried out;
step seven, the interphone connecting server receives the multicast stream and the 'say' command, controls the 'say' button under the interphone button, transmits the voice channel interphone, and goes to step eight;
step eight, the interphone sends the sound with the corresponding frequency, and step fifteen is carried out;
step nine, the talkback application server stops receiving the telephone media stream, and step ten is carried out;
step ten, the talkback application server prepares for multicast reception of the media stream, and sends a 'no-words' command to the talkback connection server, turning to step eleven;
step eleven, the interphone connecting server controls the interphone to release a 'say' button, the interphone starts to receive the sound in the channel and transmits the sound to the interphone connecting server, and step twelve is carried out;
step twelve, the interphone connects the server and converts the analog sound into the media flow to multicast to the application server of talkbacking, turn to step thirteen;
thirteen, the interphone application server receives the multicast media stream and sends the multicast media stream to the telephone terminal in a unicast mode, and the step fourteen is carried out;
step fourteen, the telephone plays the sound, go to step fifteen;
step fifteen, the telephone hangs up to quit the talkback channel.
The positive progress effects of the invention are as follows: the invention can realize remote talkback and seamless communication, firstly, data transmission is carried out by using a network, and remote voice transmission in different places is realized by using an RTP (real-time transport protocol); secondly, the receiving and releasing control and intercommunication of the interphone system are realized through a local network media stream multicast module; thirdly, replacing part of interphone equipment by using a telephone; and fourthly, configuring different interphone set numbers through a flexible configuration module to realize the intercommunication of one telephone terminal and a plurality of interphone channels.
Drawings
Fig. 1 is a schematic structural diagram of a system for implementing intercommunication between an IP phone and an intercom system by multicast according to the present invention.
FIG. 2 is a flowchart of a method for implementing intercommunication between IP phone and intercom system by multicast according to the present invention.
Detailed Description
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, the system for implementing the intercommunication between the IP phone and the intercom system by multicast according to the present invention includes an intercom application server, an intercom connection server, and an intercom, wherein:
the talkback application server stores the information of the whole system and performs communication service, and is used for supporting the talkback function of one server and a plurality of interphones;
the interphone connecting server is connected with the interphone application server and used for receiving and controlling interphone signals;
the interphone is connected with the interphone connecting server and used for being connected with the common interphone on the interphone connecting server and can be communicated with all the interphones in the same frequency channel.
The talkback application server comprises a configuration management module, a soft switch communication module, a media stream multicast module and a control protocol module, wherein:
the configuration module is connected with the soft switch communication module and used for registering and authenticating a user, opening related configuration permission, configuring soft switch communication service parameters, setting a guide number of an interphone channel, configuring a multicast port and an IP address of an interphone connection server and setting related operation keys;
the soft exchange communication module is connected with the media stream multicast module and is used for communicating with the soft exchange system and the telephone system, receiving a call from the telephone terminal, negotiating a media stream format and a transmitted port address, and realizing signaling and media control connection from the telephone terminal to the talkback application server;
the media stream multicast module is connected with the control protocol module, receives the media stream from the telephone terminal according to the address and the port negotiated by the soft switch communication module, decodes the media stream according to different coding formats, sends the decoded media stream to the interphone connecting server in a multicast mode after the processing is finished, receives the voice stream from the media stream multicast receiving and sending module in the interphone connecting server at the corresponding multicast port, and forwards the voice stream to the telephone terminal through unicast;
the control protocol module is used for communicating with the interphone connecting server, when a telephone user presses the 'star' key, the media stream multicast module processes the voice stream, sends a 'saying' command to the interphone connecting server so as to inform the interphone of pressing the 'saying' button, and when the soft switch communication module receives the 'saying' command when the telephone user presses the '#' key, the soft switch communication module sends a 'not saying' command to the interphone connecting server so as to inform the interphone of releasing the 'saying' button.
The interphone connecting server comprises a media stream multicast transceiving module and a control module, wherein:
the media stream multicast receiving and transmitting module is connected with the control module and used for receiving the multicast media stream from the media stream multicast module in the talkback application server and converting the multicast media stream into a sound signal which can be accepted by the talkback, and simultaneously receiving the sound signal from the talkback and converting the sound signal into a digital media stream for multicast to the media stream multicast module in the talkback application server;
and the control module is used for receiving a control signaling of the control protocol module in the talkback application service, controlling the interphone to press the speaking button when receiving a speaking command, and controlling the interphone to release the speaking button when receiving a non-speaking command.
