defaultinternalservererror
internalservererror 时间:2021-04-12 阅读:()
NATTCPSIPALGSupportTheNATTCPSIPALGSupportfeatureallowsembeddedmessagesoftheSessionInitiationProtocol(SIP)passingthroughadevicethatisconfiguredwithNetworkAddressTranslation(NAT)tobetranslatedandencodedbacktothepacket.
Anapplication-layergateway(ALG)isusedwithNATtotranslatetheSIPorSessionDescriptionProtocol(SDP)messages.
ThismoduledescribestheNATTCPSIPALGSupportfeatureandexplainshowtoconfigureit.
FindingFeatureInformation,onpage1PrerequisitesforNATTCPSIPALGSupport,onpage1RestrictionsforNATTCPSIPALGSupport,onpage1InformationAboutNATTCPSIPALGSupport,onpage2HowtoConfigureNATTCPSIPALGSupport,onpage6ConfigurationExamplesforNATTCPSIPALGSupport,onpage7AdditionalReferenceforNATTCPSIPALGSupport,onpage7FeatureInformationforNATTCPSIPALGSupport,onpage8FindingFeatureInformationYoursoftwarereleasemaynotsupportallthefeaturesdocumentedinthismodule.
Forthelatestcaveatsandfeatureinformation,seeBugSearchToolandthereleasenotesforyourplatformandsoftwarerelease.
Tofindinformationaboutthefeaturesdocumentedinthismodule,andtoseealistofthereleasesinwhicheachfeatureissupported,seethefeatureinformationtable.
UseCiscoFeatureNavigatortofindinformationaboutplatformsupportandCiscosoftwareimagesupport.
ToaccessCiscoFeatureNavigator,gotowww.
cisco.
com/go/cfn.
AnaccountonCisco.
comisnotrequired.
PrerequisitesforNATTCPSIPALGSupportLayer4Forwarding(L4F)mustbeenabledforthefeaturetofunction.
RestrictionsforNATTCPSIPALGSupportNetworkAddressTranslation(NAT)translatesonlyembeddedIPv4addresses.
NATTCPSIPALGSupport1NATapplication-layergateway(ALG)fixupforSessionInitiationProtocol(SIP)messagesoverTCPisnotdonewhenLayer4Forwarding(L4F)functionalityisdisabled.
Inthiscase,SIPmessagesareconsideredasTCPmessagesandonlyLayer3andLayer4fixupsaredone.
AsperRFC5128,NATTCPSIPALGfeatureusesEndpoint-Independentmappingtoperformaddresstranslations.
ThiscombinationallowsincomingSIPtrafficfromanyexternalendpointonthepublicnetworktoamappedpublicport.
IfyoudonotneedEndpoint-Independentmapping,useACLorZone-basedPolicyFirewalltolimitthescopeofincomingtraffic.
InformationAboutNATTCPSIPALGSupportNATTCPSIPALGSupportOverviewTheNATTCPSIPALGSupportfeatureallowsembeddedmessagesoftheSessionInitiationProtocol(SIP)passingthroughadevicethatisconfiguredwithNetworkAddressTranslation(NAT)tobetranslatedandencodedbacktothepacket.
Anapplication-layergateway(ALG)isusedwithNATtotranslatetheSIPorSessionDescriptionProtocol(SDP)messages.
TheNATTCPSIPALGSupportfeatureaddsNATALGsupportforfixingupTCP-basedSIPmessages.
SessionInitiationProtocol(SIP)isanASCII-based,application-layercontrolprotocolthatcanbeusedtoestablish,maintain,andterminatecallsbetweentwoormoreendpoints.
SIPisaprotocoldevelopedbyIETFformultimediaconferencingoverIP.
SIPcanbeconfiguredtooperateoverTCP-basedtransports.
CiscoSIPimplementationenablessupportedCiscoplatformstosignalthesetupofvoiceandmultimediacallsoverIPnetworks.
SIPprovidesanalternativetoH.
323withintheVoIPinternetworkingsoftware.
LikeotherVoIPprotocols,SIPisdesignedtoaddressfunctionsofsignalingandsessionmanagementwithinapackettelephonynetwork.
Signalingallowscallinformationtobecarriedacrossnetworkboundaries.
Sessionmanagementprovidestheabilitytocontrolattributesofanend-to-endcall.
SessionDescriptionProtocol(SDP)isaprotocolthatdescribesmultimediasessions.
SDPcanbeusedinSIPmessagebodiestodescribemultimediasessionsusedforcreatingandcontrollingmultimediasessionswithtwoormoreparticipants.
SIPMessagesEntitiesthatarepresentinaSessionInitiationProtocol(SIP)deploymentcommunicatewitheachotherbyusingwell-definedSIPmessagesthattaketheformofrequestsandresponses.
