Cisco press voice over IP first step dec 2005 ISBN 1587201569

VoiceoverIPFirst-Step
ByKevinWallace
...............................................
Publisher:CiscoPress
PubDate:December07,2005
ISBN:1-58720-156-9
Pages:336

TableofContents|Index

YourfirststepintotheworldofIPtelephony
NoIPtelephonyexperiencerequired
Includesclearandeasilyunderstoodexplanations
Makeslearningeasy
YourfirststeptotheworldofIPtelephonybeginshere!
Learnhowvoiceanddatacommunicationsmergeinvoice-over-IPtechnology
Usethisreader-friendlyguidetounderstandthebenefitsofthistechnology
Explorereal-lifeapplicationsandtheoriesthroughcasestudiesineverychapter
WelcometotheworldofvoiceoverIP
Weuseeitheratelephoneore-mailformuchofourday-to-daycommunication.Today,
thesetwoworldsaremerging,andcompaniescanplacephonecallsovertheirexisting
datanetworkinfrastructuresusingatechnologycalledvoiceoverIP(VoIP).

NopriorexperiencewithVoIPtechnologyisrequired
VoiceoverIPFirst-Stepisanyone'sintroductiontotheworldofVoIPnetworks.The
conceptsinthisbookarepresentedinplainlanguage,soyoudon'tneedin-depth
backgroundknowledgetocomprehendthetechnologiescovered.Ifyouworkwithdata
networks,ifyouworkwithtelephonynetworks,ifyou'reahomeuserinterestedinhow
VoIPcanreduceyourmonthlyphonebill,oriftheconceptofVoIPsimplyintriguesyou,
thisbookisforyou.

VoiceoverIPFirst-Step
ByKevinWallace
...............................................
Publisher:CiscoPress
PubDate:December07,2005
ISBN:1-58720-156-9
Pages:336

TableofContents|Index

Copyright
AbouttheAuthor
AbouttheTechnicalReviewers

Acknowledgments
IconsUsedinThisBook
Introduction
HowThisBookIsOrganized
WhoOughttoReadThisBook
StuffYou'llFindinThisBook
ForMoreInformation...
Chapter1.TouringtheHistoryMuseumofTelephony
DissectingaTelephonyNetwork
ThePublicSwitchedTelephoneNetwork:ThePhoneSystemThatYouGrewUp
With
PrivateBranchExchanges:HowBigBusinessesTalk
KeySystems:HowSmallBusinessesTalk
Ringing,DialTone,andOtherBellsandWhistles
CaseStudy:YourTurntoPutthePiecesinPlace
ChapterSummary
ChapterReviewQuestions
Chapter2.MakingWaves:TurningYourVoiceinto1sand0s
ChoppingYourVoiceinto"Byte"-SizePieces
SqueezingYourVoiceintoaSmallerPackage
DecidingHowMuchBandwidthIsEnough
CaseStudy:YourTurntoChoosetheBandwidth

ChapterSummary
ChapterReviewQuestions
Chapter3.PavingthePathwaytoaVoiceoverIPNetwork
CompetingwiththeReliabilityofExistingPhoneSystems
ReplacingPBXTrunks:OutwiththeOld,InwiththeNew
ConnectingaRoutertoaPhoneLine
ConnectingaRoutertoaDigitalCircuit
VoiceoverIPintheHome
CaseStudy:YourTurntoPutthePiecesofthePuzzleTogether
ChapterSummary
ChapterReviewQuestions
Chapter4.Meetthe"Brain"oftheVoiceoverIPNetwork
ReplacingYourOldPhoneSwitchwithCiscoCallManager
ThereIsPowerinNumbers:GroupingCiscoCallManagersTogether
Designers'Challenge:PlacingCiscoCallManagersintheNetwork
SettingGuidelinesforWhoCanMakeCalls
ReplacingOldPhoneswithIPPhones
SelectingFeaturesforIPPhones
TheConeofSilence:SecuringVoice
APictureIsWorthaThousandWords:AddingVideotoVoiceCalls

CiscoCallManagerinthe"Express"Lane
CaseStudy:YourTurntoDoanExtremePhoneSystemMakeover
ChapterSummary
ChapterReviewQuestions
Chapter5.SpeakingtheGateways'Languages
GatewayProtocols:TheLanguagesofLove
TheTriedandTrueLanguage:H.323
Cisco'sVeryOwn:MGCP
TheNewKidontheBlock:SIP
CaseStudy:YourTurntoBeTrilingual
ChapterSummary
ChapterReviewQuestions
Chapter6.WhyQualityMatters
TooManySwimmersintheBandwidthPool
BeingPoliticallyIncorrect:TreatingSpecialTrafficinaSpecialWay
GivingVoiceTopPriority
FeelingaLittleCongested?
SettingSpeedLimitsonTraffic
DoingMorewithLess(Bandwidth)

