CN110809128B - Method for viewing terminal video based on SIP video call - Google Patents
Method for viewing terminal video based on SIP video call Download PDFInfo
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- CN110809128B CN110809128B CN202010013357.9A CN202010013357A CN110809128B CN 110809128 B CN110809128 B CN 110809128B CN 202010013357 A CN202010013357 A CN 202010013357A CN 110809128 B CN110809128 B CN 110809128B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
- H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
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Abstract
The invention discloses a method for checking terminal video based on SIP video call, wherein a video call system adopts a C/S architecture model, and when an IP extension terminal initiates a video call, an SIP protocol stack module realizes the establishment of an early unidirectional audio/video media stream session with an IP audio/video dispatching station terminal by sending an INVITE message and processing a PRACK message. The IP extension terminal displays the video image through the audio and video playing and displaying module according to the SDP information, and the IP audio and video dispatching station end can check the extension video in advance. The invention is beneficial to the IP audio and video dispatching desk to carry out accurate dispatching, and before the two-way call between the two parties is established no matter the dispatching desk is a calling party or a called party, the video code stream of the incoming call terminal is directionally acquired at the IP audio and video dispatching desk end, so that the video image of the incoming call terminal can be checked in advance, the IP audio and video dispatching desk can be conveniently connected with a call line preferentially according to the number and the important level of the incoming calls, and the accurate dispatching can be realized.
Description
Technical Field
The invention relates to the field of multimedia communication scheduling, in particular to a method for viewing terminal videos based on SIP video calls.
Background
Video calling is a conversation mode which can realize voice and video communication with multiple people simultaneously. Through the video call, the face-to-face speech of users in a plurality of different places can be realized, the video images of the opposite side can be checked, the voice and video image information can be rapidly transmitted to the opposite side, and the communication efficiency is improved. Due to the inherent advantages of video calls, the technology is widely applied to various fields, and the requirements of various industries on the audio and video communication quality and the communication effect are more and more strict.
SIP (Session Initiation Protocol) is a multimedia communication Protocol, can be well supported and applied to multimedia communication sessions such as voice, video, data, etc., and is used for creating, modifying and terminating sessions between two parties or among multiple parties.
Within the dispatch communications industry, video calls based on the SIP protocol have found good application. The IP audio and video dispatching desk used for commanding and dispatching frequently initiates a video call to the IP extension terminal or connects the call from the IP extension terminal, and after the video call is successfully established, the IP audio and video dispatching desk and the IP extension terminal can mutually check the video image of the other side. However, before the video call is established, the problem that the video images of the IP extension terminal cannot be checked in advance exists, and the accurate command scheduling is not facilitated to be carried out. For example, when a plurality of IP extension terminals dial an IP audio/video dispatching station at the same time, and when the IP audio/video dispatching station does not connect a video, the video images of the IP extension terminals cannot be checked in advance, and the video call cannot be connected in a good priority order. For example, when the IP audio/video dispatching desk plays the IP extension terminal, if the IP extension terminal is not connected, the IP audio/video dispatching desk cannot check the video image of the IP extension terminal, and cannot check the scene information around the IP extension terminal. These problems will affect the communication scheduling and are not conducive to safe production.
Disclosure of Invention
The invention aims to provide a method and a system for checking terminal videos based on SIP video calls, which are used for checking video images of IP extension terminals in advance and carrying out accurate command scheduling before video calls are established. When a plurality of IP extension terminals dial the IP audio/video dispatching desk simultaneously, the video call can be connected preferentially according to the importance level, so that the dispatching desk and the IP extension terminals can check the video images of the IP extension terminals in advance when the telephone channel is not connected, and the information of the surrounding scenes of the IP extension terminals can be checked, thereby improving the communication dispatching efficiency and the safety.
In order to achieve the purpose, the invention provides the following technical scheme: a method for checking terminal video based on SIP video call, the video call system adopts C/S architecture model, the main function module includes IP audio-video dispatching desk, multimedia communication platform and IP extension terminal, the IP audio-video dispatching desk and IP extension terminal are integrated with SIP protocol stack module, audio-video collection module, audio-video transmission processing module and audio-video playing and rendering module; when an IP extension terminal initiates a video call, an SIP protocol stack module realizes the establishment of an early unidirectional audio/video media stream session with an IP audio/video dispatching station terminal by sending an INVITE message and processing a PRACK message; the IP extension terminal initializes the information of local video acquisition frame rate, code rate and video resolution according to the SDP information, and transmits video images to an IP audio and video dispatching desk through an audio and video transmission processing module, and the IP audio and video dispatching desk displays the video images through an audio and video playing and rendering module after receiving video code streams; meanwhile, by shielding local video images, a video one-way call is established, and the IP audio and video dispatching station can check the extension videos in advance when audio and video calls of both parties are not established formally.
