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Chapter5–ConfiguringthePhoneBook
MultiVOIP®Voice/FaxoverIPGateways 91
ConfiguringAlternateRouting
AlternateroutingprovidesanalternatepathforcallsiftheprimaryIPnetworkcannotcarrythetraffic.
Sometimesduringfailure,calltrafficistemporarilydivertedintothePSTN.However,youalsousealternate
routingtodiverttraffictoaredundant(backup)unitincaseoneVOIPunitfails.
Alternateroutingfacilitates
PSTNFailoverprotection.Itallowsyoutore‐routeVOIPcallsautomaticallyoverthe
PSTNiftheVOIPsystemfails.YoucanprogramtheMultiVOIPtorespondtoexcessivedelaysinthetransmission
ofvoicepackets,whichtheMultiVOIPinterpretsasafailureoftheIPnetwork.Upondetectingan
excessive
delayintransmissionofvoicepackets(overlyhigh“latency”inthenetwork)theMultiVOIPdivertsthecallto
anotherIPaddress,whichitselfisconnectedtothePSTN(forexample,viaanFXOportontheself‐same
MultiVOIPisconnectedtothePSTN).
Tosetupalternaterouting:
1. ClickAdvanced.TheAlternateRoutingwindowopens.
2. SpecifytheIPaddressofthealternaterouteforeachdestinationpatternentryintheOutboundPhonebook.
Thefollowingtabledescribesalternateroutingfields.
AlternateRoutingFieldDefinitions
FieldName Values Description
AlternateIP
Address
n.n.n.n Alternatedestinationforoutbounddatatrafficifexcessivedelayindatatransmission.
RoundTrip
Delay
Defaultis300
milliseconds
TheRoundTripDelaydetermineswhenadatapathwayisconsideredblocked.Whenthe
delayexceedsthethresholdspecifiedhere,thedatastreamisdivertedtothe alternate
destinationspecifiedastheAlternateIPAddress.