AutomaticallyConfiguringQoSwithAutoQoS
CaseStudy:YourTurntoUseYourNew"QualityofService"Tools
ChapterSummary
ChapterReviewQuestions
Chapter7.VoIPSupportingRoles
LeaveaMessageattheBeep:theCiscoAnswertoUnifiedMessaging
HaveYourPeopleCallMyPeople:CreatingaConferenceCall
YourCallIsVeryImportanttoUs:TheCiscoAnswertoCallCenters
CaseStudy:YourTurntoPickAdd-OnFeatures
ChapterSummary
ReviewQuestions
AppendixA.AnswerstoChapterReviewQuestions
Chapter1
Chapter2
Chapter3
Chapter4
Chapter5
Chapter6
Chapter7
AppendixB.NextSteps:WhereDoIGoFromHere?
BasicRouterandSwitchConfiguration
IPTelephonyCertifications
GlossaryA
A

B
C
D
E
F
G
H
I
J
K
L
M
N
O
P

Q
R
S
T
U
V
W
Index


Copyright
VoiceoverIPFirst-Step
KevinWallace
Copyright©2006CiscoSystems,Inc.
Publishedby:
CiscoPress
800East96thStreet
Indianapolis,IN46240USA
Allrightsreserved.Nopartofthisbookmaybereproducedor
transmittedinanyformorbyanymeans,electronicor
mechanical,includingphotocopying,recording,orbyany
informationstorageandretrievalsystem,withoutwritten
permissionfromthepublisher,exceptfortheinclusionofbrief
quotationsinareview.
PrintedintheUnitedStatesofAmerica1234567890
FirstPrintingDecember2005
LibraryofCongressCataloging-in-PublicationNumber:

2005926125

WarningandDisclaimer
Thisbookisdesignedtoprovideinformationaboutthebasicsof
VoiceoverIP(VoIP).Everyefforthasbeenmadetomakethis
bookascompleteandasaccurateaspossible,butnowarranty
orfitnessisimplied.


Theinformationisprovidedonan"asis"basis.Theauthors,
CiscoPress,andCiscoSystems,Inc.,shallhaveneitherliability
norresponsibilitytoanypersonorentitywithrespecttoany
lossordamagesarisingfromtheinformationcontainedinthis
bookorfromtheuseofthedisksorprogramsthatmight
accompanyit.
Theopinionsexpressedinthisbookbelongtotheauthorand
arenotnecessarilythoseofCiscoSystems,Inc.

TrademarkAcknowledgments
Alltermsmentionedinthisbookthatareknowntobe
trademarksorservicemarkshavebeenappropriately
capitalized.CiscoPressorCiscoSystems,Inc.cannotattestto
theaccuracyofthisinformation.Useofaterminthisbook
shouldnotberegardedasaffectingthevalidityofany
trademarkorservicemark.
Publisher
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Dedications
ThisbookisdedicatedtoVivian,mybrideof11years.


AbouttheAuthor
KevinWallace,CCIENo.7945,CCSI,CCNP,CCDP,MCSE4,
CNE4/5,isafull-timeinstructorforThomsonNETg.With16
yearsofCiscointernetworkingexperience,Kevinhasbeena
networkdesignspecialistforTheWaltDisneyWorldResortand
anetworkmanagerforEasternKentuckyUniversity.Kevinholds
abachelorofsciencedegreeinelectricalengineeringfromthe
UniversityofKentucky.AmongKevin'sotherpublicationcredits
areCCDA/CCDPFlashCardsandExamPracticePack
(coauthoredwithAnthonySequeira),CCIERoutingand

SwitchingFlashCardsandExamPracticePack(coauthoredwith
AnthonySequeira),andCiscoIPTelephonyFlashCardsand
ExamPracticePack,allofwhichareavailablefromCiscoPress.
Additionally,KevinauthoredtheCiscoEnterpriseVoiceover
DataDesign(EVoDD)3.3course,wasacontributingauthorfor
theCiscoIPTelephonyTroubleshooting(IPTT)2.0course,and
haswrittenfortheCiscoPacketmagazine.Kevinalsoholdsthe
IPTelephonyDesignSpecialistandIPTelephonySupport
SpecialistCQScertifications.