TheseSIPmessagescancontainembeddedIPaddressorportinformationthatmightbelongtoaprivatedomain,andsuchmessagesmustbefixedupwhentheypassthroughaNetworkAddressTranslation(NAT)device.
FixupdenotesthewritingofthetranslatedIPaddressbackintothepacket.
Thisfixupisnormallyperformedbyanapplication-layergateway(alsocalledanapplication-levelgateway)(ALG)modulethatresidesontheNATdevice.
Bydefault,supportforSIPisenabledonthestandardTCPport5060toexchangeSIPmessages.
YoucanalsoconfigurenonstandardportsforSIPtooperate.
NATALGacceptsandattemptsfixupoperationsonallTCPsegmentsthatoriginatefromoraredestinedtotheconfiguredSIPport.
SIPmessageprocessinginvolvesperformingthefixupoperationonacompleteSIPmessage.
ATCPsegmentmaycarrymultipleSIPmessages.
ItisalsopossiblethataSIPmessageissegmentedandcarriedintwodifferentTCPsegments.
SIPmessagesaretextbased.
AnyadjustmentthatismadetothemessageaspartoftheALGfixupcanresultinthemessagetoincreaseordecreaseinsize.
AchangeinthemessagesizemeansthattheALGmustmakeNATTCPSIPALGSupport2NATTCPSIPALGSupportInformationAboutNATTCPSIPALGSupportadjustmentstotheTCPsequenceoracknowledgmentnumbersandkeeptrackofthesame.
TherearecaseswheretheALGmustperformspoofacknowledgmentsandcompleteTCPretransmission.
TCPproxyisanessentialcomponentthatterminatesaTCPconnectionpassingthroughNATALGandregeneratestheTCPconnection.
ThisconnectionallowsNATALGtomodifytheTCPpayloadwithoutanyTCPsessionhandlingissues.
ThetablebelowidentifiesthesixavailableSIPrequestmessages.
Table1:SIPRequestMessagesPurposeSIPMessageSentbycallingpartytoconfirmthereceiptofafinalresponsetoINVITE.
ACKSentbycallingpartyorcalledpartytoendacall.
BYESenttoendacallthathasnotyetbeenconnected.
CANCELRequestsentfromaUserAgentClient(UAC)toinitiateasession.
INVITESenttoquerycapabilitiesofUACsandnetworkservers.
OPTIONSSentbytheclienttoregistertheaddresswithaSIPproxy.
REGISTERThetablebelowidentifiestheavailableSIPresponsemethods.
Table2:SIPResponseMessagesPurposeSIPMessage100=Trying180=Ringing181=CallIsBeingForwarded182=Queued183=SessionProgress1xx(Informational)200=OK2xx(Successful)300=MultipleChoices301=MovedPermanently302=MovedTemporarily303=SeeOther305=UseProxy380=AlternativeService3xx(Redirection)NATTCPSIPALGSupport3NATTCPSIPALGSupportSIPMessagesPurposeSIPMessage400=BadRequest401=Unauthorized402=PaymentRequired403=Forbidden404=NotFound405=MethodNotAllowed406=NotAcceptable407=ProxyAuthenticationRequired408=RequestTimeout409=Conflict410=Gone411=LengthRequired413=RequestEntityTooLarge414=RequestURITooLarge415=UnsupportedMediaType420=BadExtension480=TemporarilyNotAvailable481=CallLeg/TransactionDoesNotExist482=LoopDetected483=TooManyHops484=AddressIncomplete485=Ambiguous486-BusyHere4xx(RequestFailure)500=InternalServerError501=NotImplemented502=BadGateway503=ServiceUnavailable504=GatewayTimeout505=SIPVersionNotSupported5xx(ServerFailure)NATTCPSIPALGSupport4NATTCPSIPALGSupportSIPMessagesPurposeSIPMessage600=BusyAnywhere603=Decline604=DoesNotExistAnywhere606=NotAcceptable6xx(GlobalFailure)SIPFunctionalityUsersinaSIPnetworkareidentifiedbyuniqueSIPaddresses.
ASIPaddressissimilartoane-mailaddressandisintheformatsip:userID@gateway.
com.
TheuserIDcanbeeitherausernameoranE.
164address.
Thegatewaycanbeeitheradomain(withorwithoutahostname)oraspecificinternetIPaddress.
AnE.
164addressisatelephonenumberwithastringofdecimaldigits,whichuniquelyindicatesthepublicnetworkterminationpoint.
Thisaddresscontainsallinformationthatisnecessarytorouteacalltoaterminationpoint.
NoteUsersregisterwitharegistrarserverusingtheirassignedSIPaddresses.
TheregistrarserverprovidesSIPaddressestothelocationserveronrequest.
Theregistrarserverprocessesrequestsfromuser-agentclients(UACs)forregistrationoftheircurrentlocations.
