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MultiVOIP®Voice/FaxoverIPGateways 83

Chapter 5 – Configuring the Phone

Book

WhenaVOIPservesaPBXsystem,ensurethattheVOIP’soperationistransparenttothetelephoneenduser.

MakesuretheVOIPdoesnotdialextradigitstoreachuserselsewhereonthenetworkthattheVOIPserves.

VOIPservicecommonlyreducesdialeddigits.Thisallowsusers(servedbyPBXs

infacilitiesindistantcities)to

dialtheirco‐workerswith3‐,4‐,or5‐digitextensionsasiftheywereinthesamefacility.

Also,ensuretheVOIPsetupallowsuserstomakecallsonanon‐tollbasistoanynumbersaccessiblewithouttoll

byusers

atallotherlocations ontheVOIPsystem.Consider,forexample,acompanywithVOIP‐equippedoffices

inNewYork,Miami,andLosAngeles,eachservedbyitsownPBX.WhentheVOIPphonebooksaresetcorrectly,

personnelintheMiamiofficeshouldbeabletomakecallswithouttoll

notonlytothecompany’sofficesinNew

YorkandLosAngeles,butalsotoanynumberthat’slocalinthosetwocities.

ToachievetransparencyoftheVOIPtelephonysystemandtogivefulla ccesstoalltypesofnon‐tollcallsmade

possiblebytheVOIPsystem,the

VOIPadministratormustproperlyconfigurethe“Outbound”and“Inbound”

phone‐booksofeachVOIPinthesystem.

The“Outbound”phonebookforaparticularVOIPunitdescribesthedialingsequencesrequiredforacallto

originatelocally(typicallyinaPBXinaparticularfacility)andreachanyofitspossibledestinations

atremote

VOIPsites,includingnon‐tollcallscompletedinthePSTNattheremotesite.

The“Inbound”phonebookforaparticularVOIPunitdescribesthedialingsequencesrequiredforacallto

originateremotelyfromanyotherVOIPsitesinthesystem,andtoterminateonthatparticularVOIP.

TheMultiVOIP’sOutboundphonebookli ststhephonestationsitcancall;itsInboundphonebookdescribesthe

dialingsequencesthatcanbeusedtocallthatMultiVOIPandhowthosecallsaredirected.Thephone numbers

arenotlistedindividually,butare,instead,describedbyrule. 

IdentifyRemoteVOIPSitetoCall

AfterinstallingtheMultiV OIP,confirmthatitisconfiguredandoperatingproperlybycheckingend‐to‐end

connectivity.Todoso,discoveranotherVOIPthatyoucancallfortesting .Obtaintheremotesite’sIPand

telephoneinformation.

IfthisistheveryfirstVOIPinthesystem,coordinatetheinstallation

ofthisMultiVOIPwithaninstallatio nof

anotherunitataremotesite.

IdentifyVOIPProtocoltobeUsed

DetermineifyouwanttouseH.323,SIP,orSPP.Althoughyoucanmixprotocols inasingl eVOIPsystem,itis

bettertousethesameVOIPprotocolforallVOIPunitsinthesystem.

SPPisanon‐standardprotocoldevelopedbyMulti‐Tech.SPPisnotcompatible with

the“Proprietary”protocol

usedinMulti‐Tech’searliergenerationofVOIPgate ways.

The–SSseriesofMultiVOIPsonlysupporttheSIPprotocol.

The–FXmodelsdonotsupportH.323.

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