您的位置：首页 > Web前端

SIP Call Transfer and Call Forwarding Supplementary Services(cisco)

2007-12-18 20:44 465 查看























TableOfContents

SIPCallTransferandCallForwardingSupplementaryServices
Contents

PrerequisitesforSIPCallTransferandCallForwardingSupplementaryServices

RestrictionsforSIPCallTransferandCallForwardingSupplementaryServices

InformationAboutSIPCallTransferandCallForwardingSupplementaryServices

SIPBlindCallTransferandCallForwardingTCLIVRScript

ReleaseLinkTrunkingonSIPGateways

SIPGatewayInitiationofCallTransfers

SIPCallForwarding

HowtoConfigureSIPCallTransferandCallForwardingSupplementaryServices

LoadingtheTCLIVRApplicationontheGateway

ConfiguringSIPCallTransferandCallForwardingonaPOTSDialPeer

ConfiguringSIPCallTransferandCallForwardingonaVoIPDialPeer

ConfiguringtheSIPCallTransferandCallForwardingSessionTarget

TroubleshootingTips

ConfiguringSIPReferandNotifyMessageSettings

ConfigurationExamplesforSIPCallTransferandCallForwardingSupplementaryServices

BlindCallTransferIllustrationExample

BlindCallTransferScenarioExample

OriginatingGatewayConfigurationExample

RecipientGatewayConfigurationExample

Final-RecipientConfigurationExample

AdditionalReferences

RelatedDocuments

Standards

MIBs

RFCs

TechnicalAssistance

CommandReference

retryrefer
showsip-uaretry
showsip-uastatistics
showsip-uatimers
timersrefer
Glossary

SIPCallTransferandCallForwardingSupplementaryServices

TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureintroducestheabilityofSessionInitiationProtocol(SIP)gatewaystoinitiateblind,orattended,calltransfers.ReleaseLinkTrunking(RLT)functionalityisalsoaddedwiththisfeature.WithRLT,SIPblindcalltransferscannowbetriggeredbychannel-associatedsignaling(CAS)trunksignaling.Finally,theSIPCallTransferandCallForwardingSupplementaryServicesfeatureimplementsSIPsupportofcallforwardingrequestsfromaCiscoIOSgateway.

Calltransferandcallforwardingcapabilitiesenableapplicationserviceproviders(ASPs)toprovidecalltransferandcallforwardingservicesinaccordancewithemergingSIPstandards.

FeatureSpecificationsfortheSIPCallTransferandCallForwardingSupplementaryServices

FeatureHistory
Release
Modification
12.2(11)YT
Thisfeaturewasintroduced.
SupportedPlatforms
Cisco1760,Cisco2610,Cisco2613,Cisco2610XM,Cisco2611XM,Cisco2620,Cisco2621,Cisco2620XM,Cisco2621XM,Cisco2650,Cisco2651,Cisco2650XM,Cisco2651XM,Cisco2691,Cisco3620,Cisco3640,Cisco3660,Cisco7200,CiscoAS5300,CiscoAS5350,CiscoAS5400,andCiscoAS5850

2610-2613;2620-2621;2650-2651;3620;3640;7200;AS5300;AS5350;AS5400;AS5800;AS5850

1760;2400;2610-2613;2610XM-2611XM;2620-2621;2620XM-2621XM;2650-2651;2650XM-2651XM;2691;3620;3640;3660;3725;3745;7200;7400;AS5300;AS5350;AS5400;AS5800;AS5850
DeterminingPlatformSupportThroughCiscoFeatureNavigator

CiscoIOSsoftwareispackagedinfeaturesetsthataresupportedonspecificplatforms.Togetupdatedinformationregardingplatformsupportforthisfeature,accessCiscoFeatureNavigator.CiscoFeatureNavigatordynamicallyupdatesthelistofsupportedplatformsasnewplatformsupportisaddedforthefeature.

CiscoFeatureNavigatorisaweb-basedtoolthatenablesyoutodeterminewhichCiscoIOSsoftwareimagessupportaspecificsetoffeaturesandwhichfeaturesaresupportedinaspecificCiscoIOSimage.Youcansearchbyfeatureorrelease.Underthereleasesection,youcancomparereleasessidebysidetodisplayboththefeaturesuniquetoeachsoftwarereleaseandthefeaturesincommon.