Whenauserinitiatesacall,aSIPrequestissenttoaSIPserver(eitheraproxyoraredirectserver).
Therequestincludestheaddressofthecaller(intheFromheaderfield)andtheaddressoftheintendedcalledparty(intheToheaderfield).
ASIPendusermightmovebetweenendsystems.
ThelocationoftheendusercanbedynamicallyregisteredwiththeSIPserver.
Thelocationservercanuseoneormoreprotocols(includingFinger,RWhois,andLightweightDirectoryAccessProtocol[LDAP])tolocatetheenduser.
Becausetheendusercanbeloggedinatmorethanonestationandthelocationservercansometimeshaveinaccurateinformation,thelocationservermightreturnmorethanoneaddressfortheenduser.
IftherequestiscomingthroughaSIPproxyserver,theproxyservertrieseachofthereturnedaddressesuntilitlocatestheenduser.
IftherequestiscomingthroughaSIPredirectserver,theredirectserverforwardsalltheaddressestothecalleravailableintheContactheaderfieldoftheinvitationresponse.
SIPFunctionalitywithaProxyServerAproxyserverreceivesSessionInitiationProtocol(SIP)requestsfromaclientandforwardsthemontheclient'sbehalf.
ProxyserversreceiveSIPmessagesandforwardthemtothenextSIPserverinthenetwork.
Proxyserverscanprovidefunctionssuchasauthentication,authorization,networkaccesscontrol,routing,reliablerequestretransmission,andsecurity.
SIPisapeer-to-peerprotocol.
Thepeersinasessionarecalleduseragents(UAs).
Whencommunicatingthroughaproxyserver,thecallerUAsendsanINVITErequesttotheproxyserverandthentheproxyserverdeterminesthepathandforwardstherequesttothecalledparty.
ThecalledUArespondstotheproxyserver,whichthenforwardstheresponsetothecaller.
Whenbothpartiesrespondwithanacknowledgment(SIPACKmessage),theproxyserverforwardstheacknowledgmentstotheirintendedpartyNATTCPSIPALGSupport5NATTCPSIPALGSupportSIPFunctionalityandasession,orconference,isestablishedbetweenthem.
TheReal-timeTransferProtocol(RTP)isthenusedforcommunicationacrosstheconnectionnowestablishedbetweenthecallerandcalledUA.
HowtoConfigureNATTCPSIPALGSupportSpecifyingaPortforNATTCPSIPALGSupportNetworkAddressTranslation(NAT)supportforSessionInitiationProtocol(SIP)isenabledbydefault.
SIPusesthedefaultTCPport5060toexchangemessages.
Ifrequired,youcanconfigureadifferentporttohandleSIPmessages.
SUMMARYSTEPS1.
enable2.
configureterminal3.
ipnatservicesiptcpportport-number4.
end5.
debugipnatsipDETAILEDSTEPSPurposeCommandorActionEnablesprivilegedEXECmode.
enableStep1Example:Enteryourpasswordifprompted.
Device>enableEntersglobalconfigurationmode.
configureterminalExample:Step2Device#configureterminalSpecifiesaportnumberotherthanthedefaultport.
ipnatservicesiptcpportport-numberExample:Step3Device(config)#ipnatservicesiptcpport8000ExitsglobalconfigurationmodeandreturnstoprivilegedEXECmode.
endExample:Step4Device(config)#endDisplaysSIPmessagesthatNATrecognizesandtheembeddedIPaddressescontainedinthosemessages.
debugipnatsipExample:Step5Device#debugipnatsipNATTCPSIPALGSupport6NATTCPSIPALGSupportHowtoConfigureNATTCPSIPALGSupportConfigurationExamplesforNATTCPSIPALGSupportExample:SpecifyingaPortforNATTCPSIPALGSupportThefollowingexampleshowshowtoconfigurethenonstandardport8000:Device(config)#ipnatservicesiptcpport8000Thefollowingissampleoutputfromthedebugipnatsipcommand:Device#debugipnatsipMay2314:11:17.
243IST:NAT-L4F:settingALG_NEEDEDflaginsubblockforSIPmessageMay2314:11:17.
243IST:NAT-ALG:lookup=0l7_bytes_recd=509appl_type=7May2314:11:17.
243IST:NAT-ALG:CompleteSIPMessageheaderofsize:376May2314:11:17.
243IST:NAT-ALG:Messagebodylength:133May2314:11:17.
243IST:NAT-ALG:TotalSIPmessagelength:509May2314:11:17.
243IST:NAT-ALG:afterstatemachine:May2314:11:17.
243IST:NAT-ALG:l7_bytes_recd=509May2314:11:17.
243IST:NAT-ALG:remaining_hdr_sz=0May2314:11:17.
243IST:NAT-ALG:remaining_payl_sz=0May2314:11:17.
243IST:NAT-ALG:tcp_alg_state=0May2314:11:17.
