Method for front recording order to penetrate NAT based on video monitoring

Abstract

The invention belongs to the technical field of network communication, and in particular relates to a video monitoring-based front-end video-on-demand traversal method of NAT. The method realizes the front-end video-on-demand traversing NAT function in the video monitoring service through the media distribution server. The media distribution server allocates different TCP listening ports to the front-end by adding an independent on-demand server module, and tells the front-end through the central management server that the client and the front-end actively connect to establish a TCP connection to transmit RTSP signaling messages. The media distribution server receives the RTSP signaling from the client and forwards it to the front end through necessary simple modifications to complete the establishment of the RTSP signaling; the transmission of the RTP data packet only needs the client to actively and regularly send detection packets to the media distribution server. The invention is simple, convenient and feasible to realize. The client can easily traverse NAT without changing the original video-on-demand process, and the server does not need to allocate any resources before the client establishes the RTSP process, which is efficient and easy to expand.

Description

technical field [0001] The invention belongs to the technical field of network communication, and in particular relates to a video monitoring-based front-end video-on-demand traversal method of NAT. Background technique [0002] With the rapid development of internet, the shortage of IP addresses has become a very prominent problem. Many LANs use private IP internally, and the number and scale of private networks are increasing. At the same time, with the continuous development of technology, network video surveillance based on broadband technology has gradually been popularized and used, and its application fields and application flexibility have far exceeded the scope defined by traditional security monitoring. NAT requires that the connection of the entire service be initiated from the internal network to the external network, and users on the external network cannot directly initiate connection requests to services on the internal network. A large number of client CUs a...

AI Technical Summary

Problems solved by technology

[0007] The problem caused by this is: From the perspective of signaling, users in the external network cannot call users in the internal network; when users in the internal network call users in the external network, they may not receive a response; From the perspective of the media, no matter whether the call is initiated by an intranet or public network user, the media stream of the public network user cannot be correctly routed to the SIP terminal in the intranet.

When the terminals are in the private network, they cannot see each other, the requests and responses sent between the terminals cannot reach the destination correctly, and neither the signaling nor the media can communicate normally.

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