ToaccessCiscoFeatureNavigator,youmusthaveanaccountonCisco.com.Ifyouhaveforgottenorlostyouraccountinformation,sendablanke-mailtocco-locksmith@cisco.com.Anautomaticcheckwillverifythatyoure-mailaddressisregisteredwithCisco.com.Ifthecheckissuccessful,accountdetailswithanewrandompasswordwillbee-mailedtoyou.QualifieduserscanestablishanaccountonCisco.combyfollowingthedirectionsfoundatthisURL:

http://www.cisco.com/register

CiscoFeatureNavigatorisupdatedregularlywhenmajorCiscoIOSsoftwarereleasesandtechnologyreleasesoccur.Forthemostcurrentinformation,gototheCiscoFeatureNavigatorhomepageatthefollowingURL:

http://www.cisco.com/go/fn

AvailabilityofCiscoIOSSoftwareImages

PlatformsupportforparticularCiscoIOSsoftwarereleasesisdependentontheavailabilityofthesoftwareimagesforthoseplatforms.Softwareimagesforsomeplatformsmaybedeferred,delayed,orchangedwithoutpriornotice.ForupdatedinformationaboutplatformsupportandavailabilityofsoftwareimagesforeachCiscoIOSsoftwarerelease,refertotheonlinereleasenotesor,ifsupported,CiscoFeatureNavigator.

Contents

•

PrerequisitesforSIPCallTransferandCallForwardingSupplementaryServices

•

RestrictionsforSIPCallTransferandCallForwardingSupplementaryServices

•

InformationAboutSIPCallTransferandCallForwardingSupplementaryServices

•

HowtoConfigureSIPCallTransferandCallForwardingSupplementaryServices

•

ConfigurationExamplesforSIPCallTransferandCallForwardingSupplementaryServices

•

AdditionalReferences

•

CommandReference

•

Glossary

PrerequisitesforSIPCallTransferandCallForwardingSupplementaryServices

ThefollowingaregeneralprerequisitesforSIPdeployment:

•

EnsurethatyourCiscorouterhastheminimummemoryrequirements.

•

EnsurethatthegatewayhasvoicefunctionalitythatisconfigurableforSIP.

•

AswithallSIPcalltransfermethods,thedialpeersmustbeconfiguredforcorrectfunctioningoftheRefermethod.Seethe"ConfiguringSIPCallTransferandCallForwardingonaPOTSDialPeer"sectionforthecompleteconfigurationsteps.

LoadCiscoIOSRelease12.2(11)YToralaterrelease.

Configurehookflashsignaling.

WriteaToolCommandLanguage(TCL)InteractiveVoiceResponse(IVR)2.0scriptthatimplementsCiscoIOScalltransferandforwardsupplementaryservicesfunctionality.

RestrictionsforSIPCallTransferandCallForwardingSupplementaryServices

•

TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureissupportedonlythroughTCLIVR2.0andVoiceXMLapplications;itisnotsupportedforTCLIVR1.0applicationsortheDEFAULTsessionapplication.

•

AlthoughSIPCiscoIOSgatewayscurrentlysupportSIPURLsandTELURLs,theRefer-ToheaderandtheAlsoheadermustbeinSIPURLformattobevalid.TheTELURLformatcannotbeusedbecauseitdoesnotprovideahostportion,andwithoutone,thetriggeredInviterequestcannotberouted.

•

CiscoSIPcustomerpremiseequipment(CPE)suchas79xxandAnalogTelephoneAdaptors(ATAs)donotcurrentlysupportTELURLs.

•

TheRefer-ToandContactheadersarerequiredintheReferrequest.Theabsenceofeitherheaderresultsina4xxclassresponsetotheReferrequest.Also,theReferrequestmustcontainexactlyoneRefer-Toheader.MultipleRefer-Toheadersresultina4xxclassresponse.

•

TheReferred-ByheaderisrequiredinaReferrequest.Theabsenceofthisheaderresultsina4xxclassresponsetotheReferrequest.Also,theReferrequestmustcontainexactlyoneReferred-Byheader.MultipleReferred-Byheadersresultina4xxclassresponse.

•

OnlyRLTonCASoranalog(FXS)portsissupportedwithSIPcalltransfers.

•

TheCiscoAS5xxxplatformsdonotsupporthookflashdetectionforT1CAS.

•

SIPcallforwardingissupportedonlyone-phones—IPphonesthatarenotconfiguredonthegateway.FXS,FXO,T1,E1,andCASphonesarenotsupported.

•

InCiscoIOSRelease12.2(11)YT,whenSIPwithe-phonesisused,DTMFisnotsupported.Voicecanbeestablished,butDTMFcannotberelayedin-orout-of-band.Customscriptingisalsonecessaryfore-phonestoinitiatecallforwarding.Thestandardconfigurationslistedinthisdocumentworkonlywhenane-phoneistherecipientorfinal-recipient.