AbouttheTechnicalReviewers
DaveGoodwin,CCIENo.4992(Routing&Switchingand
Voice),isacustomersupportengineerfortheCiscoTechnical
AssistanceCenter(TAC).Heisresponsibleforproviding
escalationsupporttotheCiscoTACvoiceteamsworldwide,as
wellasdiscoveringandresolvingissuesinnewandemerging
CiscoIPCommunicationsproducts.Healsoworkscloselywith
theCiscoengineeringteamsandisactivelyinvolvedinthefield
trialsofnewproducts.DavehasbeenwithCiscoforseven
yearsandhasworkedasanetworkengineerfortenyears.
GrahamGudgin,CCIENo.2370,isatechnicalmarketing
engineerintheVoiceSystemsEngineeringgroupatCisco
Systems.HeisamemberoftheteamresponsibleforIP
CommunicationssystemdesignsandthecreationofSolution
ReferenceNetworkDesignspostedat
Previously,Grahamworkedin
thefieldandattheCiscoTACspecializinginthedevelopment
anddesignofpacket,cell,timedivisionmultiplexing(TDM)andvoice-basedsystems.
ToddStoneisaUnitycustomersolutionsarchitectforCisco

Systems.Toddwasresponsibleforinstallingtheveryfirst
versionsoftheproductandhassincebecomeinvolvedinthe
architecturalaspectsofUnity.


Acknowledgments
Myfamily'ssupportmadethisbookpossible.Tomywife,
Vivian,Ifeelsoblessedtowalkthroughlifewithyou.Tomy
daughter,Sabrina,yournaturalsenseofhumorkeepsusallin
stitches,andyourcaringforotherswarmsourhearts.Tomy
daughter,Stacie,yourenthusiasmforlifeandthewayyou
naturallyattractnewfriendsmakesmeproudtobeyourdad.
TotheinstructorteamatThomsonNETg,leadbyTomWarrick
andMichaelWatkins,workingwithyoupushesmetobemy
bestandtocontinuallygrow.And,asalways,Iacknowledgemy
HeavenlyFatherforHisblessingsinmylife.




IconsUsedinThisBook




Introduction
EversinceAlexanderGrahamBellinventedthetelephonein
1876,telephonysystemshavebeenapartofourlife.More
recently,withtheadventoftheInternet,muchofourday-todaycommunication(forexample,e-mail)crossesanIPnetwork
(forexample,theInternet).Today,thesetwoworldsare

merging,andcompaniescanplacephonecallsovertheir
existingdatanetworkinfrastructuresusingatechnologycalled
VoiceoverIP(VoIP).
ThetopicofVoIPattractspeopleofdiversebackgrounds,from
theprivatebranchexchange(PBX)technician,tothenetwork
engineer,tothehomeuserwantingtoreducehisorher
monthlyphonebill.Thisbookgetsallreadersonthesamepage
byreviewinglegacytelephonysystems,andthenitproceedsto
delveintothebravenewworldofVoIP.
WhenIteachVoIPcourses,Iuseplentyofmetaphorstohelp
anchorwhatcanbecomplexconcepts.TheformatoftheCisco
PressFirst-StepSeriesallowsmetotalkwithyouandshare
stories,justasifyouwereattendingoneofmyclasses.So,
expectplentyofmetaphors,analogies,andevenalittlehumor.
Also,ifyou'relikeme,youlearnbestfromexamples.So,I've
sprinkledmultiplecasestudiesandotherexamplesthroughout
thisbook.


HowThisBookIsOrganized
Thisbookisorganizedinalogical,step-by-stepapproachto
buildingacomprehensiveunderstandingofVoIP.Thatapproach
isdemonstratedinthefollowingoutlineofthechapters:
Chapter1,"TouringtheHistoryMuseumof
Telephony"Reviewsthefunctionandpurposeofpublic
switchedtelephonenetwork(PSTN),PBX,andkeysystem
telephonynetworks.Thechaptercoverstopicssuchas
supervisorysignaling,alertsignaling,andaddresssignaling.
NeartheendofChapter1,acasestudyisintroduced.The
scenariointroducedinthecasestudyisrevisitedand

expandeduponinfuturechapters.
Chapter2,"MakingWaves:TurningYourVoiceinto
ZerosandOnes"Explainshowthehumanvoicecanbe
convertedintoaseriesofonesandzeros,andhow
bandwidthcanbepreservedontheWideAreaNetwork
(WAN)bycompressingvoicetraffic.
Chapter3,"PavingthePathwaytoaVoiceoverIP
Network"Buildsonthelegacytelephonyconcepts
establishedinChapter1,aswellasthetheoryofdigitizing
voicecoveredinChapter2,byintroducingthereadertoan
initialmigrationstepawayfromtraditionaltelephony
systems,whichinvolvessendingcallsacrossaWANinstead
ofthePSTN.
Chapter4,"Meetthe'Brain'oftheVoiceoverIP
Network"IntroducesyoutotheworldofIPtelephony,
focusingonCiscoCallManager(CCM)solutions.Current
CCM4.xfeatures(forexample,securityandvideo)are
discussed.


