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Study on NAT Traversal Technologies of SIP Phone

Guo Chao-xin

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Abstract

The large-scale application of SIP(Session Initiation Protocol) phone system meets significant difficulties caused by NAT(Network Address Translators) in IP network.For solving the NAT traversal problem of SIP phone system,the character of full cone NAT,address restricted cone NAT,port restricted cone NAT and symmetric NAT are analyzed,and the advantages and disadvantages of NAT traversal of application level gateway,simple traversal based on UDP,NAT traversal using relay,session border controller and other traversal technologies also compared.With typical SIP phone system as an example and based on its application demand,a NAT traversal scheme is proposed,and its communication procedure also given.This scheme is especially suitable to the application environments with no constraint on network structure,and no reform on network device.

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What this paper is about

The large-scale application of SIP(Session Initiation Protocol) phone system meets significant difficulties caused by NAT(Network Address Translators) in IP network.For solving the NAT traversal problem of SIP phone system,the character of full cone NAT,address restricted cone NAT,port restricted cone NAT and symmetric NAT are analyzed,and the advantages and disadvantages of NAT traversal of application level gateway,simple traversal based on UDP,NAT traversal using relay,session border controller and other traversal technologies also compared.With typical SIP phone system as an example and based on its application demand,a NAT traversal scheme is proposed,and its communication procedure also given.This scheme is especially suitable to the application environments with no constraint on network structure,and no reform on network device.

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Available abstract

The large-scale application of SIP(Session Initiation Protocol) phone system meets significant difficulties caused by NAT(Network Address Translators) in IP network.For solving the NAT traversal problem of SIP phone system,the character of full cone NAT,address restricted cone NAT,port restricted cone NAT and symmetric NAT are analyzed,and the advantages and disadvantages of NAT traversal of application level gateway,simple traversal based on UDP,NAT traversal using relay,session border controller and other traversal technologies also compared.With typical SIP phone system as an example and based on its application demand,a NAT traversal scheme is proposed,and its communication procedure also given.This scheme is especially suitable to the application environments with no constraint on network structure,and no reform on network device.

Key concepts: NAT traversal, Nat, Computer science, Tree traversal, Computer network, Network address, Phone, Network address translation

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