[Packet.Guide.to.Voice.over.IP(2013.2)].Bruce.Hartpence.文字版

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1、PacketGuidetoVoiceoverIPBruceHartpencePacketGuidetoVoiceoverIPbyBruceHartpenceCopyright©2013BruceHartpence.Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebastopol,CA95472.O’Reillybooksmaybepurchasedforeducational,business,orsalespromo

2、tionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:800-998-9938orcorporate@oreilly.com.Editors:AndyOramandMariaGulickCoverDesigner:KarenMontgomeryProductionEditor:RachelSteelyInteriorDesigner:Dav

3、idFutatoCopyeditor:AmnetIllustrator:RebeccaDemarestProofreader:AmnetFebruary2013:FirstEditionRevisionHistoryfortheFirstEdition:2013-02-21:FirstreleaseSeehttp://oreilly.com/catalog/errata.csp?isbn=9781449339678forreleasedetails.NutshellHandbook,theNutshellHandbooklogo,andtheO’Reillylogoareregistered

4、trademarksofO’ReillyMedia,Inc.PacketGuidetoVoiceoverIP,theimageofagreenwoodpecker,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellerstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.,wasa

5、wareofatrade‐markclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenoresponsibilityforerrorsoromissions,orfordamagesresultingfromtheuseoftheinformationcontainedherein.ISBN:978-1-449-33967-8[LSI]TableofConten

6、tsPreface.......................................................................ix1.IntroductiontoVoiceovertheInternetProtocol..................................1WhatIsVoIP?2Real-timeVersusNonreal-timeData5WhyChangetoVoIP?7TheBusinessCase8VoIPandFCCRegulation991110ANoteonPower11GeneralVoIPTopologies

7、11PoweroverEthernet15PoEBasicOperation16VoIPProtocols17SignalingProtocols18TransportProtocol20VoIPBasicOperation21Performance29UnifiedCommunications30Summary31StandardsandReading31ReviewQuestions32ReviewQue