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Appendix E.  IPT Design Phase: IPT Requirement Analysis Questionnaire

Appendix E.  IPT Design Phase: IPT Requirement Analysis Questionnaire

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ClassofRestrictionRequirements

Call-RoutingandDialPlanRequirements

SizingthePSTN/GatewayTrunks

PowerRequirements(PerSite/PerSwitchSpecific)

CallAdmissionControlConsiderations

CorporateDirectoryRequirements

Conferencing,Transcoding,andMTPRequirementsfor

CentralSites

MusiconHoldRequirements

Somesectionsmightnotbeapplicabletothenetworkthatyou

aredesigning,soskipanysuchsections.



IPTelephonyDeploymentModel

Thetypeofdeploymentmodelthatyoushouldchoosedepends

on,amongmanyotherfactors,yourcustomer'sneeds,users,

geographicaldistributionofusersanddevices,call-processing

volumeateachlocation,anddisaster-recoveryplans.

Youhavefourchoicesofdeploymentmodels,whichare

numberedforeasyreferenceinthisquestionnaire:

1. Singlesitewithcentralizedcallprocessing

2. MultisiteWANwithcentralizedcallprocessing

3. MultisiteWANwithdistributedcallprocessing

4. ClusteringovertheWAN

UseTableE-1toidentifythechosendeploymentmodel.

TableE-1.IPTelephonyDeploymentModel

No.



Question



1



WhatIPTdeploymentmodelareyou

adopting?



Answer



1

2

3

4

(Refertotheprevious

listforthemodelname)



2



Ifyouhaveselectedoption4,whatis

theround-triptime(RTT)betweenthe

siteshostingtheserversbelongingto

thesamecluster?

RTT_____ms



Notes/Comments

ThechoiceofIPTdeploymentdependsonyournetwork

architectureandrequirements.Refertothesection"IP

TelephonyDeploymentArchitectures"inChapter1,"CiscoIP

TelephonySolutionOverview,"tochoosetherightdeployment

model.



CodecSelection

Theselectionofcodecaffectstheamountofbandwidththat

needstobeprovisionedontheWANlinks.TableE-2providesa

listofquestionsthatyouneedtocollectfromthecustomer

regardingitscodecchoice.

TableE-2.CodecSelectionforLAN/WAN

No.



Question



1



Whatcodecdoyouwanttouse?



Answer



LAN(G.711)

LAN(G.729)

LAN(G.723)

LAN(WideBand)

WAN(G.711)

WAN(G.729)

WAN(G.723)

WAN(WideBand)



2



DotheVoIPcallsrequirecompressed

RTPwhenbeingsentovertheWAN?



Yes

No



Notes/Comments

Youneedtocollectthisinformationforeachsite.Incaseofa

centralizedcall-processingdeploymentwithmultipleremote

branchsites,youneedtoidentifythetypeofcodectobeused

betweenthecentralsiteandeachremotesite.



LegacyVoice-MailIntegrationRequirements

IftheintegrationofCallManagerwithalegacyvoice-mail

systemisarequirement,providetheinformationdetailedin

TableE-3.

TableE-3.LegacyVoice-MailIntegrationRequirements

Voice-Mail

System

Site Type,

Number

Name Version,

ofUsers

Ports

Configured



Is

Integration Integration

Method

with

with

Existing

CallManager PBX

Required?



Typeof

Gateway

Required

from

Cisco



















































Notes/Comments

Someofthemajorsupportedintegrationmethodsarethe

following:

SkinnyClientControlProtocol(SCCP)withCiscoUnity

SimplifiedMessageDeskInterface(SMDI)-capablevoicemailsystemwithCallManagerthroughaMediaGateway

ControlProtocol(MGCP)gatewayorwithaVG-248

CiscoDigitalPBXAdapter(DPA)integrationforOctelor

NortelMeridianvoicemailsystems



CTI/TSPintegrationforothersystems

Afteryoucollecttheinformationaboutthelegacyvoice-mail

system,youcandeterminethetypeofintegrationrequiredto

integratethevoice-mailsystemwiththeIPTsystem.



LegacyPBXIntegrationRequirements

IfintegrationofCallManagerwithalegacyPBXsystemisa

requirement,obtaintheinformationdetailedinTableE-4.Table

E-4showssomesampledatathatwillhelpyoutounderstand

thetypeofinformationthatneedstobegathered.

TableE-4.LegacyPBXIntegrationRequirements



Typeof

Integration

Gateway

PBX

IPT

IPT

Site

Trunk

Requiredfrom

Type/Software TransformationIntegration/Full Users/PBX

Name

Type/Number Cisco/Software

version

Migration?

