A kind of voip voice monitoring method and system based on symmetric nat

Abstract

The present invention provides a VoIP voice monitoring method and system based on symmetric NAT. After the VoIP server notifies the STUN / TURN server of the monitored device and the IP address of the monitored device, the STUN / TURN server interacts with the monitored device in message interaction. Reply the public network IP address and port of the monitoring device to the monitored device. After the connectivity check, the monitored device is selected as a relay server, and the voice media stream of the monitored device will pass through the port of the monitored device to obtain the monitored device. The voice call content of the device. The VoIP voice monitoring method and system based on symmetric NAT of the present invention can realize VoIP voice monitoring without changing the signaling flow of the equipment being monitored, and without adding additional devices on the server, and will not be noticed; VoIP voice monitoring The process is executed when the voice is initiated, and the media information will not be changed during the call.

Description

technical field [0001] The present invention relates to the technical field of voice monitoring, in particular to a method and system for voice monitoring of Voice over Internet Protocol (VoIP) based on symmetric Network Address Translation (NAT). Background technique [0002] In the existing Internet network environment, most devices are behind firewalls or NATs. Before performing P2P communication, detection is required to confirm whether P2P communication can be performed between devices and how to communicate. This technique is called NAT traversal (NAT Traversal). The most common NAT traversal is a UDP-based technology, and most VoIP calls use a Session Initiation Protocol (Session Initiation Protocol, SIP) UDP technology. [0003] There are four ways for NAT to treat UDP. When the communication parties are in asymmetric NAT, that is, full cone NAT (Full Cone NAT), restricted cone NAT (Restricted Cone NAT), port restricted cone NAT (Port Restricted Cone NAT) When usi...

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Problems solved by technology

[0009] However, the existing VoIP monitoring method is generally in the core control side, and the monitoring processing device is installed in the core control side. Although it will not increase the complexity of the network, it will increase the load and complexity of the core control side, and will also increase the cost input.

There are also some methods to change the media communication port of the device by sending SIP signaling, and direct the voice media stream to the monitoring device. Although it will not increase the load on the SIP server, it is easy to be noticed when the communication port is suddenly changed during the call; and when When the monitored party is in a symmetric NAT environment, changing the communication port cannot direct the media stream to the monitoring device

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