InformationAboutSIPCallTransferandCallForwardingSupplementaryServices

ToconfiguretheSIPCallTransferandCallForwardingSupplementaryServicesfeature,youmustunderstandthefollowingconcepts:

•

SIPBlindCallTransferandCallForwardingTCLIVRScript

•

ReleaseLinkTrunkingonSIPGateways

•

SIPGatewayInitiationofCallTransfers

•

SIPCallForwarding

SIPBlindCallTransferandCallForwardingTCLIVRScript

TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureimplementsSIPsupportofblind,orattended,calltransfersandcallforwardingrequestsfromaCiscoIOSgateway.Ablindtransferisoneinwhichthetransferringphoneconnectsthecallertoadestinationlinebeforeringbackbegins.Thisisdifferentfromaconsultativetransferinwhichoneofthetransferringpartieseitherconnectsthecallertoaringingphone(ringbackheard)orspeakswiththethirdpartybeforeconnectingthecallertothethirdparty.Blindtransfersareoftenpreferredbyautomateddevicesthatdonothavethecapabilitytomakeconsultationcalls.

Beforeimplementingblindtransferandcallforwarding,acustomTCLIVR2.0scriptmustbewrittenthatimplementscalltransferandcallforwardingfunctionality.TheTCLIVRscriptisresponsibleforreceivingthehookflashevent,providingdialtone,matchingagainstthedialplan,initiatingthecalltransfer,andreestablishingtheoriginalcallifthetransferattemptfails.ForinformationonwritingaTCLIVRscript,seetheTCLIVRAPIVersion2.0Programmer'sGuide.

WhentheTCLIVRscriptrunsontheCiscogateway,itcanrespondtorequeststoinitiateblindcalltransfer(transferwithoutconsultation)onaSIPcallleg.SIPcallforwardingone-phones(IPphonesthatarenotconfiguredonthegateway)isalsosupported.

ReleaseLinkTrunkingonSIPGateways

RLTfunctionalityhasbeenaddedtoCiscoIOSSIPgateways.WithRLTfunctionality,SIPcalltransfercannowbetriggeredbyCAStrunksignaling,whichthecustomTCLIVRapplicationcanmonitor.AfteraSIPcalltransferhastranspiredandtheCASinterfaceisnolongerrequired,theCASinterfacecanbereleased.

TheRLTfunctionalitycanbeusedtoinitiateblindtransfersonSIPgateways.BlindcalltransferusestheRefermethod.AfulldescriptionofblindtransferandthereferMethodcanbefoundin

CallTransferCapabilitiesUsingtheReferMethoddocumentation.

RLTandSIPCallTransfers

WiththeCiscoIOSSIPCallTransferandCallForwardingSupplementaryServicesfeature,calltransfercanbetriggeredbyCAStrunksignalingandthencapturedbythecustomTCLIVRscriptonagateway.Theprocessbeginswiththeoriginator(theSIPuseragentthatinitiatesthetransferorReferrequest)respondingwithadialtoneonceitreceivesthesignalorhookflashfromthePSTNcallleg.Theoriginatorthenpreparestoreceivedual-tonemultifrequency(DTMF)digitsthatidentifythefinal-recipient(theuseragentintroducedintoacallwiththerecipient).

OncethefirstDTMFdigitisreceived,thedialtoneisdiscontinued.DTMF-digitcollectionisnotcompleteduntila4-secondinterdigittimeoutoccursoranon-hookisreceivedonthatspecificCAStimeslot.CalltransferstartswhenDTMF-digitcollectionissuccessful.Ifdigitcollectionfails,forexampleifnotenoughDTMFdigitsorinvaliddigitsarecollected,theinitialcallisreestablished.

OncetheDTMFdigitsaresuccessfullycollected,thecustomTCLIVRscriptcaninitiatecalltransfer.SIPmessagingbeginswhenthetransferisinitiatedwiththeRefermethod.TheoriginatorsendsanInvitetotherecipient(theuseragentthatreceivestheReferrequestandistransferredtothefinal-recipient)toholdthecallandrequestthattherecipientnotreturnReal-TimeTransportProtocol(RTP)packetstotheoriginator.TheoriginatorthensendsaSIPReferrequesttotherecipienttostartthetransferprocess.Whentherecipientreceivestherequest,itreturnsa202Acceptedacknowledgementtotheoriginator.TheTCLIVRscriptrunbytheoriginatorcanthenreleasetheCAStrunkandclosetheprimarycall.SeeFigure1.

IftherecipientdoesnotsupporttheRefermethod,a501Notimplementedmessageisreturned.However,forbackwardcompatibilitypurposes,thecalltransferisautomaticallycontinuedwiththeBye/Alsomethod.TheoriginatorsendsaBye/AlsorequesttotherecipientandreleasestheCAStrunkwiththePSTNcallleg.Theprimarycallbetweentheoriginatorandtherecipientisclosedwhena200OKresponseisreceived.

