CN116827912A - Call busy tone preemption method and device for video monitoring system - Google Patents
Call busy tone preemption method and device for video monitoring system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 137
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Abstract
The utility model discloses a busy tone preemption method and a device for a call of a video monitoring system, the method comprises the steps of receiving a call request of a new video monitoring call device, judging whether an audio-video call exists currently, if not, establishing the audio-video call with the new video monitoring call device, and ending; if yes, judging whether the received new call request needs to be added into a waiting call list; if the waiting call list is empty, the main control station enters an idle state and ends after the current audio/video call is ended; if the waiting call list is not empty, switching to the video monitoring call equipment in the waiting call list to establish the audio-video call after the audio-video call existing currently is ended. The utility model satisfies the unified maintenance of the multi-video monitoring system, has less consumption of system resources and has little influence on the use of users.
Description
Technical Field
The utility model belongs to the technical field of video monitoring, and particularly relates to a method and a device for preempting a call busy tone of a video monitoring system.
Background
In recent years, video is taken as a basis and important visual perception data of the Internet of things, and plays an important positive role in the aspects of maintaining social security, scene supervision in key industries, intelligent city management and the like. The video monitoring system is used as a core of data management of the video monitoring platform, and the video monitoring system is approved by all parties.
Although the traditional video monitoring system can enable a manager to monitor a plurality of video acquisition points through a plurality of cameras, due to the characteristics of the video monitoring system, the video monitoring system cannot support multi-person voice calls at the same time like a video conference system, and if a group of video calls exist in the system, a newly added video call link cannot be established at the moment. In addition, in the conventional video monitoring system, an existing video call group may block a video call with a higher priority, so that an urgent video call cannot be processed preferentially.
The prior art is as in the Chinese patent document with the application number of CN2020211204412, which discloses a security control video monitoring system, comprising a monitoring center, a central machine room, a plurality of monitoring points and a display terminal, wherein all the monitoring points are provided with monitoring cameras and are connected with the central machine room through optical fiber lines; the monitoring point is provided with a plurality of security control points, the security control points are provided with an instant communication device besides a monitoring camera, and the instant communication device is connected into a central machine room through an optical fiber line and used for communicating with monitoring center personnel in real time. The utility model sets the security control point position with the instant communication device aiming at the key security control area, and provides necessary hardware support for realizing the functions of ensuring video monitoring and real-time security control while ensuring the security control through the intercom module, the fingerprint acquisition module, the portrait acquisition module and the like which are arranged by the instant communication device. But the scheme correspondingly processes video information of a plurality of monitoring points by arranging a plurality of monitoring centers.
In summary, the conventional video monitoring system currently has two defects: 1. the traditional video monitoring system cannot support multi-user voice call at the same time, and if a group of video call exists in the system, and other video monitoring call devices call the main control station, a newly added video call link cannot be established at the moment. 2. Aiming at the session request which needs to be optimally processed in the emergency, the existing video call group in the system can block the call with higher priority, so that the problem that the emergency call cannot be processed preferentially is solved.
Disclosure of Invention
The utility model aims to provide a busy call preemption method of a video monitoring system, which meets the unified maintenance of a plurality of video monitoring systems, has less consumption of system resources and has little influence on the use of users.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the method for preempting the call busy tone of the video monitoring system comprises a main control station and a plurality of video monitoring call devices which are in communication connection with the main control station, wherein the method for preempting the call busy tone of the video monitoring system is implemented on the main control station and comprises the following steps:
step 1, receiving a call request of a new video monitoring call device, judging whether an audio-video call exists currently, if not, establishing the audio-video call with the new video monitoring call device, and ending; if yes, executing the step 2;
step 2, judging whether the received new call request needs to be added into a waiting call list, including:
judging the validity of the new call request, if the new call request is invalid, rejecting the call request, and executing the step 3;
if the new call request is effective, judging whether the new call request meets the call preemption condition, if so, ending the current audio-video call, switching to establish the audio-video call with the new video monitoring call equipment, and executing the step 3;
if not, judging whether the waiting call list is full, if so, rejecting a new call request, and executing the step 3; if not, adding a new call request into the waiting call list, replying busy tone to the new video monitoring call equipment, and executing the step 3;
step 3, if the waiting call list is empty, the main control station enters an idle state and ends after the current audio/video call is ended; if the waiting call list is not empty, switching to the video call monitoring equipment in the waiting call list to establish the video call after the current existing video call is ended, and repeating the step 3.
