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
DediPath（$1.40），OpenVZ架构 1GB内存
DediPath 商家成立时间也不过三五年，商家提供的云服务器产品有包括KVM和OPENVZ架构的VPS主机。翻看前面的文章有几次提到这个商家其中机房还是比较多的。其实对于OPENVZ架构的VPS主机以前我们是遇到比较多，只不过这几年很多商家都陆续的全部用KVM和XEN架构替代。这次DediPath商家有基于OPENVZ架构提供低价的VPS主机。这次四折的促销活动不包括512MB内存方案。第一、D...
百驰云（19/月），高性能服务器，香港三网CN2 2核2G 10M 国内、香港、美国、日本、VPS、物理机、站群全站7.5折，无理由退换，IP免费换！
百驰云成立于2017年，是一家新国人IDC商家，且正规持证IDC/ISP/CDN，商家主要提供数据中心基础服务、互联网业务解决方案，及专属服务器租用、云服务器、云虚拟主机、专属服务器托管、带宽租用等产品和服务。百驰云提供源自大陆、香港、韩国和美国等地骨干级机房优质资源，包括BGP国际多线网络，CN2点对点直连带宽以及国际顶尖品牌硬件。专注为个人开发者用户,中小型,大型企业用户提供一站式核心网络云端...
ZoeCloud：香港BGP云服务器,1GB内存/20GB SSD空间/2TB流量/500Mbps/KVM,32元/月
zoecloud怎么样?zoecloud是一家国人商家，5月成立，暂时主要提供香港BGP KVM VPS，线路为AS41378，并有首发永久8折优惠：HKBGP20OFF。目前，解锁香港区 Netflix、Youtube Premium ，但不保证一直解锁，谢绝以不是原生 IP 理由退款。不保证中国大陆连接速度，建议移动中转使用，配合广州移动食用效果更佳。点击进入：zoecloud官方网站地址zo...
internalservererror为你推荐
-
apple.com.cnwww.apple.com.cn是苹果官方网站吗？企业推广最常见的推广方式有哪些企业ssl证书公司购买SSL证书需要提交什么资料？一般要多久才能拿到证书重庆电信断网重庆电信的最近是怎么回事啊！老断网internetexplorer无法打开internet explorer网页打不开重庆电信dns重庆的DNS服务器地址是多少?360防火墙在哪里电脑或电脑360有联网防火墙吗，在哪里设置解析cuteftpyixingjia合家欢是一种什么东西？三友网三友联众集团怎么样？