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ICE2AS01G 其他数据使用手册 - Infineon（英飞凌）
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ICE2AS01G数据手册
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[MS-ICE2] - v20150904
Interactive Connectivity Establishment (ICE) Extensions 2.0
Copyright © 2015 Microsoft Corporation
Release: September 4, 2015
1 Introduction
This document specifies the Interactive Connectivity Establishment (ICE) Extensions. This protocol
consists of a set of proprietary extensions to the ICE protocol. ICE specifies a protocol for setting up
Real-Time Transport Protocol (RTP) streams in a way that allows the streams to traverse
network address translation (NAT) devices and firewalls.
Signaling protocols, such as Session Initiation Protocol (SIP), are used to set up and negotiate
media sessions. As part of setting up and negotiating the session, signaling protocols carry the IP
addresses and ports of the call participants that receive RTP streams. Because NATs alter IP addresses
and ports, the exchange of local IP addresses and ports might not be sufficient to establish
connectivity. ICE uses protocols such as Simple Traversal of UDP through NAT (STUN) and
Traversal Using Relay NAT (TURN) to establish and verify connectivity.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD,
MUST, MUST NOT, and SHOULD NOT as defined in [RFC2119]. Sections 1.5 and 1.9 are also
normative but do not contain those terms. All other sections and examples in this specification are
informative.
1.1 Glossary
The following terms are specific to this document:
agent: A device that is connected to a computer network. Also referred to as an endpoint.
Aggressive Nomination: The process of selecting a valid candidate pair for media flow by
sending Simple Traversal of UDP through NAT (STUN) binding requests that include the flag
for every STUN binding request such that the first candidate pair that is validated is used for
media flow.
answer: A message that is sent in response to an offer that is received from an offerer.
authentication: The act of proving an identity to a server while providing key material that binds
the identity to subsequent communications.
base: The base of a host candidate is the host candidate itself. The base of server reflexive
candidates and peer reflexive candidates is the host candidate from which they are derived. The
base of a relayed candidate is the relayed candidate itself.
callee: An endpoint to which a call is initiated by a caller.
caller: An endpoint that initiates a call to establish a media session.
candidate: A set of transport addresses that form an atomic unit for use with a media session.
For example, in the case of Real-Time Transport Protocol (RTP) there are two transport
addresses for each candidate, one for RTP and another for the Real-Time Transport Control
Protocol (RTCP). A candidate has properties such as type, priority, foundation, and base.
candidate pair: A set of candidates that is formed from a local candidate and a remote
candidate.
Check List: An ordered list of candidate pairs that determines the order in which connectivity
checks are performed for those candidate pairs.
component: A representation of a constituent transport address if a candidate consists of a set
of transport addresses. For example, media streams that are based on the Real-Time Transfer
Protocol (RTP) have two components, one for RTP and another for the Real-Time Transfer
Control Protocol (RTCP).
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