Chapter5,"SpeakingtheGateways'
Languages"ExpandstheIPtelephonysolutionbeyonda
single"cluster"totherestoftheworldviagateways.
Gatewayprotocols(forexample,H.323,MGCP,andSIP)are
discussedasthepotentialgatewayprotocolsofchoice.
Chapter6,"WhyQualityMatters"Addressesqualityof
service(QoS)issuesinaVoIPnetwork.Somedesigners
makethemistakeofsimplysuperimposingvoicetrafficona
datanetwork.However,voicetrafficneedshighpriorityand
haslittletolerancefordelay.Therefore,thischapter

introducesaplethoraofQoStechnologiesfortreating
specialtraffic(forexample,voice)inaspecialway.
Chapter7,"VoIPSupportingRoles"Introducesyouto
optional,value-addedIPtelephonycomponents,suchas
CiscoUnity,whichprovidesaunifiedmessagingsolution.
Conferencingandcontactcenterapplicationsarealso
discussed.
AppendixA,"AnswerstoChapterReview
Questions"Eachchapterendswitha"ChapterReview
Questions"section.Thisappendixrepeatsthequestionsand
listsanswersaswell.
AppendixB,"NextSteps:WhereDoIGoFrom
Here?"Whilethisbookintroducesyoutothetheory
surroundingVoIP,manyreadersmightwanttotakethe
nextstep:learninghowtoconfigureVoIPequipment.This
appendixrecommendsCiscoPressbooksandcourses
offeredbyCiscoLearningPartnersthatleadnotonlytoa
furtherunderstandingofVoIP,butalsotoCisco
certifications.
GlossaryTheworldofVoIPrequiresitscitizenstouseoften
confusinglingo.Thisappendixgivesclearandconcise


definitionsforthemostimportanttermsintroducedinthe
book.


WhoOughttoReadThisBook
Ifyouworkwithdatanetworks(perhapstosende-mailor
transferfiles),ifyouworkwithtelephonynetworks(perhaps

withacorporatePBXsystem),ifyou'reahomeuserinterested
inhowVoIPcanreduceyourmonthlyphonebill,orifthe
conceptofVoIPsimplyintriguesyou,thisbookisforyou.The
conceptsinthisbookarepresentedinplainlanguage,soyou
don'tneedin-depthbackgroundknowledgetocomprehendthe
technologiespresented.




StuffYou'llFindinThisBook
Thisbookincludesseveralfeaturestohelpyoudigestthe
materialswithminimalheartburn.Withthesolidfoundation
gainedthroughthisbook,youcanlearnthingsaboutnewVoIP
technologiesmoreeasily,talkVoIPwithothers,orbebetter
preparedtobeginacareerinVoIP:
ChapterobjectivesEverychapterbeginswithalistof
objectivesthatareaddressedinthechapter.Theobjectives
arerevisitedinthechaptersummary.
HighlightedkeywordsandGlossaryThroughoutthis
book,youwillseetermsformattedwithitalics.Theseterms
areparticularlysignificant.Ifyoufindyouaren'tfamiliar
withthetermoratanypointneedarefresher,simplylook
upthetermintheGlossarytowardtheendofthebookto
findafulldefinition.
CasestudiesEverychapterconcludeswithacasestudy.
ThecasestudyscenarioisintroducedattheendofChapter
1andexpandeduponinallremainingchapters.Thecase
studiesgiveyoutheopportunitytotakewhatyou've
learnedinachapterandputyournewfoundknowledgeto

workinaspecificdesignscenario.
ChaptersummariesEverychapterconcludeswitha
comprehensivechaptersummarythatreviewschapter
objectives,ensuringcompletecoverage,anddiscussesthe
chapter'srelationshiptofuturecontent.
ChapterreviewquestionsEverychapterconcludeswith
reviewquestions.Thesequestionstestthebasicideasand
conceptscoveredineachchapter.Youcanfindtheanswers


tothequestionsinAppendixA.
NontechieheadingsandtitlesThetitlesandheadings
throughoutthisbookavoidtheuseoftechnicaltermswhen
possible,focusinginsteadonwordsthatconnotesomething
abouttheunderlyingconcepts.


ForMoreInformation...
Ifyouhaveanycommentsaboutthisbook,youcansubmit
themthroughtheciscopress.comwebsite.Simplygotothe
website,selectContactUs,andtypeinyourmessage.
Ihopeyouenjoyyourfirststepintoadeeperknowledgeof
VoIP,andItrustthatthisfirststepwillbeagiantleapinyour
understandingofVoIP.