Users

ofTrunks

Versionfor

Integration

Detroit Definity



Integration



200

(IPT)/100

(PBX)



New

York



FullMigration



300(IPT)/0 NotApplicable NotApplicable

(PBX)



Siemens



T1-PRI/1



WS-X-6608T1/PCG00000



Notes/Comments

YoucanusetheinformationcollectedfromTableC-1in

AppendixC,"IPTPlanningPhase:TelecomInfrastructure

AnalysisQuestionnaire,"tofilloutpartofTableE-4.Afteryou

havethePBXdetailsforeachsite,youcandecideonthevoice

gatewaymodelandtheappropriatesoftwareversionrequired

onthevoicegatewayforsuccessfulintegration.Incaseof

integrationwithanIPTsystem,theexistingtrunkscurrently

terminatingonthePBXwillbedividedbetweenthePBXandthe

voicegatewayaccordingtotheusersplitratiotopreservebusy



hourcallattempts(BHCA).

Forexample,inTableE-4,fortheDetroitsite,theDefinityPBX

systemneedstobeintegratedwiththeIPTsystem.Outof300

users,200userswillbemigratedtotheIPTsystem,and100

userswillberetainedonthePBXsystem.Currently,thePBX

hasthreeT1-PRItrunksinterfacingthePSTN.Topreserve

BHCA,duringintegration,twotrunkswillbemovedtothevoice

gatewayinterfacingthePSTN.

Youneedtodeterminetheapproximatecallvolumebetween

theusersontheIPTsystemandtheusersremainingonthe

PBXsystem.Thisinformationisusefultosizethetrunks

requiredbetweenthePBXsystemandthevoicegateway.The

sampleDetroitsiteinformationprovidedinTableE-4usesone

PRItrunk.



SizingtheCallManagerCluster

CallManagerserverscanbegroupedtogethertoformacluster.

AclustercancontainamaximumofeightCallManagerservers

doingthecallprocessing.Therecanbeotherserversinthe

clustertoperformdedicatedfunctions,suchasaPublisher

serverthathostsaread/writedatabase,adedicated

TFTP/DHCPserver,adedicatedMusiconHold(MoH)server,and

soforth.Thepublisherdatabaseisusedasasinglepointof

administrationfortheclusterconfigurationchangesandto

produceCallDetailRecords(CDRs).TheTFTPserverfacilitates

thedownloadofconfigurationfiles,deviceloads(operating

code),andringtypes.

TheinformationinTableE-5needstobecollectedonaper-site

basistodeterminethenumberofclusters,thenumberof

CallManagerserverspercluster,andthetypeofhardware

platformrequiredpercluster.

TableE-5.CallManagerClusteringRequirements



SiteName



IP

Phones

Voicewith

Mail

Model

Ports

Numbers



Voice

Gateways

Include Conferencing,

TAPI/JTAPI the

Transcoding,

Interfaces Model

MTP,MoH

and

Resources

Number

ofDS0s































































Notes/Comments

ACallManagerclusterconsistsoftwoormoreCallManager

servers.Thenumberofdevicesthatcanbesupportedbya

singleCallManagerserverdependsonthequantityofdevice

typesthatneedtoberegistered,suchasIPPhonesand

gateways.TocorrectlysizetheCallManagercluster,youneedto

collecttheinformationgiveninTableE-5andfollowthe

CallManagercluster-sizingguidelinesgiveninCiscoIP

TelephonySolutionReferenceNetworkDesign(SRND)at

http://www.cisco.com/go/srndtodecideonthehardware

platformandnumberofserversinthecluster.



BranchOfficeIPTRequirements

Whenconnectingregionaloffices(branchoffice)tothemain

site,SurvivableRemoteSiteTelephony(SRST)orCisco

CallManagerExpress(CCME)featuresareused.UseTableE-6

tocollecttheinformationneededtodeterminewhetherSRST

andCiscoCCMEshouldbeimplemented.TableE-6isapplicable

forCallManagerdeploymentmodels2,3,or4(refertoTableE1formodeldefinitions).

TableE-6.RequirementsforSRST/CCME

1



2



3



4



5



6



7



8



9



10 11 12 13 14 15 16 17 18 19



























































































































































1. BranchOfficeName,Address

2. MemberofCallManagerCluster

3. BandwidthfromtheHub,TypeofLink(FR/Leased/ATM),

CurrentLinkUtilization

4. NumberofIPPhonesPlanned

5. NumberofIPPhoneswithSingleLineAppearance

6. NumberofIPPhoneswithMultipleLineAppearances

7. CurrentBranchRouterModel,Memory,IOSVersion

8. Codec,G.711,G.729,G.723,andWideBand



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