The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.
Preferably, the determining the validity of the new call request includes:
analyzing a new call request, judging whether the call request carries face information or not, and judging that the call request is invalid if the call request does not carry the face information;
if the face information is carried, the incoming time of the call request is obtained according to the current time and the time of receiving the call request, whether the incoming time of the call request is larger than a time threshold value is judged, if so, a new call request is judged to be effective, and if not, the new call request is judged to be ineffective.
Preferably, the determining whether the new call request meets the call preemption condition includes:
analyzing a new call request, judging whether the call request is an emergency call request or not according to the priority level carried in the call request, and if the call request is the emergency call request, meeting call preemption conditions; otherwise, the call preemption condition is not satisfied.
Preferably, the priority level is two-level and is used for representing the normal level and the emergency level respectively, and when the priority level is the normal level, the call request is judged to be a non-emergency call request, and when the priority level is the emergency level, the call request is judged to be an emergency call request.
Preferably, the priority level is a plurality of levels representing different emergency degrees, and when the level of the priority level of the new call request is greater than the level of the priority level of the existing audio-video call, the new call request is judged to be an emergency call request; otherwise the new call request is a non-emergency call request.
Preferably, the determining whether the waiting call list is full includes:
counting the total number of video monitoring call devices currently accessed by a main control station, wherein the currently accessed video monitoring call devices comprise video monitoring call devices which are in audio and video communication with the main control station and video monitoring call devices which receive busy tone replies of the main control station;
and judging whether the total number of the video monitoring calling devices which are currently accessed is smaller than a calling threshold value, if so, waiting for the call list to be not full, otherwise, waiting for the call list to be full.
Preferably, the method for preempting busy call tone of the video monitoring system further includes periodically updating the waiting call list, specifically:
and before the video call existing at present is ended, circularly judging whether the busy tone audio data corresponding to the call request in the waiting call list is transmitted completely, rejecting the call request if the busy tone audio data is transmitted completely, and moving the call request out of the waiting call list.
Preferably, the switching to establish an audio-video call with the video monitoring call device in the waiting call list includes:
and switching to one video monitoring call device with the highest priority level or the earliest time for receiving the call request to establish audio and video call according to the priority level of each call request or the time sequence for receiving each call request in the waiting call list.
Preferably, the switching to the video monitoring call device with the highest priority level or the earliest time for receiving the call request establishes the audio-video call, including:
and the main control station switches the source of the audio source data sent to the video monitoring call equipment from preset busy tone audio source data to audio data collected by the microphone.
When a group of audio and video calls exist in a main control station, after other video monitoring call devices call the main control station, the main control station judges that the video monitoring call devices are in a busy state and replies a section of busy audio data of the video monitoring call devices. If the main control station finishes and ends the last audio-video call during the busy tone audio data recovery, the busy tone audio data recovery is immediately ended at the moment, and the main control station and the video monitoring call equipment perform normal call. And in the process of ending the reply busy tone and recovering the normal call, the same communication link is always adopted between the main control station and the video monitoring call equipment, so that no extra link switch is consumed, and no extra application time is consumed. The whole flow realizes seamless switching, has little influence on the use of users, and has no extra system resource consumption. In addition, when a group of video calls already exist in the main control station, after other video monitoring call devices call the main control station, the main control station judges that the call device is at a higher priority, and the main control station can actively close the last audio/video call and start the audio/video call with the video monitoring call device with the higher priority.
The second object of the present utility model is to provide a device for preempting busy call in a video monitoring system, which comprises a processor and a memory storing a plurality of computer instructions, wherein the computer instructions implement the steps of the preempting busy call method in any one of the video monitoring systems when executed by the processor.