Furthermore, when the IP audio/video dispatching desk is a calling IP extension terminal, the video image of the IP extension terminal can be checked in advance at the IP audio/video dispatching desk.
The invention is beneficial to the IP audio and video dispatching desk to carry out accurate dispatching, and before the IP audio and video dispatching desk is a calling party or a called party, the video code stream of the incoming call terminal is directionally obtained at the dispatching desk end before the two-way call of the two parties is established, so that the video image of the incoming call terminal can be checked in advance, the dispatching desk can conveniently and preferentially connect a call line according to the number and the important level of the incoming calls, and the accurate dispatching can be realized.
Drawings
FIG. 1 is a basic flow chart of the call establishment between an IP audio/video dispatching desk and an IP extension terminal in the invention;
FIG. 2 is a flow chart of dialing an IP audio/video scheduling station by an IP extension terminal according to an embodiment of the present invention;
fig. 3 is a flowchart of dialing an IP extension terminal by an IP audio/video scheduling station according to an embodiment of the present invention.
Detailed Description
Reference will now be made to the drawings in which embodiments of the invention are illustrated. Referring to fig. 1, a method for viewing terminal video based on SIP video call, a video call system adopts a C/S architecture model, main functional modules include an IP audio/video scheduling console, a multimedia communication platform and an IP extension terminal, and an SIP protocol stack module, an audio/video acquisition module, an audio/video transmission processing module and an audio/video playing and rendering module are integrated in the IP audio/video scheduling console and the IP extension terminal; when an IP extension terminal initiates a video call to an IP audio/video dispatching desk, an SIP protocol stack module realizes the establishment of an early unidirectional audio/video media stream session with the IP audio/video dispatching desk by sending an INVITE message and processing a PRACK message; the IP extension terminal initializes the information of local video acquisition frame rate, code rate and video resolution according to the SDP information, and transmits video images to the IP audio and video dispatching desk through the audio and video transmission processing module, the IP audio and video dispatching desk displays the video images through the audio and video playing and rendering module after receiving video code streams, and the IP audio and video dispatching desk can check the videos of the IP extension terminal in advance when a call between two parties is not established; if the IP audio/video dispatching station is the calling IP extension terminal, the video image of the IP extension terminal can be checked in advance at the IP audio/video dispatching station.
In the invention, by optimizing an SIP protocol stack, in the process of carrying out SIP session negotiation and establishing an early unidirectional audio/video media stream, the video image of the IP extension terminal is transmitted to the IP audio/video dispatching desk end, and the video stream of the IP audio/video dispatching desk is shielded, so that the directional transmission of the video code stream is realized, and the video image of the IP extension terminal can be checked in advance at the IP audio/video dispatching desk end; according to the video image, a dispatcher of the IP audio and video dispatching desk can conveniently check the incoming call of whom the call is, and if a plurality of calls are simultaneously incoming, the incoming call can be preferentially answered or temporarily not answered according to the incoming call object; when the line is answered and the formal call is established, the two communication parties switch the early media stream session into the normal media stream session by updating the video session, so that the normal audio and video call between the IP audio and video dispatching desk and the IP extension terminal is completed.
In order to realize the establishment of early unidirectional audio/video media session and the directional control transmission of voice and video images of an IP extension terminal, processing needs to be carried out on the basis of SIP call signaling, and after a calling terminal sends Invite signaling and before a called terminal sends 200OK SIP signaling, the IP extension terminal needs to be controlled to send voice or video code streams to a dispatching desk terminal, so that the dispatching desk can check the video images of an incoming IP extension terminal in advance.
The following method provides a solution (as shown in fig. 2) for establishing an early unidirectional audio/video media session and transmitting a video image of an IP extension terminal, when the IP extension terminal dials an IP audio/video dispatching desk, wherein the IP extension terminal is used as a calling terminal, and the IP audio/video dispatching desk is used as a called terminal. After receiving the INVITE message sent by the communication platform, the called terminal negotiates with a locally supported media format according to remote session description information (SDP) carried by the SIP message, and obtains an audio/video code stream format for establishing a session. Then sending sip signaling (183 answer) with session description information (SDP) for the early media session to the multimedia communication platform, and the multimedia communication platform establishes the early media session between the calling party and the called party according to the signaling. In order to realize the viewing of video images at the IP audio/video dispatching desk, a called terminal (the IP audio/video dispatching desk) shields a local video code stream and sends a section of locally played voice code stream as a call ring back tone; and the calling terminal (IP extension terminal) sends the local video code stream. When the early unidirectional audio/video media session is successfully established, the calling terminal can normally hear the call ring back tone, and the called terminal can check the video image of the calling terminal in advance.
