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volte信令流程详解8个步骤
EnglishAnswer:
VolteSignalingFlow:AStep-by-StepGuide.
Step1:Registration.
Thedeviceinitiatestheregistrationprocessby
sendingaRegistrationRequestmessagetothenetwork.This
messageincludesthedevicesidentity,suchasthe
InternationalMobileEquipmentIdentity(IMEI)andthe
InternationalMobileSubscriberIdentity(IMSI).
Step2:Authentication.
Thenetworkauthenticatesthedevicebysendinga
challenge.Thedevicerespondswitharesponsethatis
generatedusingasharedsecret.Iftheresponseiscorrect,
thedeviceisauthenticated.
Step3:NetworkSelection.
Thenetworksendsalistofavailablenetworkstothe
device.Thedeviceselectsanetworkbasedonfactorssuch
assignalstrengthandavailabilityofservices.
Step4:MobilityManagement.
ThedevicesendsaTrackingAreaUpdate(TAU)message
tothenetworkwhenitmovesfromonecelltoanother.The
networkupdatesitslocationinformationandmaintainsthe
devicesconnection.
Step5:CallEstablishment.
Toestablishacall,thedevicesendsanInvitemessage
totheintendedrecipient.Therecipientsdeviceresponds
withanOKmessage.Thenetworksetsupthecalland
allocatesresources.
Step6:CallProgress.
ThedevicesexchangeProgressmessagestoindicatethe
progressofthecall.Forexample,thedevicesmaysend
messagestoindicatethatthecallisringingorthatthe
callisconnected.
Step7:CallTermination.
Toterminateacall,thedevicesendsaByemessageto
theintendedrecipient.Therecipientsdeviceresponds
withanOKmessage.Thenetworkreleasestheresources
allocatedtothecall.
Step8:Deregistration.
Thedeviceinitiatesthederegistrationprocessby
sendingaDeregistrationRequestmessagetothenetwork.
Thismessageindicatesthatthedeviceisnolonger
connectedtothenetwork.Thenetworkreleasesthe
resourcesalloca
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