243IST:NAT-ALG:complete_msg_len=509May2314:11:17.
243IST:NAT-SIP-TCP:NumberofSIPmessagesreceived:1May2314:11:17.
243IST:NAT:SIP:[0]processingINVITEmessageMay2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]translatedembeddedaddress192.
168.
122.
3->10.
1.
1.
1May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]translatedembeddedaddress192.
168.
122.
3->10.
1.
1.
1May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:ContactheaderfoundMay2314:11:17.
243IST:NAT:SIP:TryingtofindexpiresparameterMay2314:11:17.
243IST:NAT:SIP:[0]translatedembeddedaddress192.
168.
122.
3->10.
1.
1.
1May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]messagebodyfoundMay2314:11:17.
243IST:NAT:SIP:MediaLinespresent:1May2314:11:17.
243IST:NAT:SIP:Translatedglobalm=(192.
168.
122.
3,6000)->(10.
1.
1.
1,6000)May2314:11:17.
243IST:NAT:SIP:old_sdp_len:133new_sdp_len:130May2314:11:17.
243IST:l4f_sendreturns497bytesMay2314:11:17.
243IST:CompletebufferwrittentoproxyAdditionalReferenceforNATTCPSIPALGSupportRelatedDocumentsDocumentTitleRelatedTopicCiscoIOSMasterCommandList,AllReleasesCiscoIOScommandsCiscoIOSIPAddressingServicesCommandReferenceNATcommandsNATTCPSIPALGSupport7NATTCPSIPALGSupportConfigurationExamplesforNATTCPSIPALGSupportStandardsandRFCsTitleStandard/RFCSIP:SessionInitiationProtocolRFC2543TechnicalAssistanceLinkDescriptionhttp://www.
cisco.
com/cisco/web/support/index.
htmlTheCiscoSupportandDocumentationwebsiteprovidesonlineresourcestodownloaddocumentation,software,andtools.
UsetheseresourcestoinstallandconfigurethesoftwareandtotroubleshootandresolvetechnicalissueswithCiscoproductsandtechnologies.
AccesstomosttoolsontheCiscoSupportandDocumentationwebsiterequiresaCisco.
comuserIDandpassword.
FeatureInformationforNATTCPSIPALGSupportThefollowingtableprovidesreleaseinformationaboutthefeatureorfeaturesdescribedinthismodule.
Thistablelistsonlythesoftwarereleasethatintroducedsupportforagivenfeatureinagivensoftwarereleasetrain.
Unlessnotedotherwise,subsequentreleasesofthatsoftwarereleasetrainalsosupportthatfeature.
UseCiscoFeatureNavigatortofindinformationaboutplatformsupportandCiscosoftwareimagesupport.
ToaccessCiscoFeatureNavigator,gotowww.
cisco.
com/go/cfn.
AnaccountonCisco.
comisnotrequired.
Table3:FeatureInformationforNATTCPSIPALGSupportFeatureInformationReleasesFeatureNameTheNATTCPSIPALGSupportfeatureallowsembeddedmessagesoftheSessionInitiationProtocol(SIP)passingthroughadevicethatisconfiguredwithNetworkAddressTranslation(NAT)tobetranslatedandencodedbacktothepacket.
Anapplication-layergateway(ALG)isusedwithNATtotranslatetheSIPorSessionDescriptionProtocol(SDP)messages.
15.
3(1)TNATTCPSIPALGSupportNATTCPSIPALGSupport8NATTCPSIPALGSupportFeatureInformationforNATTCPSIPALGSupport
Anapplication-layergateway(ALG)isusedwithNATtotranslatetheSIPorSessionDescriptionProtocol(SDP)messages.
ThismoduledescribestheNATTCPSIPALGSupportfeatureandexplainshowtoconfigureit.
FindingFeatureInformation,onpage1PrerequisitesforNATTCPSIPALGSupport,onpage1RestrictionsforNATTCPSIPALGSupport,onpage1InformationAboutNATTCPSIPALGSupport,onpage2HowtoConfigureNATTCPSIPALGSupport,onpage6ConfigurationExamplesforNATTCPSIPALGSupport,onpage7AdditionalReferenceforNATTCPSIPALGSupport,onpage7FeatureInformationforNATTCPSIPALGSupport,onpage8FindingFeatureInformationYoursoftwarereleasemaynotsupportallthefeaturesdocumentedinthismodule.
Forthelatestcaveatsandfeatureinformation,seeBugSearchToolandthereleasenotesforyourplatformandsoftwarerelease.
Tofindinformationaboutthefeaturesdocumentedinthismodule,andtoseealistofthereleasesinwhicheachfeatureissupported,seethefeatureinformationtable.
UseCiscoFeatureNavigatortofindinformationaboutplatformsupportandCiscosoftwareimagesupport.