Drawings
FIG. 1 is a schematic diagram of a video surveillance system according to the present utility model;
fig. 2 is a flow chart of a call busy preemption method of the video monitoring system of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Aiming at the defects of the existing video monitoring system, the embodiment provides a busy call preemption method of the video monitoring system. As shown in fig. 1, the video monitoring system according to this embodiment includes a main control station and a plurality of video monitoring call devices communicatively connected to the main control station. The main control platform is responsible for video monitoring, voice communication and video data processing, and can be a software module with corresponding processing functions and capable of being loaded into a video monitoring system, or can be hardware equipment with corresponding processing functions, such as computer equipment, a processing chip and the like, which is arranged in the video monitoring system and preloaded; the video monitoring calling equipment is video monitoring equipment with a voice call function.
In the video monitoring system, a main control station monitors data collected by all video monitoring call equipment in real time through RTSP/RTMP/HTTP-FLV and other protocols, and meanwhile, when a call is required, the video monitoring call equipment actively calls the main control station. If the system is in an idle state, the video monitoring calling device can normally communicate with the main control station. If a group of audio and video calls exist in the system, and other video monitoring calling equipment calls the main control station, the main control station judges that the system is in a busy state, and the main control station can reply busy tone audio data of the calling equipment or generate call preemption according to the priority of the calling equipment.
As shown in fig. 2, the method for preempting the busy call of the video monitoring system of the present embodiment is implemented in a main control station, and specifically includes the following steps:
step 1, receiving a call request of a new video monitoring call device, judging whether an audio-video call exists currently, if the audio-video call does not exist, establishing the audio-video call with the new video monitoring call device, acquiring and sending audio data acquired by a microphone to the new video monitoring call device by a main control station, and ending the processing of the new call request received at this time; if the audio/video call exists, the video monitoring system is in a busy state currently, and step 2 is executed.
It should be noted that, ending the processing of the new call request received this time is understood to be that the determination execution of the new call request is completed, and it does not represent ending the audio/video call between the console and the new video monitoring call device.
Step 2, judging whether the received new call request needs to be added into a waiting call list, including:
and 2.1, judging the validity of the new call request, if the new call request is invalid, rejecting the call request, and executing the step 3.
In order to avoid the occupation of resources by a call request generated by equipment failure or accidental contact, the embodiment firstly performs validity judgment on a new call request, and provides a validity judgment process as follows:
analyzing the new call request, judging whether the call request carries face information, and if not, judging that the call request is invalid. When the call request does not carry the face information, the video monitoring call equipment does not detect the caller currently, and the call request is considered to be generated by equipment failure, and the main control station directly refuses the call request.
If the face information is carried, the incoming time of the call request is obtained according to the current time and the time of receiving the call request, whether the incoming time of the call request is larger than a time threshold is judged, if so, the new call request is judged to be effective, otherwise, the new call request is judged to be ineffective.
After judging that the human face information is carried, the main control console continues to judge based on a time threshold value, and the time threshold value is set according to the human emergency response time. For example, the time of the emergency response of the human being is 1.05s-1.28s, the time threshold of the preset value is 2s, if the incoming time of the call request is greater than the time threshold, the call request is judged to be an effective call request, otherwise, the call request is considered to be caused by misoperation of related personnel, and the main control console is not replied.
It should be noted that, the call request is a persistence process, so that determining whether the incoming time of the call request is greater than the time threshold is a persistence determination process, and when the incoming time is less than the time threshold and the call request still exists, updating the incoming time is required, and determining the updated incoming time and the time threshold until the incoming time is greater than the time threshold or until the call request does not exist (e.g., the video monitoring call device hangs up, the call request does not exist).
And 2.2, if the new call request is effective, judging whether the new call request meets the call preemption condition, if so, ending the current audio-video call, switching to establish the audio-video call with the new video monitoring call equipment, and executing the step 3.