As shown in fig. 2, the method for implementing the intercommunication between the IP phone and the intercom system by multicast according to the present invention includes the following steps:
step one, dialing a corresponding interphone channel guide number, and turning to step two;
step two, establishing connection between the telephone terminal and the soft switch system through an H323 (audio and video transmission protocol) and an SIP (session initiation protocol) communication protocol, and turning to step three;
step three, the soft switch system communicates with an talkback application server through a TAPI (abbreviation of telephone application programming interface), JTAPI (technical application programming interface) protocol, the introduction number is transmitted into the talkback application server in a CTI (computer telephony integration) parameter mode, the talkback application server searches a talkback group configured in the system according to the transmitted number, and if the introduction number cannot be found, a voice is played to prompt a user, and the step fifteen is carried out; if the corresponding talkback group is found, establishing a media stream channel and a DTMF (multi-tone dual-frequency) key interaction channel with the telephone terminal, and turning to the step four;
step four, the talkback application server starts to wait for receiving a key instruction of the telephone user, indicates that the telephone user needs to speak when the talkback application server receives the key of the ' x ' number pressed by the user, and then turns to step five, indicates that the telephone user does not need to speak when the talkback application server receives the key of the ' # number pressed by the telephone user, and then turns to step nine;
step five, the talkback application server sends the data of the RTP (real-time transport protocol) protocol and the signal control protocol to the talkback connection server in a multicast mode, and the step six is carried out;
step six, the interphone connecting server transmits the sound to the interphone connected with the interphone connecting server by processing the RTP voice stream, and simultaneously presses the button of the interphone's speaking' to send the sound to all interphones in the interphone channel by the control protocol, and the step seven is turned to;
step seven, the interphone connecting server starts to receive the multicast media stream from the talkback application server and simultaneously receives a 'speak' command, so that the interphone connecting server controls the interphone to press a 'speak' button to prepare speaking, then the interphone connecting server converts the received voice media stream into analog sound to be transmitted to the interphone, and step eight is converted;
step eight, the interphone sends the received sound to all interphones in the intercommunication channel, and step fifteen is carried out;
step nine, the talkback application server stops receiving the telephone media stream, and step ten is carried out;
step ten, the talkback application server opens a corresponding multicast receiving port to prepare for receiving the media stream from the talkback connection server, and simultaneously sends a 'no-words' control command to the talkback connection server, turning to step eleven;
step eleven, the interphone connecting server controls the interphone to release a 'say' button, the interphone starts to receive the sound in the channel and transmits the sound to the interphone connecting server, and step twelve is carried out;
step twelve, after receiving the analog signal transmitted by the interphone, the interphone connecting server performs digital conversion and sends the analog signal to the talkback application server in a multicast mode, and then the step thirteen is performed;
thirteen, the interphone application server receives the multicast media stream and sends the multicast media stream to the telephone terminal in a unicast mode, and the step fourteen is carried out;
step fourteen, the telephone terminal receives the media stream, broadcasts the sound, and goes to step fifteen;
step fifteen, the telephone hangs up to quit the talkback channel.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A system for realizing intercommunication between IP telephone and interphone system by multicast is characterized in that it includes:
the talkback application server is used for storing the information of the whole system and carrying out communication service and is used for supporting the talkback function of one talkback application server and a plurality of interphones;
the interphone connecting server is connected with the interphone application server and used for receiving and controlling interphone signals;
the interphone is connected with the interphone connecting server; the interphone is connected to the interphone connecting server and can communicate with all interphones in the same frequency channel;
the intercom application server includes:
a configuration module connected with the soft switch communication module and used for registering and authenticating the user and opening the related configuration authority,
configuring soft switch communication service parameters, setting a guide number of an interphone channel, configuring a multicast port and an IP address of an interphone connection server, and setting keys for related operations;
the soft exchange communication module is connected with the media stream multicast module and is used for communicating with the soft exchange system and the telephone system, receiving a call from the telephone terminal, negotiating a media stream format and a transmitted port address, and realizing signaling and media control connection from the telephone terminal to the talkback application server;
a media stream multicast module connected with the control protocol module and used for negotiating the address and the port according to the soft switch communication module
The method comprises the steps that media streams from a telephone terminal are received, decoding is carried out according to different coding formats, the processed media streams are sent to an interphone connecting server in a multicast mode, voice streams from a media stream multicast receiving and sending module in the interphone connecting server are received at corresponding multicast ports, and then the voice streams are forwarded to the telephone terminal through unicast;
the control protocol module is used for communicating with the interphone connecting server, when a telephone user presses a 'star' key, the media stream multicast module processes the voice stream, sends a 'saying' command to the interphone connecting server so as to inform the interphone of pressing a 'saying' button, and when the soft switch communication module receives the 'saying' command which is sent to the interphone connecting server when the telephone user presses a '#' key, so as to inform the interphone of releasing the 'saying' button;
the interphone connection server includes:
the media stream multicast receiving and transmitting module is connected with the control module and used for receiving the multicast media stream from the media stream multicast module in the talkback application server and converting the multicast media stream into a sound signal which can be accepted by the talkback, and simultaneously receiving the sound signal from the talkback and converting the sound signal into a digital media stream for multicast to the media stream multicast module in the talkback application server;
and the control module is used for receiving a control signaling of the control protocol module in the talkback application service.