ToaccessCiscoFeatureNavigator,gotowww.
cisco.
com/go/cfn.
AnaccountonCisco.
comisnotrequired.
PrerequisitesforNATTCPSIPALGSupportLayer4Forwarding(L4F)mustbeenabledforthefeaturetofunction.
RestrictionsforNATTCPSIPALGSupportNetworkAddressTranslation(NAT)translatesonlyembeddedIPv4addresses.
NATTCPSIPALGSupport1NATapplication-layergateway(ALG)fixupforSessionInitiationProtocol(SIP)messagesoverTCPisnotdonewhenLayer4Forwarding(L4F)functionalityisdisabled.
Inthiscase,SIPmessagesareconsideredasTCPmessagesandonlyLayer3andLayer4fixupsaredone.
AsperRFC5128,NATTCPSIPALGfeatureusesEndpoint-Independentmappingtoperformaddresstranslations.
ThiscombinationallowsincomingSIPtrafficfromanyexternalendpointonthepublicnetworktoamappedpublicport.
IfyoudonotneedEndpoint-Independentmapping,useACLorZone-basedPolicyFirewalltolimitthescopeofincomingtraffic.
InformationAboutNATTCPSIPALGSupportNATTCPSIPALGSupportOverviewTheNATTCPSIPALGSupportfeatureallowsembeddedmessagesoftheSessionInitiationProtocol(SIP)passingthroughadevicethatisconfiguredwithNetworkAddressTranslation(NAT)tobetranslatedandencodedbacktothepacket.
Anapplication-layergateway(ALG)isusedwithNATtotranslatetheSIPorSessionDescriptionProtocol(SDP)messages.
TheNATTCPSIPALGSupportfeatureaddsNATALGsupportforfixingupTCP-basedSIPmessages.
SessionInitiationProtocol(SIP)isanASCII-based,application-layercontrolprotocolthatcanbeusedtoestablish,maintain,andterminatecallsbetweentwoormoreendpoints.
SIPisaprotocoldevelopedbyIETFformultimediaconferencingoverIP.
SIPcanbeconfiguredtooperateoverTCP-basedtransports.
CiscoSIPimplementationenablessupportedCiscoplatformstosignalthesetupofvoiceandmultimediacallsoverIPnetworks.
SIPprovidesanalternativetoH.
323withintheVoIPinternetworkingsoftware.
LikeotherVoIPprotocols,SIPisdesignedtoaddressfunctionsofsignalingandsessionmanagementwithinapackettelephonynetwork.
Signalingallowscallinformationtobecarriedacrossnetworkboundaries.
Sessionmanagementprovidestheabilitytocontrolattributesofanend-to-endcall.
SessionDescriptionProtocol(SDP)isaprotocolthatdescribesmultimediasessions.
SDPcanbeusedinSIPmessagebodiestodescribemultimediasessionsusedforcreatingandcontrollingmultimediasessionswithtwoormoreparticipants.
SIPMessagesEntitiesthatarepresentinaSessionInitiationProtocol(SIP)deploymentcommunicatewitheachotherbyusingwell-definedSIPmessagesthattaketheformofrequestsandresponses.
TheseSIPmessagescancontainembeddedIPaddressorportinformationthatmightbelongtoaprivatedomain,andsuchmessagesmustbefixedupwhentheypassthroughaNetworkAddressTranslation(NAT)device.
FixupdenotesthewritingofthetranslatedIPaddressbackintothepacket.
Thisfixupisnormallyperformedbyanapplication-layergateway(alsocalledanapplication-levelgateway)(ALG)modulethatresidesontheNATdevice.
Bydefault,supportforSIPisenabledonthestandardTCPport5060toexchangeSIPmessages.
YoucanalsoconfigurenonstandardportsforSIPtooperate.
NATALGacceptsandattemptsfixupoperationsonallTCPsegmentsthatoriginatefromoraredestinedtotheconfiguredSIPport.
SIPmessageprocessinginvolvesperformingthefixupoperationonacompleteSIPmessage.
ATCPsegmentmaycarrymultipleSIPmessages.
ItisalsopossiblethataSIPmessageissegmentedandcarriedintwodifferentTCPsegments.
SIPmessagesaretextbased.
AnyadjustmentthatismadetothemessageaspartoftheALGfixupcanresultinthemessagetoincreaseordecreaseinsize.
AchangeinthemessagesizemeansthattheALGmustmakeNATTCPSIPALGSupport2NATTCPSIPALGSupportInformationAboutNATTCPSIPALGSupportadjustmentstotheTCPsequenceoracknowledgmentnumbersandkeeptrackofthesame.
TherearecaseswheretheALGmustperformspoofacknowledgmentsandcompleteTCPretransmission.
TCPproxyisanessentialcomponentthatterminatesaTCPconnectionpassingthroughNATALGandregeneratestheTCPconnection.
