Specifications

ConfiguringVoIPGateways
Introduction
ExternalcallscanbemadeonPSTN/phonelinesorviaVoIPproviders.AtraditionalPBXrequires
you to connect the PSTN lines to the PBX hardware box; however in the case of 3CX Phone
Systemyouhavemoreoptions:
● Connect PSTN lines (physical phone lines) to a VoIP Gateway situated on your internal
network.
● ConnectPSTNlinestoaVoIPaddincard,installedinthe3CXPhoneSystemmachineor
onanothermachine.
● Use a “hosted” phone line from a VoIP Service Provider. In this case the VoIP service
providergivesyoutheabilitytomakecallsviayourinternetconnection.Thisisexplainedin
thenextchapter.
To make & receive external phone calls via your regular phone lines, you will have to buy and
configure a VoIP gateway or VoIP addin card. This chapter explains what they are and how to
configurethem.
WhatisaVoIPGatewayorVoIPAddonCard?
AVoIPgatewayisadevicewhichconvertstelephonytrafficintodata,sothatitcanbetransmitted
overacomputernetwork.InthismannerPSTN/telephonelinesare“converted”toSIPextensions,
allowingyoutoreceiveandplacecallsviatheregulartelephonynetwork.VoIPGatewaysexistfor
analoglinesaswellasBRI,PRI/E1linesandT1lines.VoIPcardsdothesamething,butareaddin
cardsthatareinstalledintoacomputer.
WhatisaPort?
AportisaphysicallineoutletonagatewayorVoIPcard.Inthecaseofananalogline,oneportis
usedforeachvoicechannel.InthecaseofBRIISDN,oneportallowsfortwovoicechannels,and
inthecaseof E1orT1ports,eachport represents30and23channelsrespectively. Justasitis
necessarytoconfigureaphonetoregisterwiththephonesystem,itisalsonecessarytoconfigure
theVoIPgatewayorcardtoregisteritsportswith3CXPhoneSystem.EachportgetsaSIPuserID,
Passwordandvirtualextensionnumber.TotheIPPBX,thePSTNlinesappearjustlikeanyother
SIPextensionwhichcanbeusedforexternalcalls.
SupportedVoIPGateways
ItisimportanttouseaVoIPgatewaysupportedby3CX.Supportedgatewayshavebeentestedby
3CXandareautomaticallyconfiguredwith theircorrectsettings.Ifusingthedefault configuration,
3CX will also provide first line support of their use with 3CX phone System. A list of the latest
supportedgatewayhardware,canbefoundonthe3CXSupportpage.
ConfiguringVoIPGateways
InordertomakeuseofaVoIPGateway:
1. In3CXPhoneSystem,configurethesettingsthatwillbeusedbytheGatewaytoconnectto
thePBX.
2. ConfiguretheVoIPGatewayusingthesettingsmadeavailablebythePBX
Let’sseehowthisisdoneinmoredetail:
Step1:ConfiguretheVoIPGatewayin3CXPhoneSystem