Inallothercasesofcalltransferfailures,theprimarycallbetweentheoriginatorandtherecipientisimmediatelyshutdown.

Figure1CallTransferUsingtheReferMethod



SIPandTELURLsinCallTransfers

WhentheSIPcalltransferoriginatorcollectsDTMFdigitsfromtheCAStrunk,itattemptstofindadialpeer.Ifadialpeerisfound,thesessiontargetinthedialpeerisusedtoformulateaSessionInitiationProtocolUniformResourceLocator(SIPURL).ThisURLcanbeusedwithboththeRefermethodandtheBye/Alsomethod.ASIPURLisinthefollowingform:

sip:JohnSmith@somewhere.com




Ifavaliddialpeerisnotfound,aTelephoneUniformResourceLocator(TELURL)isformulatedintheRefer-Toheader.ATELURLisinthefollowingform:

tel:+11231234567




ThechoiceofwhichURLtouseiscriticalwhencorrectlyroutingSIPcalls.Forexample,theoriginatinggatewaycansendoutaByewithanAlsoheader,buttheAlsoheadercancarryonlyaSIPURL.ItcannotcarryaTELURL.Thatis,ifthegatewaydecidestosendaBye/Alsobutcannotfindamatcheddialpeer,thegatewayreportsanerroronthetransfergatewayandsendsaByewithouttheAlsoheader.

IftherecipientofaSIPcalltransferisaSIPphone,thephonemusthavethecapabilitytointerpreteithertheRefermethodortheBye/Alsomethodforthecalltransfertowork.IftherecipientisaCiscoIOSgateway,thereneedstobeamatchingdialpeerfortheRefer-Touser.User,lookingatthepreviousexample,canbeeitherJohnSmithor11231234567.Thedialpeeralsoneedstohaveanapplicationsessiondefined,wheresessioncanbethenameofaTCLIVRapplication.Ifthere'snomatch,a4xxerrorissentbackandnotransferoccurs.Ifthere'saPOTSdialpeermatch,acallismadetothatPOTSphone.Beforethe12.2(11)YTrelease,ifthere'saVoIPmatch,theRefer-ToURLisusedtoinitiateaSIPcall.Inrelease12.2(11)YTandlater,theapplicationsessiontargetinthedialpeerisusedfortheSIPcall.See"ConfiguringSIPCallTransferandCallForwardingonaPOTSDialPeer"sectionforinformationontheapplicationsessiontarget.

SIPGatewayInitiationofCallTransfers
TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureintroducestheabilityofSIPgatewaystoinitiate,ororiginate,attendedcalltransfers.Theprocessbeginswhentheoriginatorestablishesacallwiththerecipient.WhentheuseronthePSTNcalllegwantstotransferthecall,theuseruseshookflashtogetaseconddialtoneandthenentersthefinal-recipientsnumber.TheTCLIVRscriptcanthenputtheoriginalcallonholdandsetupthecalltothefinal-recipient,makingtheoriginatoractivewiththefinal-recipient.TheReferrequestissentoutwhentheuserhangsuptotransferthecall.TheReferrequestcontainsaReplacesheaderthatcontainsthreetags:SIPCallID,from,andto.ThetagsarepassedalongintheInvitefromtherecipienttothefinal-recipient,givingthefinal-recipientadequateinformationtoreplacethecallleg.ThehostportionoftheReferrequestisbuiltfromtheestablishedinitialcall.ThefollowingisanexampleofaReferrequestthatcontainsaReplacesheader:



Note

IPaddressesandhostnamesinexamplesarefictitious.

Refersip:3100801@172.16.190.100:5060;user=phoneSIP/2.0


Via:SIP/2.0/UDP172.16.190.99:5060


From:"5555555"<sip:5555555@172.16.190.187>


To:<sip:3100801@172.16.190.187>;tag=A7C2C-1E8C


Date:Sat,01Jan200005:15:06GMT


Call-ID:c2943000-106ae5-1c5f-3428@172.16.197.182


User-Agent:Cisco-SIPGateway/IOS-12.x


Max-Forwards:6


Timestamp:946685709


CSeq:103Refer


Refer-To:sip:3100802@10.102.17.217?Replaces=DD713380-339C11CC-80BCF308-92BA812C@172.16.195.77;to-tag=A5438-23E4;from-tag=C9122EDB-2408


Referred-By:<sip:3100802@172.16.190.99>


Content-Length:0




OncetheNOTIFYisreceivedbytheoriginator,theTCLIVRscriptcandisconnectthecallbetweenoriginatorandrecipient.Thecallbetweentheoriginatorandfinal-recipientisdisconnectedbytherecipientsendingaBYEtotheoriginator.SeeFigure2foracallflowofasuccessfulcalltransfer.