ThisconnectionallowsNATALGtomodifytheTCPpayloadwithoutanyTCPsessionhandlingissues.
ThetablebelowidentifiesthesixavailableSIPrequestmessages.
Table1:SIPRequestMessagesPurposeSIPMessageSentbycallingpartytoconfirmthereceiptofafinalresponsetoINVITE.
ACKSentbycallingpartyorcalledpartytoendacall.
BYESenttoendacallthathasnotyetbeenconnected.
CANCELRequestsentfromaUserAgentClient(UAC)toinitiateasession.
INVITESenttoquerycapabilitiesofUACsandnetworkservers.
OPTIONSSentbytheclienttoregistertheaddresswithaSIPproxy.
REGISTERThetablebelowidentifiestheavailableSIPresponsemethods.
Table2:SIPResponseMessagesPurposeSIPMessage100=Trying180=Ringing181=CallIsBeingForwarded182=Queued183=SessionProgress1xx(Informational)200=OK2xx(Successful)300=MultipleChoices301=MovedPermanently302=MovedTemporarily303=SeeOther305=UseProxy380=AlternativeService3xx(Redirection)NATTCPSIPALGSupport3NATTCPSIPALGSupportSIPMessagesPurposeSIPMessage400=BadRequest401=Unauthorized402=PaymentRequired403=Forbidden404=NotFound405=MethodNotAllowed406=NotAcceptable407=ProxyAuthenticationRequired408=RequestTimeout409=Conflict410=Gone411=LengthRequired413=RequestEntityTooLarge414=RequestURITooLarge415=UnsupportedMediaType420=BadExtension480=TemporarilyNotAvailable481=CallLeg/TransactionDoesNotExist482=LoopDetected483=TooManyHops484=AddressIncomplete485=Ambiguous486-BusyHere4xx(RequestFailure)500=InternalServerError501=NotImplemented502=BadGateway503=ServiceUnavailable504=GatewayTimeout505=SIPVersionNotSupported5xx(ServerFailure)NATTCPSIPALGSupport4NATTCPSIPALGSupportSIPMessagesPurposeSIPMessage600=BusyAnywhere603=Decline604=DoesNotExistAnywhere606=NotAcceptable6xx(GlobalFailure)SIPFunctionalityUsersinaSIPnetworkareidentifiedbyuniqueSIPaddresses.
ASIPaddressissimilartoane-mailaddressandisintheformatsip:userID@gateway.
com.
TheuserIDcanbeeitherausernameoranE.
164address.
Thegatewaycanbeeitheradomain(withorwithoutahostname)oraspecificinternetIPaddress.
AnE.
164addressisatelephonenumberwithastringofdecimaldigits,whichuniquelyindicatesthepublicnetworkterminationpoint.
Thisaddresscontainsallinformationthatisnecessarytorouteacalltoaterminationpoint.
NoteUsersregisterwitharegistrarserverusingtheirassignedSIPaddresses.
TheregistrarserverprovidesSIPaddressestothelocationserveronrequest.
Theregistrarserverprocessesrequestsfromuser-agentclients(UACs)forregistrationoftheircurrentlocations.
Whenauserinitiatesacall,aSIPrequestissenttoaSIPserver(eitheraproxyoraredirectserver).
Therequestincludestheaddressofthecaller(intheFromheaderfield)andtheaddressoftheintendedcalledparty(intheToheaderfield).
ASIPendusermightmovebetweenendsystems.
ThelocationoftheendusercanbedynamicallyregisteredwiththeSIPserver.
Thelocationservercanuseoneormoreprotocols(includingFinger,RWhois,andLightweightDirectoryAccessProtocol[LDAP])tolocatetheenduser.
Becausetheendusercanbeloggedinatmorethanonestationandthelocationservercansometimeshaveinaccurateinformation,thelocationservermightreturnmorethanoneaddressfortheenduser.
IftherequestiscomingthroughaSIPproxyserver,theproxyservertrieseachofthereturnedaddressesuntilitlocatestheenduser.
IftherequestiscomingthroughaSIPredirectserver,theredirectserverforwardsalltheaddressestothecalleravailableintheContactheaderfieldoftheinvitationresponse.
SIPFunctionalitywithaProxyServerAproxyserverreceivesSessionInitiationProtocol(SIP)requestsfromaclientandforwardsthemontheclient'sbehalf.
ProxyserversreceiveSIPmessagesandforwardthemtothenextSIPserverinthenetwork.
Proxyserverscanprovidefunctionssuchasauthentication,authorization,networkaccesscontrol,routing,reliablerequestretransmission,andsecurity.
SIPisapeer-to-peerprotocol.
Thepeersinasessionarecalleduseragents(UAs).