In order to avoid the situation that emergency call cannot be processed in time, when a group of video calls exist in the video monitoring system, and after other video monitoring call devices call the main control platform, the main control platform judges that the call device is at a higher priority, and the main control platform can actively close the last audio/video call and open the audio/video call with the call device with the higher priority. And the preemption of the audio and video calls is completed, and the audio and video calls with low priority are prevented from blocking the audio and video calls with high priority. Specifically, the call preemption condition process provided in this embodiment is as follows:
analyzing the new call request, judging whether the call request is an emergency call request according to the priority level carried in the call request, and if the call request is the emergency call request, meeting the call preemption condition; otherwise, the call preemption condition is not satisfied.
The priority level setting modes are various, and the priority level setting modes can be used according to actual demands, and the two setting modes are as follows:
first, a simple priority level setting mode: the priority level is two-level and is used for representing the ordinary level and the emergency level respectively, and when the priority level is the ordinary level, the call request is judged to be a non-emergency call request, and when the priority level is the emergency level, the call request is judged to be an emergency call request.
First, a perfect priority level setting mode: the priority level is a plurality of levels representing different emergency degrees (for example, the number is 1 to 10, the higher the number is, the higher the level representing the emergency degree is), and when the level of the priority level of the new call request is greater than the level of the priority level of the audio-video call existing at present, the new call request is judged to be the emergency call request; otherwise the new call request is a non-emergency call request.
Step 2.3, if the call preemption condition is not met, judging whether the waiting call list is full, if the waiting call list is full, rejecting a new call request, and executing the step 3; if the waiting call list is not full, adding a new call request into the waiting call list, replying busy tone to the new video monitoring call equipment, and executing the step 3.
The embodiment provides a waiting call list, which is used for ensuring reasonable use of resources in a video monitoring system. The waiting call list is used for storing call requests, and when judging whether the waiting call list is full, the waiting call list can be judged according to the total number of video monitoring call devices currently accessed by the main control station, or can be judged directly according to the waiting call list.
When judging according to the total number of video monitoring calling devices currently accessed by the main control station, counting the total number of the video monitoring calling devices currently accessed by the main control station, wherein the video monitoring calling devices currently accessed comprise video monitoring calling devices which are in audio and video communication with the main control station, and video monitoring calling devices which receive busy tone replies of the main control station; and judging whether the total number of the video monitoring calling devices which are currently accessed is smaller than a calling threshold value, if so, waiting for the call list to be not full, otherwise, waiting for the call list to be full.
When judging according to the waiting call list, initializing the waiting call list into a one-dimensional list with a fixed size, and judging whether the waiting call list is full according to the first pointer of the one-dimensional list.
In order to avoid excessively long waiting time of the video monitoring call equipment, and to control the utilization of resources of the video monitoring system, the busy tone audio data replied in the embodiment has a fixed duration (for example, 10 s), and all call requests accessed currently are dynamically maintained according to whether the busy tone audio data is replied to be completed or not. I.e. the present embodiment requires dynamic maintenance of the waiting call list.
And before the video call existing at present is ended, circularly judging whether the busy tone audio data corresponding to the call request in the waiting call list is transmitted completely, rejecting the call request if the busy tone audio data is transmitted completely, and moving the call request out of the waiting call list. Therefore, the resources of the video monitoring system can be saved, and the calling time of the video monitoring calling equipment is saved.
Step 3, if the waiting call list is empty, after the current audio/video call is ended, the main control station enters an idle state, and the busy call preemption method is ended; if the waiting call list is not empty, switching to the video call monitoring equipment in the waiting call list to establish the video call after the current existing video call is ended, and repeating the step 3.
When the master control station is switched to establish audio and video call with the video monitoring call equipment in the waiting call list, switching to one video monitoring call equipment with the highest priority level or the earliest time for receiving the call request to establish audio and video call according to the priority level of each call request or the time sequence for receiving each call request in the waiting call list.
It should be noted that, the priority level or the time sequence of receiving each call request is only two reasonable selection criteria set forth in this embodiment, and in other embodiments, other selection criteria may be set according to actual requirements.
