Method and system for transmitting voices based on TCP in VoIP

Abstract

The invention provides a method and a system for transmitting voices based on the TCP in the VoIP, wherein an SIP terminal sends and receives data by means of a middleware unit. The data sending process comprises the steps of encoding a self-recognition boundary of data by the middleware unit, and sending the encoded data to an opposite-site SIP terminal through the TCP transmission. The data receiving process comprises the steps of decoding the self-recognition boundary of data received through the TCP transmission by the middleware unit, and sending the decoded data to the SIP terminal. According to the technical scheme of the invention, the TCP protocol stack is optimized, and the real-time transmission effect of voice data is improved. Meanwhile, the voice transmission is conducted based on the optimized TCP protocol to traverse a firewall. During the transmission process of voice data, the middleware unit is adopted cooperatively. Therefore, the self-recognition of the TCP data boundary is realized. The transmission effect of voice data is further improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and system for transmitting voice based on TCP in VoIP. Background technique [0002] Network Address Translation / Firewall Traversal (NAT / FT, Network Address Translation / Firewall Traversal) is a technology that ensures normal communication between a host behind a NAT device and an external host. [0003] Due to the shortage of IPv4 addresses and network security issues, most enterprise users set up NAT / NAPT devices at the network egress to establish a private IP Network address and port to communicate with external hosts. Session Initiation Protocol (SIP, SessionInitiationProtocol) is a text-based application layer protocol. The IP address information related to session establishment is transmitted in the data packet, but NAT processes the protocol layer below TCP / IP and cannot parse the SIP data of the application layer. packet, unable to complete the normal SIP...

AI Technical Summary

Problems solved by technology

[0010] However, the disadvantage of this method is: the typical application of this solution is to put a proxy behind the firewall, and the proxy needs to be assigned a public IP address

[0014] In the actual network scenario that generally includes NAT, firewalls always appear together. In this case, none of the aforementioned technologies can effectively traverse both NAT and firewalls while taking into account the efficiency. On the premise of considering the traversal efficiency, The network environment targeted by each existing technology is relatively single, and cannot solve the problem of NAT and firewall traversal in the most common network environment in VoIP

Images