Whencommunicatingthroughaproxyserver,thecallerUAsendsanINVITErequesttotheproxyserverandthentheproxyserverdeterminesthepathandforwardstherequesttothecalledparty.
ThecalledUArespondstotheproxyserver,whichthenforwardstheresponsetothecaller.
Whenbothpartiesrespondwithanacknowledgment(SIPACKmessage),theproxyserverforwardstheacknowledgmentstotheirintendedpartyNATTCPSIPALGSupport5NATTCPSIPALGSupportSIPFunctionalityandasession,orconference,isestablishedbetweenthem.
TheReal-timeTransferProtocol(RTP)isthenusedforcommunicationacrosstheconnectionnowestablishedbetweenthecallerandcalledUA.
HowtoConfigureNATTCPSIPALGSupportSpecifyingaPortforNATTCPSIPALGSupportNetworkAddressTranslation(NAT)supportforSessionInitiationProtocol(SIP)isenabledbydefault.
SIPusesthedefaultTCPport5060toexchangemessages.
Ifrequired,youcanconfigureadifferentporttohandleSIPmessages.
SUMMARYSTEPS1.
enable2.
configureterminal3.
ipnatservicesiptcpportport-number4.
end5.
debugipnatsipDETAILEDSTEPSPurposeCommandorActionEnablesprivilegedEXECmode.
enableStep1Example:Enteryourpasswordifprompted.
Device>enableEntersglobalconfigurationmode.
configureterminalExample:Step2Device#configureterminalSpecifiesaportnumberotherthanthedefaultport.
ipnatservicesiptcpportport-numberExample:Step3Device(config)#ipnatservicesiptcpport8000ExitsglobalconfigurationmodeandreturnstoprivilegedEXECmode.
endExample:Step4Device(config)#endDisplaysSIPmessagesthatNATrecognizesandtheembeddedIPaddressescontainedinthosemessages.
debugipnatsipExample:Step5Device#debugipnatsipNATTCPSIPALGSupport6NATTCPSIPALGSupportHowtoConfigureNATTCPSIPALGSupportConfigurationExamplesforNATTCPSIPALGSupportExample:SpecifyingaPortforNATTCPSIPALGSupportThefollowingexampleshowshowtoconfigurethenonstandardport8000:Device(config)#ipnatservicesiptcpport8000Thefollowingissampleoutputfromthedebugipnatsipcommand:Device#debugipnatsipMay2314:11:17.
243IST:NAT-L4F:settingALG_NEEDEDflaginsubblockforSIPmessageMay2314:11:17.
243IST:NAT-ALG:lookup=0l7_bytes_recd=509appl_type=7May2314:11:17.
243IST:NAT-ALG:CompleteSIPMessageheaderofsize:376May2314:11:17.
243IST:NAT-ALG:Messagebodylength:133May2314:11:17.
243IST:NAT-ALG:TotalSIPmessagelength:509May2314:11:17.
243IST:NAT-ALG:afterstatemachine:May2314:11:17.
243IST:NAT-ALG:l7_bytes_recd=509May2314:11:17.
243IST:NAT-ALG:remaining_hdr_sz=0May2314:11:17.
243IST:NAT-ALG:remaining_payl_sz=0May2314:11:17.
243IST:NAT-ALG:tcp_alg_state=0May2314:11:17.
243IST:NAT-ALG:complete_msg_len=509May2314:11:17.
243IST:NAT-SIP-TCP:NumberofSIPmessagesreceived:1May2314:11:17.
243IST:NAT:SIP:[0]processingINVITEmessageMay2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]translatedembeddedaddress192.
168.
122.
3->10.
1.
1.
1May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]translatedembeddedaddress192.
168.
122.
3->10.
1.
1.
1May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:ContactheaderfoundMay2314:11:17.
243IST:NAT:SIP:TryingtofindexpiresparameterMay2314:11:17.
243IST:NAT:SIP:[0]translatedembeddedaddress192.
168.
122.
3->10.
1.
1.
1May2314:11:17.
243IST:NAT:SIP:[0]register:0door_created:0May2314:11:17.
243IST:NAT:SIP:[0]messagebodyfoundMay2314:11:17.
243IST:NAT:SIP:MediaLinespresent:1May2314:11:17.
243IST:NAT:SIP:Translatedglobalm=(192.
168.
122.
3,6000)->(10.
1.
1.
1,6000)May2314:11:17.
243IST:NAT:SIP:old_sdp_len:133new_sdp_len:130May2314:11:17.
243IST:l4f_sendreturns497bytesMay2314:11:17.
