Multitech 810-FX Fax Machine User Manual

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Chapter4–ConfiguringYourMultiVOIP

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

H.323CallSignalingParameterDefinitions.

FieldName Values Description

UseFastStart Y/N EnablestheH.323FastStartprocedure.Mayneedtobeenabled/disabledfor

compatibilitywiththird‐partyVOIPgateways.

SignalingPort port Default:1720(H.323)

AllowIncomingCalls

ThroughGatekeeperOnly

Y/N Whenselected,incomingcallsareacceptedonlyifthosecallscomethroughthe

gatekeeper.

GateKeeperRASParameters

PrimaryGK ‐‐ Thisisthepreferredgatekeeperforcontrollingthetrafficofthe currentVOIP.

AlternateGK

1and2

‐‐ AfirstandasecondalternategatekeepercanbespecifiedforusebythecurrentVOIPfor

situationswherethePrimaryGKisbusyorotherwiseunavailable.

IPAddress n.n.n.n IPaddressoftheGateKeeper.

RASPort 1719 Well‐knownportnumberforGateKeepers.Mustmatchportnumber(1719).

GatekeeperName alpha‐

numeric

Optional.ThenameoftheGateKeeperwithwhichthisMultiVOIPistryingtoregister.A

primarygatekeeperandtwoalternateunitsarelisted.

RASTTLValue seconds TheH.323Gatekeeper“TimetoLive”value.AssoonasaMultiVOIPgatewayregisters

withagatekeeperacountdowntimerbegins.TheRASTTLValueistheintervalofthe

countdowntimer.BeforetheTTLcountdownexpires,theMultiVOIPgatewayneedsto

notregisterbeforetheTTLintervalexpires,theMultiVOIPgateway’sregistrationwith

thegatekeeperexpiresandthegatekeepernolongerpermitscalltraffictoorfromthat

gateway.Callsinprogresscontinuetofunctionevenifthegatewaybecomesde‐

registered

GatekeeperDiscovery

PollingInterval

integer

60‐300

TheintervalbetweentheVOIPgateway’ssuccessiveattemptstoconnecttoandbe

governedbyahigherlevelgatekeeper.ThePrimaryGKisthehighestlevelgatekeeper.

AlternateGK1issecond;AlternateGK2isthelowest.

UseOnlineAlternate

GatekeeperList

Whenselected,VOIPseeksanalternategatekeeper(whennoneofthe3gatekeepersshownonthis

windowareavailable)fromalist.ThelistresidesonthePrimarygatekeeperoroneoftheAlternate

gatekeepers.ThegatekeeperholdingthelistwoulddownloadthatlistontotheVOIPgatewayswithin

thesystem.

H.323Version4Options

H.323Multiplexing Y/N Signalingformultiplephonecallscanbecarriedonasingleportratherthanopeninga

separatesignalingportforeach.Thisconservesbandwidthresources.

H.245Tunneling(Tun) Y/N H.245messagesareencapsulatedwithintheQ.931call‐signalingchannel.Amongother

things,theH.245messagesletthetwoendpointstelleachotherwhattheirtechnical

capabilitiesareanddeterminewho,duringthecall,istheclientandwhoistheserver.

TunnelingistheprocessoftransmittingtheseH.245messages

throughtheQ.931

channel.ThesameTCP/IPsocket(orlogicalport)alreadybeingusedfortheCallSignaling

ChannelisthenalsousedbytheH.245ControlChannel.Thisencapsulationreducesthe

numberoflogicalports(sockets)neededandreducescallsetuptime.

ParallelH.245

(FS+Tun)



Y/N FS(FastStart)isaQ.931featureofH.323v2tohastencallsetupaswellas‘pre‐opening’

themediachannelbeforetheCONNECTmessageissent.Thispre‐openingisa

requirementforcertainbillingactivities.UnderParallelH.245FS +Tun,thisFastConnect

featurecanoperatesimultaneously

withH.245Tunneling.

Annex–E(AE) Y/N MultiplexedUDPcallsignalingtransport.AnnexEishelpfulforhigh‐volumeVOIPsystem

endpoints.GatewayswithlesservolumecanaffordtouseTCPtoestablishcalls.

However,forlargervolumeendpoints,thecallsetuptimesandsystemresourceusage

underTCPcanbecomeproblematic.AnnexEallowsendpointsto

performcall‐signaling

functionsundertheUDPprotocol,whichinvolvessubstantiallystreamlinedoverhead

(thisfeatureshouldnotbeusedonthepublicInternetduetopotentialproblemswith

securityandbandwidthusage).

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Multitech 810-FX Fax Machine User Manual