Fast private network traversal method based on ICE (Information and Content Exchange) protocol in VoIP (Voice over Internet Protocol)

Abstract

The invention provides a fast private network traversal method based on an ICE (Information and Content Exchange) protocol in a VoIP (Voice over Internet Protocol), belonging to the technical field of communications. The method comprises the following steps of: firstly detecting the type of NAT (Network Address Translation), thereby obtaining a detection result showing a symmetrical NAT environment or an asymmetrical NAT environment; only checking the connectivity of a host candidate address and a relay candidate address in the symmetrical NAT environment,; and only checking the connectivity of the host candidate address and a server return candidate address in the asymmetrical NAT environment. According to the method provided in the invention, the expenditure is reduced, and time relay in successful establishment of media connection is shortened, wherein the time delay is a very important voice quality measurement parameter for voice services; and simultaneously, the connectivity check in the method provided in the invention guarantees the efficient transmission of voices in a same private network environment.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a fast private network traversal method based on ICE protocol in VoIP. Background technique [0002] VoIP is the abbreviation of Voice over Internet Protocol (generally called IP phone in the industry), which converts voice or fax into data, and then shares the same IP network (Internet Internet) with data. For the VoIP service, the schematic diagram of its system architecture is as follows: figure 1 shown. NAT (Network Address Translation) is accompanied by the exhaustion of ipv4 addresses and the increasing number of hosts joining the Internet. Between the private network and the external network, NAT is responsible for converting the ip address. Private network traversal and NAT traversal refer to the same technology, but the names are different. [0003] With the maturity and wide application of VoIP technology, more and more enterprises and individuals h...

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of this solution is: when upgrading, the NAT device needs to be upgraded, which will be a very difficult task for the current network we are in, and it is difficult to achieve in practice. Another ALG method The disadvantage is that ALG must have a thorough understanding of the application protocol. It is necessary to coordinate the address translation process of NAT according to the protocol process and modify the relevant fields in the data packet load synchronously. This will increase the burden on the gateway. For NAPT, the situation is more complicated and the processing overhead If it is too large, it may affect the normal operation of the network and form a network bottleneck

[0013] The disadvantage of this solution is that, like the ALG solution, the implementation of the MIDCOM solution also requires the support of the gateway. In addition, the implementation of the MIDCOM technology requires the upgrade and expansion of the MIDCOM protocol on the server, so the implementation of the solution will also encounter large investment. , long implementation cycle and other issues

[0017] The disadvantage of this solution is: it does not support the traversal of the symmetric NAT environment, and it is necessary to set up a STUN server on the public network and the terminal must also support the STUN protocol.

[0021] The disadvantage of this solution is that, like the STUN solution, the TURN solution also needs to set up a TURN server on the public network, and the client must also support the TURN protocol

[0028] The disadvantage of this solution is: since the proxy device is the necessary place for all information, it needs to analyze and process the data packets in a centralized manner, so the requirements for the device are very high, and the FULL PXOXY method will increase the packet delay and packet loss Possibility, may cause network bottlenecks, and there may be a single point of failure

However, as mentioned above, the completeness of the ICE scheme directly reduces the traversal speed, making the traversal efficiency very low

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