Figure2SuccessfulAttendedCallTransferInitiatedbytheOriginator



IftherecipientdoesnotsupporttheRefermethod,a501Notimplementedmessageisreturned.

Inallothercasesofcalltransferfailures,theprimarycallbetweentheoriginatorandtherecipientisimmediatelyshutdown.Figure3showstherecipienthangingupthecallbeforethetransfercompletes.TheitemtonoticeisthattheNOTIFYmessageisneversent.

Figure3UnsuccessfulCallTransfer—RecipientHangsUpBeforeTransferCompletes



SIPCallForwarding
SIPcallforwardingissupportedonlyone-phones—IPphonesthatarenotconfiguredonthegateway.FXS,FXO,T1,E1,andCASphonesarenotsupported.

Withe-phones,therearefourdifferenttypesofSIPcallforwardingsupported:

•

CallForwardUnavailable

•

CallForwardNoAnswer

•

CallForwardBusy

•

CallForwardUnconditional

Inallfourofthesecallforwardingtypes,a302MovedTemporarilyresponseissenttotheuseragentclient.ADiversionheaderincludedinthe302responseindicatesthetypeofforward.

The302responsealsoincludesaContactheader.TheContactheaderisgeneratedbythecallingnumberthatisprovidedbythecustomTCLIVRscript.The302responsealsoincludesthehostportionfoundinthedialpeerforthatcallingnumber.IfthecallingnumbercannotmatchaVoIPdial-peerorPOTSdial-peernumber,a503ServiceUnavailablemessageissent,exceptinthecaseoftheCallForwardNoAnswer.WithCallForwardNoAnswer,callforwardingisignored,thephonerings,andtheexpirestimerclearsthecallifthereisnoanswer.



Note

InCiscoIOSRelease12.2(11)YT,whenSIPwithe-phonesisused,DTMFisnotsupported.Voicecanbeestablished,butDTMFcannotberelayedin-orout-of-band.Customscriptingisalsonecessaryfore-phonestoinitiatecallforwarding.Thestandardconfigurationslistedinthisdocumentworkonlywhenane-phoneistherecipientorfinal-recipient.

HowtoConfigureSIPCallTransferandCallForwardingSupplementaryServices
Thissectioncontainsthefollowingprocedures.Eachprocedureisidentifiedaseitherrequiredoroptional.

•

LoadingtheTCLIVRApplicationontheGateway(required)

•

ConfiguringSIPCallTransferandCallForwardingonaPOTSDialPeer(required)

•

ConfiguringSIPCallTransferandCallForwardingonaVoIPDialPeer(required)

•

ConfiguringtheSIPCallTransferandCallForwardingSessionTarget(optional)

•

ConfiguringSIPReferandNotifyMessageSettings(required)

LoadingtheTCLIVRApplicationontheGateway
TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureimplementsSIPsupportofblind,orattended,calltransfersandcallforwardingrequestsfromaCiscoIOSgateway.Beforethesefeaturesareimplemented,acustomTCLIVR2.0scriptmustbeloadedonthegateway.

Prerequisites
WriteaTCLIVR2.0scriptthatimplementsCiscoIOScalltransferandcallforwardingsupplementaryservicesfunctionality.TheTCLIVRscriptisresponsibleforreceivingthehookflashevent,providingdialtone,matchingagainstthedialplan,initiatingthecalltransfer,andreestablishingtheoriginalcallifthetransferattemptfails.ForinformationonwritingaTCLIVRscript,seetheTCLIVRAPIVersion2.0Programmer'sGuide.

Restrictions
TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureissupportedonlythroughTCLIVR2.0andVoiceXMLapplications;itisnotsupportedforTCLIVR1.0applicationsortheDEFAULTsessionapplication.

SUMMARYSTEPS
1.

enable

2.

configure{terminal|memory|network}

3.

callapplicationvoiceapplication-namelocation

4.

callapplicationvoiceapplication-namelanguagenumberlanguage

5.

callapplicationvoiceapplication-nameset-locationlanguagecategorylocation

6.

exit

7.

callapplicationvoiceloadapplication-name

DETAILEDSTEPS
CommandorAction
Purpose
Step1
enable

Example:

Router>enable
Enableshigherprivilegelevels,suchasprivilegedEXECmode.

•

Enteryourpasswordifprompted.
Step2
configure{terminal|memory|network}

Example:

Router#configureterminal
Entersglobalconfigurationmode.
Step3
callapplicationvoiceapplication-namelocation


Example:

Router(config)#callapplicationvoicetransfer_appflash:app_h450_transfer.tcl
LoadstheTCLIVRscriptandspecifiesitsapplicationname.

