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Title : Interactive Connectivity Establishment (ICE): A
Methodology for Nettwork Address Translator (NAT)
Traversal for the Session Initiation
Protocol (SIP)
Author(s) : J. Rosenberg
Filename : draft-rosenberg-sipping-ice-00.txt
Pages : 35
Date : 2003-2-26
This document describes a methodology for Network Address Translator
(NAT) traversal for the Session Initiation Protocol (SIP). This
methodology is called Interactive Connectivity Establishment (ICE).
ICE is not a new protocol, but rather makes use of existing
protocols, such as Simple Traversal of UDP Through NAT (STUN),
Traversal Using Relay NAT (TURN) and even Real Specific IP (RSIP).
ICE works through the mutual cooperation of both endpoints in a SIP
dialog. By having the endpoints work together in NAT traversal, a
number of important properties are obtained. ICE always works,
independent of the types or number of NATs. It always represents the
cheapest solution for a carrier. It always results in the minimum
voice latency. It can be done with no increase in call setup delays.
It is far less brittle than STUN. ICE also facilitates the transition
of the Internet from IPv4 to IPv6, supporting calls between
dual-stack and v6 clients behind a 4to6 NAT. Preconditions can be
used in conjunction with ICE, to guarantee that the phone never rings
unless the users will both hear and see each other when they pick up.
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