243IST:CompletebufferwrittentoproxyAdditionalReferenceforNATTCPSIPALGSupportRelatedDocumentsDocumentTitleRelatedTopicCiscoIOSMasterCommandList,AllReleasesCiscoIOScommandsCiscoIOSIPAddressingServicesCommandReferenceNATcommandsNATTCPSIPALGSupport7NATTCPSIPALGSupportConfigurationExamplesforNATTCPSIPALGSupportStandardsandRFCsTitleStandard/RFCSIP:SessionInitiationProtocolRFC2543TechnicalAssistanceLinkDescriptionhttp://www.
cisco.
com/cisco/web/support/index.
htmlTheCiscoSupportandDocumentationwebsiteprovidesonlineresourcestodownloaddocumentation,software,andtools.
UsetheseresourcestoinstallandconfigurethesoftwareandtotroubleshootandresolvetechnicalissueswithCiscoproductsandtechnologies.
AccesstomosttoolsontheCiscoSupportandDocumentationwebsiterequiresaCisco.
comuserIDandpassword.
FeatureInformationforNATTCPSIPALGSupportThefollowingtableprovidesreleaseinformationaboutthefeatureorfeaturesdescribedinthismodule.
Thistablelistsonlythesoftwarereleasethatintroducedsupportforagivenfeatureinagivensoftwarereleasetrain.
Unlessnotedotherwise,subsequentreleasesofthatsoftwarereleasetrainalsosupportthatfeature.
UseCiscoFeatureNavigatortofindinformationaboutplatformsupportandCiscosoftwareimagesupport.
ToaccessCiscoFeatureNavigator,gotowww.
cisco.
com/go/cfn.
AnaccountonCisco.
comisnotrequired.
Table3:FeatureInformationforNATTCPSIPALGSupportFeatureInformationReleasesFeatureNameTheNATTCPSIPALGSupportfeatureallowsembeddedmessagesoftheSessionInitiationProtocol(SIP)passingthroughadevicethatisconfiguredwithNetworkAddressTranslation(NAT)tobetranslatedandencodedbacktothepacket.
Anapplication-layergateway(ALG)isusedwithNATtotranslatetheSIPorSessionDescriptionProtocol(SDP)messages.
15.
3(1)TNATTCPSIPALGSupportNATTCPSIPALGSupport8NATTCPSIPALGSupportFeatureInformationforNATTCPSIPALGSupport
- defaultinternalservererror相关文档
- Writeinternalservererror
- Myersinternalservererror
- increasedinternalservererror
- 参数internalservererror
- Agents_GetWin32Consoleinternalservererror
- wmbuser4internalservererror
Hostodo：4款便宜美国vps七折优惠低至$13/年;NVMe阵列1Gbps带宽,免费DirectAdmin授权
hostodo怎么样?快到了7月4日美国独立日，hostodo现在推出了VPS大促销活动，提供4款Hostodo美国独立日活动便宜VPS，相当于7折，低至$13/年，续费同价。Hostodo美国独立日活动结束时间不定，活动机售完即止。Hostodo商家支持加密数字货币、信用卡、PayPal、支付宝、银联等付款。Hostodo美国独立日活动VPS基于KVM虚拟，NVMe阵列，1Gbps带宽，自带一个...
热网互联33元/月,香港/日本/洛杉矶/韩国CN2高速线路云主机
热网互联怎么样?热网互联(hotiis)是随客云计算(Suike.Cloud)成立于2009年，增值电信业务经营许可证：B1-20203716)旗下平台。热网互联云主机是CN2高速回国线路，香港/日本/洛杉矶/韩国CN2高速线路云主机,最低33元/月;热网互联国内BGP高防服务器，香港服务器，日本服务器全线活动中，大量七五折来袭!点击进入：热网互联官方网站地址热网互联香港/日本/洛杉矶/韩国cn2...
博鳌云¥799/月,香港110Mbps(含10M CN2)大带宽独立服务器/E3/8G内存/240G/500G SSD或1T HDD
博鳌云是一家以海外互联网基础业务为主的高新技术企业，运营全球高品质数据中心业务。自2008年开始为用户提供服务，距今11年，在国人商家中来说非常老牌。致力于为中国用户提供域名注册（国外接口）、免费虚拟主机、香港虚拟主机、VPS云主机和香港、台湾、马来西亚等地服务器租用服务，各类网络应用解決方案等领域的专业网络数据服务。商家支持支付宝、微信、银行转账等付款方式。目前香港有一款特价独立服务器正在促销，...
internalservererror为你推荐
-
mediawikiMediaWiki的权限及设置开启javascript怎么在浏览器中启用JavaScript?中国企业在线用什么软件查找中国所有企业名称flashfxp注册码谁知道 FlashFXP.rar的注册码？滴滴估值500亿开滴滴怎么才能月入一万，平均一天400纯收入，求指点中国保健养猪网135保健养猪，135天可以出栏吗？最土团购程序你好，请问你有团购网的程序吗关闭评论抖音上购物后给卖家的评价怎么删除掉？谷歌新漏洞谷歌浏览器真的有沙箱吗?真的不中毒?qq挂件QQ免费挂件怎么用