In general, after receiving INVITE signaling, the called terminal (IP audio/video dispatcher station) will send 183 RingSIP signaling to notify the calling terminal of normal ringing, and after establishing early media session, send back ringing. In the scheme, a calling terminal (an IP extension terminal) sends a PRACK signaling, a called terminal (an IP audio and video dispatching desk) sends 200OK, and after a multimedia communication platform establishes an early session between the calling terminal and the called terminal, on one hand, the called terminal (the IP audio and video dispatching desk) sends a ringtone back to the calling terminal, and on the other hand, the calling terminal initializes a local video module and pushes a video code stream to the IP audio and video dispatching desk, so that a video image of the calling terminal can be checked in advance at the dispatching desk, and the dispatching is convenient.
The IP audio and video dispatching desk knows who is calling by looking up the video images of the IP extension terminal in advance, thereby deciding which video call is preferentially put through, delaying or rejecting the call of the extension. When the IP audio and video dispatching desk agrees to put through an incoming call, the multimedia communication platform puts through a formal conversation line of a calling party and a called party by sending SIP signaling (200 OK) which responds to formally establish conversation to the multimedia communication platform, and switches the early media conversation to a normal conversation, thereby realizing the normal bidirectional audio and video conversation between the IP audio and video dispatching desk and an IP extension terminal.
For an IP audio and video dispatching desk dialing an IP extension terminal (as shown in figure 3), when an early media session is successfully established, the IP extension terminal can send a section of locally played voice code stream as a call ring back tone and send a local video code stream to the IP audio and video dispatching desk, and the IP audio and video dispatching desk terminal shields the local audio and video code stream, so that the IP audio and video dispatching desk terminal can also check video images of the IP extension terminal under the condition that the IP extension terminal is not off-hook, directional transmission of voice and video streams is realized, and accurate dispatching is facilitated. In some special industries or emergency command and dispatch industries, when an emergency situation occurs on the site of an IP extension terminal, the function can quickly know the on-site emergency state, and is convenient for guiding safety rescue or other logistics support work to be arranged in advance.
When the IP extension terminal agrees to put through an incoming call, the communication platform puts through a formal conversation line of a calling party and a called party by sending an SIP signaling (200 OK) which responds to formally establish a conversation to the communication platform, and quickly switches an early media conversation to a normal conversation to realize normal two-way audio and video conversation between a dispatching desk and the IP extension terminal.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (1)
1. A method for checking terminal video based on SIP video call is characterized in that a video call system adopts a C/S architecture model, main functional modules comprise an IP audio and video dispatching desk, a multimedia communication platform and an IP extension terminal, and an SIP protocol stack module, an audio and video acquisition module, an audio and video transmission processing module and an audio and video playing and rendering module are integrated in the IP audio and video dispatching desk and the IP extension terminal; when an IP audio and video dispatching desk calls an IP extension terminal, transmitting a video image of the IP extension terminal to an IP audio and video dispatching desk end by optimizing an SIP protocol stack in SIP session negotiation and establishing an early unidirectional audio and video media stream, shielding the video stream of the IP audio and video dispatching desk, and realizing directional transmission of a video code stream, so that the video image of the IP extension terminal can be checked in advance at the IP audio and video dispatching desk end; when the IP audio/video dispatching desk is used as a called party, namely an IP extension terminal calls the IP audio/video dispatching desk, the SIP protocol stack module realizes the establishment of an early unidirectional audio/video media stream session with the IP audio/video dispatching desk end by sending an INVITE message and processing a PRACK message; the IP extension terminal initializes the information of local video acquisition frame rate, code rate and video resolution according to the SDP information, and transmits video images to an IP audio and video dispatching desk through an audio and video transmission processing module, and the IP audio and video dispatching desk displays the video images through an audio and video playing and rendering module after receiving video code streams; meanwhile, a video one-way call is established by shielding local video images, so that the IP audio and video dispatching station can check extension videos in advance when audio and video calls of both parties are not established formally; therefore, no matter the IP audio and video dispatching desk is used as a calling party or a called party, the video images of the IP extension can be checked in advance, and the IP audio and video dispatching desk is favorable for realizing accurate dispatching.
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| CN202010013357.9A CN110809128B (en) | 2020-01-07 | 2020-01-07 | Method for viewing terminal video based on SIP video call |
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| CN112887650B (en) * | 2021-01-26 | 2022-06-28 | 北京新方通信技术有限公司 | Audio and video distribution method and system for video call center |
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