2. A method for interworking IP telephony with intercom systems by multicast, using the system of claim 1, characterized in that it comprises the following steps:
step one, the user picks up the phone and dials, transfer to step two;
step two, the telephone terminal connects the soft switching system, change step three;
step three, the soft switching system communicates with the talkback application server, and if the soft switching system can not find the corresponding talkback group, the voice is played
Prompting the user, turning to the step fifteen, and turning to the step four if the user is found;
step four, the talkback application server waits for the key pressing of the telephone user, and the talkback application server receives the key pressing of the star number key of the user
If yes, switching to the step five, and switching to the step nine when the talkback application server receives that the telephone user presses a # key;
step five, the talkback application server receives the telephone media stream, and then the step six is carried out;
step six, the talkback application server multicasts the media stream to the talkback connection server and sends a 'say' command to the talkback
Connecting a server, and turning to the seventh step;
step seven, the interphone connecting server receives the multicast stream and the 'say' command, controls the 'say' button of the interphone key,
transmitting the sound to the interphone, and turning to the step eight;
step eight, the interphone sends the sound with the corresponding frequency, and step fifteen is carried out;
step nine, the talkback application server stops receiving the telephone media stream, and step ten is carried out;
step ten, the talkback application server prepares for multicast reception of the media stream, and sends a 'no-words' command to the talkback connection server, turning to step eleven;
step eleven, the interphone connecting server controls the interphone to release a 'say' button, the interphone starts to receive the sound in the channel and transmits the sound to the interphone connecting server, and step twelve is carried out;
step twelve, the interphone connects the server and converts the analog sound into the media flow to multicast to the application server of talkbacking, turn to step thirteen;
thirteen, the interphone application server receives the multicast media stream and sends the multicast media stream to the telephone terminal in a unicast mode, and the step fourteen is carried out;
step fourteen, the telephone plays the sound, go to step fifteen;
step fifteen, the telephone hangs up to quit the talkback channel.
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| CN201611260316.XA CN108270729B (en) | 2016-12-30 | 2016-12-30 | System and method for realizing intercommunication between IP telephone and interphone system through multicast |
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| CN201611260316.XA CN108270729B (en) | 2016-12-30 | 2016-12-30 | System and method for realizing intercommunication between IP telephone and interphone system through multicast |
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| CN108270729B true CN108270729B (en) | 2020-08-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002310675A (en) * | 2001-04-15 | 2002-10-23 | Yukio Shimada | Direct navigation system |
| CN1809103A (en) * | 2006-01-27 | 2006-07-26 | 易凯 | Real-time mobile interphone short message system and method of providing service to users with the system |
| CN104427290A (en) * | 2013-09-11 | 2015-03-18 | 航天信息股份有限公司 | Processing method and processing system for audio/video data |
| CN104601739A (en) * | 2014-12-15 | 2015-05-06 | 厦门联掌网络有限公司 | Method for performing multi-IP (internet protocol) wireless data interaction between intercom system and hand-held equipment |
| CN105245537A (en) * | 2015-10-26 | 2016-01-13 | 上海华讯网络系统有限公司 | Method and system for connecting telephone system with broadcast system via switching value control |
-
2016
- 2016-12-30 CN CN201611260316.XA patent/CN108270729B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002310675A (en) * | 2001-04-15 | 2002-10-23 | Yukio Shimada | Direct navigation system |
| CN1809103A (en) * | 2006-01-27 | 2006-07-26 | 易凯 | Real-time mobile interphone short message system and method of providing service to users with the system |
| CN104427290A (en) * | 2013-09-11 | 2015-03-18 | 航天信息股份有限公司 | Processing method and processing system for audio/video data |
| CN104601739A (en) * | 2014-12-15 | 2015-05-06 | 厦门联掌网络有限公司 | Method for performing multi-IP (internet protocol) wireless data interaction between intercom system and hand-held equipment |
| CN105245537A (en) * | 2015-10-26 | 2016-01-13 | 上海华讯网络系统有限公司 | Method and system for connecting telephone system with broadcast system via switching value control |
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