When the master control station switches the video monitoring call equipment from busy tone reply to audio-video call, the master control station switches the source of audio source data sent to the video monitoring call equipment from preset busy tone audio source data to audio data collected by a microphone.
If the master control station finishes and ends the audio-video call with the last video monitoring call device, the master control station immediately stops reading the reserved busy tone audio data in the system and starts to collect and send the audio data in the microphone. The process is characterized in that the audio source data of busy tone is derived from the busy tone file data reserved in the system by changing the source of the audio source data; the audio source data is derived from the audio data of the pick-up microphone for normal voice calls. The switching method realizes seamless switching of busy tone, audio and video call, adopts the same data transmission link, has no extra link switch consumption and no extra application time consumption. The video monitoring system has less resource consumption and less influence on the use of users.
It should be noted that, step 1-3 in the present utility model is an execution judgment process for a new call request, when the main control station currently has an audio/video call and no new call request, the main control station updates the waiting call list in real time and executes step 3 to complete the processing of all the accessed call requests.
The method of the utility model replies busy tone audio data before normal audio-video call, adopts the same transmission link, has no extra link switch consumption, and realizes seamless switching between busy tone and normal call. The system resource consumption is low, and the use effect on users is less. And an audio-video call preemption function is added to the video monitoring system, and the audio-video call with low priority existing in the video monitoring system is actively disconnected aiming at the emergency call master control station, so that the audio-video call with low priority is prevented from blocking the audio-video call with high priority.
The method is verified to be feasible, the video monitoring system has realized the seamless switching function of busy tone and audio/video call, and has the function of preempting the audio/video call with high priority and the audio/video call with low priority. In the audio-video call, the audio data collected by the microphone is sent to the video monitoring call equipment by the main control station, and the audio-video data collected by the video monitoring call equipment is sent to the main control station by the video monitoring call equipment. In other embodiments, the video monitoring system may be provided with a microphone and an image acquisition device on the console side, i.e. the audio data collected by the microphone and the video data collected by the image acquisition device may be sent to the video monitoring call device by the console.
In another embodiment, the utility model also provides a call busy tone preemption device of the video monitoring system, which comprises a processor and a memory storing a plurality of computer instructions, wherein the computer instructions realize the steps of the call busy tone preemption method of the video monitoring system when being executed by the processor.
The specific limitation of the call busy tone preemption device of a video monitoring system can be referred to the limitation of the call busy tone preemption method of a video monitoring system, and is not repeated herein.
The memory and the processor are electrically connected directly or indirectly to each other for data transmission or interaction. For example, the components may be electrically connected to each other by one or more communication buses or signal lines. The memory stores a computer program executable on a processor that implements the method of the embodiments of the present utility model by running the computer program stored in the memory.
The Memory may be, but is not limited to, random access Memory (Random Access Memory, RAM), read Only Memory (ROM), programmable Read Only Memory (Programmable Read-Only Memory, PROM), erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc. The memory is used for storing a program, and the processor executes the program after receiving an execution instruction.
The processor may be an integrated circuit chip having data processing capabilities. The processor may be a general-purpose processor including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), and the like. The methods, steps and logic blocks disclosed in the embodiments of the present utility model may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.
Claims (10)
1. The method for preempting the call busy tone of the video monitoring system is characterized in that the video monitoring system comprises a main control station and a plurality of video monitoring call devices which are in communication connection with the main control station, and the method for preempting the call busy tone of the video monitoring system is implemented on the main control station and comprises the following steps:
step 1, receiving a call request of a new video monitoring call device, judging whether an audio-video call exists currently, if not, establishing the audio-video call with the new video monitoring call device, and ending; if yes, executing the step 2;
step 2, judging whether the received new call request needs to be added into a waiting call list, including:
judging the validity of the new call request, if the new call request is invalid, rejecting the call request, and executing the step 3;
if the new call request is effective, judging whether the new call request meets the call preemption condition, if so, ending the current audio-video call, switching to establish the audio-video call with the new video monitoring call equipment, and executing the step 3;
if not, judging whether the waiting call list is full, if so, rejecting a new call request, and executing the step 3; if not, adding a new call request into the waiting call list, replying busy tone to the new video monitoring call equipment, and executing the step 3;
step 3, if the waiting call list is empty, the main control station enters an idle state and ends after the current audio/video call is ended; if the waiting call list is not empty, switching to the video call monitoring equipment in the waiting call list to establish the video call after the current existing video call is ended, and repeating the step 3.