•

application-name—Nameusedtoreferencethecallapplication.Thisisauser-definednameanddoesnothavetomatchthedocumentname.

•

location—ThelocationoftheTCLIVRfileinURLformat.Forexample,Flashmemory(flash:filename),TFTP(tftp://../filename)orHTTPserverpaths(http://../filename)arevalidlocations.
Step4
callapplicationvoiceapplication-namelanguagenumberlanguage


Example:

Router(config)#callapplicationvoicetransfer_applanguage1en

(Optional)Setsthelanguagefordynamicpromptsusedbytheapplication.

•

application-name—NameoftheTCLIVRapplicationtowhichthelanguageparametersarebeingpassed.

•

language—Definesthelanguageoftheassociatedaudiofile.Validentriesareasfollows:

–

en—English

–

sp—Spanish

–

ch—Mandarin

–

aa—All

•

number—NumberthatidentifiesthelanguageusedbytheaudiofilesfortheIVRapplication.
Step5
callapplicationvoiceapplication-nameset-locationlanguagecategorylocation


Example:

Router(config)#callapplicationvoicetransfer_appset-locationen0flash:/prompts

(Optional)Definesthelocationandcategoryoftheaudiofilesthatareusedbytheapplicationfordynamicprompts.

•

application-name—NameoftheTCLIVRapplication.

•

language—Definesthelanguageoftheassociatedaudiofile.Validentriesareasfollows:

–

en—English

–

sp—Spanish

–

ch—Mandarin

–

aa—All

•

category—Categorygroup(0to4)fortheaudiofilesfromthislocation.Forexample,audiofilesforthedaysandmonthscouldbecategory1,audiofilesforunitsofcurrencycouldbecategory2,andaudiofilesforunitsoftime-(seconds,minutes,andhours)couldbecategory3.Thevalue0meansallcategories.

•

location—URLofthedirectorythatcontainsthelanguageaudiofilesusedbytheapplication,withoutfilenames.Forexample,Flashmemory(flash)oradirectoryonaserver(TFTP,HTTP,orRTSP)arevalidlocations.
Step6
exit


Example:

Router(config)#exit

ExitsglobalconfigurationmodeandreturnstoprivilegedEXECmode.
Step7
callapplicationvoiceloadapplication-name


Example:

Router#callapplicationvoiceloadtransfer.app
(Optional)ReloadstheTCLscriptafterithasbeenmodified.

•

application-name—NameoftheTCLIVRapplicationtoreload.
ConfiguringSIPCallTransferandCallForwardingonaPOTSDialPeer
Tohandleallcalltransferandcallforwardingsituations,youshouldconfigurebothPOTSandVoIPdialpeers.ThistaskconfiguresSIPcalltransferandcallforwardingforaPOTSdialpeer.

ToconfigureSIPcalltransferandforwardingonaCiscoIOSgatewayusingtheCAStrunkrefertothe"ConfiguringCAS"sectionoftheCiscoIOSDialTechnologiesConfigurationGuide,Release12.2.

Restrictions
•

TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureissupportedonlythroughTCLIVR2.0andVoiceXMLapplications;itisnotsupportedforTCLIVR1.0applicationsortheDEFAULTsessionapplication.

•

OnlyRLTonCASoranalog(FXS)portsissupportedwithSIPcalltransfers.

•

TheCiscoAS5xxxplatformsdonotsupporthookflashdetectionforT1CAS.

•

SIPcallforwardingissupportedonlyone-phones—IPphonesthatarenotconfiguredonthegateway.FXSandCASphonesarenotsupported.

•

InCiscoIOSRelease12.2(11)YT,whenSIPwithe-phonesisused,DTMFisnotsupported.Voicecanbeestablished,butDTMFcannotberelayedin-orout-of-band.Customscriptingisalsonecessaryfore-phonestoinitiatecallforwarding.Thestandardconfigurationslistedinthisdocumentworkonlywhenane-phoneistherecipientorfinal-recipient.

SUMMARYSTEPS
1.

enable

2.

configure{terminal|memory|network}

3.

dial-peervoicetag{pots|voip|mmoip|vofr|voatm}

4.

applicationapplication-name

5.

destination-pattern[+]string[T]

6.

portport

DETAILEDSTEPS
CommandorAction
Purpose
Step1
enable

Example:

Router>enable
Enableshigherprivilegelevels,suchasprivilegedEXECmode.

