tagaccept

ProcessorInterfaces(IMSRegistrationforanUnauthenticatedUser)VisitedNetworkInternetHomeNetworkUserEquipmentVisitedCNVisitedIMSDNSServerHomeIMSHomeCNEventStudioSystemDesigner4.
024-Nov-0718:36(Page1)GPRSAttachGMMAttachRequestTheterminalpowersupandattachestotheGPRSnetwork.
GMMAttachAcceptGMMAttachCompletePDPContextActivationActivatePDPContextOncetheattachiscompleted,theterminalinitiatesaPDPcontextactivation.
ActivatePDPContextAcceptP-CSCFIPAddressTheterminalreceivesanIPaddressforthePDPcontext.
TheterminalalsoreceivestheIPaddressoftheP-CSCF.
TheP-CSCFservesastheinitialSIPproxyintotheIPMultimediaSystem(IMS).
UnauthenticatedIMSRegistrationAttemptREGISTERREGISTERsip:hims.
netSIP/2.
0,Via:SIP/2.
0/UDPUE-IP;branch=0abab,Route:sip:[P-CSCF-IP],Max-Forwards:20,From:;tag=abbb,To:,Contact:;expires=90000,Call-ID:ababab,CSeq:25REGISTER,Security-Client:port-s,port-c,Authorization:Digestusername=name.
private@hims.
net,Content-Length:0ThesubscribersendsaRegistermessagetoinformthenetworkthatthespecifieduserpublicidentify(myname@mynetwork.
com)isavailableattheIPaddressindicatedintheContactHeader.
TheUserEquipment(UE)alsoaddsaviaheadertorecordthatthemessagehadtraversedtheUE.
TheREGISTERmessagealsoincludestheserverandclientports.
NotethatthemessageitselfissentonthestandardSIPport5060.
TheSIPREGISTERmessagealsoincludestheprivateidentityoftheuser.
ThisidentitywillbeusedbytheS-CSCFandHSStoidentifytheuser.
DNSQuerydomain=hims.
netTheP-CSCFreceivestheREGISTERmessageandusestheDNStotranslatefromthedomainhims.
nettotheIPaddressofthehomenetwork.
DNSResponseip=ICSCF-IPREGISTERREGISTERsip:hims.
netSIP/2.
0,Via:SIP/2.
0/UDPpcscf1.
vims.
net;branch=0aab1,Via:SIP/2.
0/UDPUE-IP;branch=0abab,Max-Forwards:19,From:;tag=abbb,To:,Contact:;expires=90000,Call-ID:ababab,CSeq:25REGISTER,Content-Length:0,Authorization:Digestusername=name.
private@hims.
netintegrityprotection:noP-CSCFaddsaViaheaderandremovestheRouteheader.
TheREGISTERmessagewillberoutedtotheIPaddressobtainedfromtheDNSresponse.
Notethattheintegrityprotectionflagissettofalsetosignifythattheuserhasnotbeenauthenticated.
UserAuthorizationRequestname.
private@hims.
netQuerytheHSStoassigntheS-CSCF.
UserAuthorizationAnswerS-CSCFName,S-CSCFCapabilitiesHSSreplieswiththeS-CSCFs.
MultimediaAuthenticationRequestname.
private@hims.
netMultimediaAuthenticationAnswerRAND,AUTN,XRES,CK,IKHSSpassestheRandomnumber(RAND),Authenticationtoken(AUT),signedresult(XRES),Cipherkey(CK)andIntegrityKey(IK).
401UnauthorizedWWW-Authenticate:nonce=RAND-AUTN,ck,ik,Via:pcscf1,ue-ipPassthemessagetotheP-CSCF.
CKandIKarecarriedintheWWW-Authenticateheader.
401UnauthorizedWWW-Authenticate:nonce=RAND-AUTN,Security-Server:port-s,port-cPasstheRANDandAUTNvaluestothesubscriber.
TheCKandIKareremovedfromtheWWW-Authenticateheader.
TheP-CSCFsideclientandserverportsarealsoincludedinthemessage.
ThemessageitselfissentonthestandardSIPport5060.
ProcessorInterfaces(IMSRegistrationforanUnauthenticatedUser)VisitedNetworkInternetHomeNetworkUserEquipmentVisitedCNVisitedIMSDNSServerHomeIMSHomeCNEventStudioSystemDesigner4.
024-Nov-0718:36(Page2)IPSecSecurityAssociationEstablishmentIPSecSAforUEInitiatedRequestsUE-Client->P-CSCF-ServerEstablishIPSecsecurityassociationsforalltheclientandserverports.
IPSecSAforResponsestoUEUE-ServerP-CSCF-ServerAuthenticatedIMSRegistrationREGISTERVia:UE-IP;UE-Server-Port,Route:pcscf1,pcscf-server-port,Contact:UE-IPue-server-port,Authorization:Digestusername=name.
private@hims.
netresponse=RESTheSubscriberhasnowestablishedtheIPSecsecurityassociationswiththeP-CSCF.
Atthispoint,theSIPREGISTERmessageissentagain.
ThistimethemessageisprotectedbyIPSecandthemessageisaddressedtotheP-CSCFserverportpassedinthe401Unauthorizedmessage.
ThemessagecontainstheRESintheAuthorizationheader.
REGISTERVia:pcscf1UE-IP;UE-Server-Port,Contact:UE-IPue-server-port,Authorization:Digestusername=name.
private@hims.
netresponse=RESintegrityprotection:yes,RESPasstheREGISTERmessagetotheI-CSCF.
ThistimetheAuthorizationheaderindicatesthatintegrityprotectionisenabled.
UserAuthorizationRequestname.
private@hims.
netQuerytheHSStoassigntheS-CSCF.
UserAuthorizationAnswerS-CSCFName,S-CSCFCapabilitiesHSSreplieswiththeS-CSCFs.
ServerAssignmentRequestname.
private@hims.
netRequestsubscriberrelatedinformationfromtheHSS.
ServerAssignmentAnswerReceivedsubscriberrelatedinformation.
200OKVia:pcscf1,UE-IP;UE-Server-PortThesuccessisrelayedbacktotheP-CSCF.
200OKVia:UE-IP;UE-Server-PortTheIMSregistrationoftheuserisnowcomplete.