2. The method for preempting a busy call tone in a video surveillance system of claim 1, wherein said determining the validity of a new call request comprises:
analyzing a new call request, judging whether the call request carries face information or not, and judging that the call request is invalid if the call request does not carry the face information;
if the face information is carried, the incoming time of the call request is obtained according to the current time and the time of receiving the call request, whether the incoming time of the call request is larger than a time threshold value is judged, if so, a new call request is judged to be effective, and if not, the new call request is judged to be ineffective.
3. The method for preempting a busy call tone in a video surveillance system according to claim 1, wherein the determining whether a new call request satisfies a call preemption condition comprises:
analyzing a new call request, judging whether the call request is an emergency call request or not according to the priority level carried in the call request, and if the call request is the emergency call request, meeting call preemption conditions; otherwise, the call preemption condition is not satisfied.
4. The method for preempting busy tone for a video surveillance system as set forth in claim 3, wherein the priority levels are two levels for representing a normal level and an emergency level, respectively, and the call request is determined to be a non-emergency call request when the priority level is the normal level, and the call request is determined to be an emergency call request when the priority level is the emergency level.
5. The method for preempting busy tone for a video surveillance system as set forth in claim 3, wherein the priority levels are a plurality of levels indicating different urgency levels, and when the priority level of the new call request is greater than the priority level of the currently existing audio/video call, determining that the new call request is an urgent call request; otherwise the new call request is a non-emergency call request.
6. The method for preempting busy call in a video surveillance system as set forth in claim 1, wherein said determining whether the waiting call list is full comprises:
counting the total number of video monitoring call devices currently accessed by a main control station, wherein the currently accessed video monitoring call devices comprise video monitoring call devices which are in audio and video communication with the main control station and video monitoring call devices which receive busy tone replies of the main control station;
and judging whether the total number of the video monitoring calling devices which are currently accessed is smaller than a calling threshold value, if so, waiting for the call list to be not full, otherwise, waiting for the call list to be full.
7. The method for preempting the busy call tone of the video monitoring system according to claim 1, wherein the method for preempting the busy call tone of the video monitoring system further comprises periodically updating the waiting call list, specifically:
and before the video call existing at present is ended, circularly judging whether the busy tone audio data corresponding to the call request in the waiting call list is transmitted completely, rejecting the call request if the busy tone audio data is transmitted completely, and moving the call request out of the waiting call list.
8. The method for preempting busy call voice in a video monitoring system according to claim 1, wherein said switching to establish an audio-video call with a video monitoring call device in a waiting call list comprises:
and switching to one video monitoring call device with the highest priority level or the earliest time for receiving the call request to establish audio and video call according to the priority level of each call request or the time sequence for receiving each call request in the waiting call list.
9. The method for preempting busy call in a video monitoring system as in claim 8 wherein said switching to a video monitoring call device with highest priority level or earliest time for receiving a call request establishes an audio-video call, comprising:
and the main control station switches the source of the audio source data sent to the video monitoring call equipment from preset busy tone audio source data to audio data collected by the microphone.
10. A call busy preemption device for a video surveillance system comprising a processor and a memory storing a number of computer instructions, wherein the computer instructions when executed by the processor implement the steps of the call busy preemption method for a video surveillance system as claimed in any one of claims 1 to 9.
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| CN202310660327.0A CN116827912A (en) | 2023-06-05 | 2023-06-05 | Call busy tone preemption method and device for video monitoring system |
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2023
- 2023-06-05 CN CN202310660327.0A patent/CN116827912A/en active Pending
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