Enteryourpasswordifprompted.
Step2
configure{terminal|memory|network}

Example:

Router#configureterminal
Entersglobalconfigurationmode.
Step3
dial-peervoicetag{pots|voip
|mmoip
|
vofr|voatm}

Example:

Router(config)#dial-peervoice25pots
Entersdial-peerconfigurationmode.Thetagvalueisatagthatuniquelyidentifiesthedialpeer.(Thisnumberhaslocalsignificanceonly.)

Thefollowingkeywordcanbeusedforconfiguringcalltransfer:

•

pots—IndicatesthatthisisaVoIPpeerusingvoiceencapsulationontheplainoldtelephoneservice(POTS)network.
Step4
applicationapplication-name

Example:

Router(config-dial-peer)#applicationtransfer_app
LoadstheTCLIVRscriptspecifiedinthesection:"LoadingtheTCLIVRApplicationontheGateway"section.
Step5
destination-pattern[+]string[T]

Example:

Router(config-dial-peer)#destination-pattern7777
DefinestheprefixorthetelephonenumberassociatedwiththisPOTSdialpeer.

•

+—(Optional)CharacterindicatinganE.164standardnumber.

•

string—SeriesofdigitsthatspecifytheE.164orprivatedialingplantelephonenumber.Validentriesarethedigits0through9,thelettersAthroughD,andanyspecialcharacter.

•

T—(Optional)Controlcharacterindicatingthatthedestination-patternvalueisavariablelengthdialstring.
Step6
portport

Example:

Router(config-dial-peer)#port1/1/0
SpecifiesthevoiceslotnumberandlocalvoiceportthroughwhichincomingVoIPcallsarereceived.Tofindthecorrectdefinitionoftheportargumentforyourrouter,refertotheCiscoIOSVoice,Video,andFaxCommandReference,Release12.2T.
ConfiguringSIPCallTransferandCallForwardingonaVoIPDialPeer
Tohandleallcalltransferandcallforwardingsituations,youshouldconfigurebothPOTSandVoIPdialpeers.ThistaskconfiguresSIPcalltransferandcallforwardingforaVoIPdialpeer.

ToconfigureSIPcalltransferandforwardingonaCiscoIOSgatewayusingtheCAStrunkrefertothe"ConfiguringCAS"sectionoftheCiscoIOSDialTechnologiesConfigurationGuide,Release12.2.

Restrictions
•

TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureissupportedonlythroughTCLIVR2.0andVoiceXMLapplications;itisnotsupportedforTCLIVR1.0applicationsortheDEFAULTsessionapplication.

•

OnlyRLTonCASoranalog(FXS)portsissupportedwithSIPcalltransfers.

•

TheCiscoAS5xxxplatformsdonotsupporthookflashdetectionforT1CAS.

•

SIPcallforwardingissupportedonlyone-phones—IPphonesthatarenotconfiguredonthegateway.FXSandCASphonesarenotsupported.

•

InCiscoIOSRelease12.2(11)YT,whenSIPwithe-phonesisused,DTMFisnotsupported.Voicecanbeestablished,butDTMFcannotberelayedin-orout-of-band.Customscriptingisalsonecessaryfore-phonestoinitiatecallforwarding.Thestandardconfigurationslistedinthisdocumentworkonlywhenane-phoneistherecipientorfinal-recipient.

SUMMARYSTEPS
1.

enable

2.

configure{terminal|memory|network}

3.

dial-peervoicetag{pots|voip|mmoip|vofr|voatm}

4.

applicationapplication-name

5.

destination-pattern[+]string[T]

6.

sessiontargetipv4:destination-address

DETAILEDSTEPS
CommandorAction
Purpose
Step1
enable

Example:

Router>enable
Enableshigherprivilegelevels,suchasprivilegedEXECmode.

Enteryourpasswordifprompted.
Step2
configure{terminal|memory|network}

Example:

Router#configureterminal
Entersglobalconfigurationmode.
Step3
dial-peervoicetag{pots|voip
|mmoip
|
vofr|voatm}

Example:

Router(config)#dial-peervoice29voip
Entersdial-peerconfigurationmode.Thetagvalueisatagthatuniquelyidentifiesthedialpeer.(Thisnumberhaslocalsignificanceonly.)

Thefollowingkeywordcanbeusedforconfiguringcalltransfer:

•

voip—IndicatesthatthisisaVoIPpeerusingvoiceencapsulationontheplainoldtelephoneservice(POTS)network.
Step4
applicationapplication-name

Example:

Router(config-dial-peer)#applicationtransfer_app
LoadstheTCLIVRscriptspecifiedinthesection:"LoadingtheTCLIVRApplicationontheGateway"section.
Step5
destination-pattern[+]string[T]

Example:

Router(config-dial-peer)#destination-pattern7777
DefinestheprefixorthetelephonenumberassociatedwiththisVoIPdialpeer.

