2008•Journal of Chongqing University of Posts and TelecommunicationsRequires access

SIP-based approach to implement P2P NAT traversal

Xiao Ji-min

Abstract

The widely use of NAT devices proposes a challenge to P2P software.Implementing traversal for all kinds of NAT is a key factor of successful P2P application.This paper proposes the methods to implement NAT traversal for both UDP and TCP based on SIP protocol.SIP proxy is temporarily needed before the NAT traversal,and it is no longer needed after connection is established,so it is efficient.Based on various kinds of classification of NAT,the paper introduces a scheme that can realize NAT traversal of UDP by using SIP and the NAT traversal of TCP based on SIP.

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Key concepts: Nat, NAT traversal, Tree traversal, Computer science, Computer network, TCP hole punching, Network address translation, Network address