•

+—(Optional)CharacterthatindicatesanE.164standardnumber.

•

string—SeriesofdigitsthatspecifytheE.164orprivatedialingplantelephonenumber.Validentriesarethedigits0through9,thelettersAthroughD,andanyspecialcharacter.

•

T—(Optional)Controlcharacterindicatingthatthedestination-patternvalueisavariablelengthdialstring.
Step6
sessiontargetipv4:destination-address

Example:

Router(config-dial-peer)#sessiontargetipv4:172.18.200.21
Specifiesanetwork-specificaddressforadialpeer.

ipv4:destinationaddress:SetstheIPaddressofthedialpeer.AvalidIPaddressisinthisformat:xxx.xxx.xxx.xxx
ConfiguringtheSIPCallTransferandCallForwardingSessionTarget
ThistaskconfiguresaSIPserverasasessiontarget.Althoughitisnotrequired,configuringaSIPserverasasessiontargetisusefulifthereisaCiscoSIPproxyserver(CSPS)presentinthenetwork.WithaCSPS,youcanconfiguretheSIPserveroptionandhavetheinteresteddialpeersusetheCSPSbydefault.

Todeterminethecalltransferdestinationontheoriginator,checkifthereisamatchingdialpeer.Ifthereisamatchingdialpeer,checkthesessiontargetforthedialpeer.IfthesessiontargetisaSIPserver,configuretheSIPserverasdescribedinthetaskbelow.IfthesessiontargetisnotaSIPserver,thesessiontargetconfiguredintheVoIPdialpeerisused.

Ifthereisnodialpeerthatmatchesthedestinationpattern,aTELURLissent.

ToconfigureSIPcalltransferandforwardingonaCiscoIOSgatewayusingtheCAStrunkrefertothe"ConfiguringCAS"sectionoftheCiscoIOSDialTechnologiesConfigurationGuide,Release12.2.

SUMMARYSTEPS
1.

enable

2.

configure{terminal|memory|network}

3.

sip-ua

4.

sip-serverdns:host-name

5.

exit

6.

dial-peervoicenumbervoip

7.

destination-pattern[+]string[T]

8.

sessiontargetsip-server

DETAILEDSTEPS
CommandorAction
Purpose
Step1
enable

Example:

Router>enable
Enableshigherprivilegelevels,suchasprivilegedEXECmode.

Enteryourpasswordifprompted.
Step2
configure{terminal|memory|network}

Example:

Router#configureterminal
Entersglobalconfigurationmode.
Step3
sip-ua

Example:

Router(config)#sip-ua
EntersSIPuseragentconfigurationmode.
Step4
sip-serverdns:host-name

Example:

Router(config-sip-ua)#sip-serverdns:3660-2.sip.com
SetstheglobalSIPserverinterfacetoaDomainNameSystem(DNS)hostname.Ifyoudonotspecifyahostname,thedefaultDNSdefinedbytheipname-servercommandisused.
Step5
exit

Example:

Router(config-sip-ua)#exit
ExitsSIPuseragentconfigurationmode.
Step6
dial-peervoicetag{pots|voip
|mmoip
|
vofr|voatm}

Example:

Router(config)#dial-peervoice29voip
Entersdial-peerconfigurationmode.Thetagvalueisatagthatuniquelyidentifiesthedialpeer.(Thisnumberhaslocalsignificanceonly.)

Thefollowingkeywordcanbeusedforconfiguringcalltransfer:

•

voip—IndicatesthatthisisaVoIPpeerusingvoiceencapsulationontheplainoldtelephoneservice(POTS)network.
Step7
destination-pattern[+]string[T]

Example:

Router(config-dial-peer)#destination-pattern7777
DefinestheprefixorthetelephonenumberassociatedwiththisVoIPdialpeer.

•

+—(Optional)CharacterindicatinganE.164standardnumber.

•

string—SeriesofdigitsthatspecifytheE.164orprivatedialingplantelephonenumber.Validentriesarethedigits0through9,thelettersAthroughD,andanyspecialcharacter.

•

T—(Optional)Controlcharacterindicatingthatthedestination-patternvalueisavariablelengthdialstring.
Step8
sessiontargetsip-server

Example:

Router(config-dial-peer)#sessiontargetsip-server
InstructsthedialpeersessiontargettousetheglobalSIPserver.ThissavesrepeatedlyenteringtheSIPserverinterfaceaddressforeachdialpeer.
TroubleshootingTips
TotroubleshoottheSIPCallTransferandCallForwardingSupplementaryServicesfeature,usethefollowingcommands.

Command
Purpose
Router#showtelephony-servicee-phone-dn
DisplaystheCiscoIPphonedestinationnumberofthe
CiscoIOSTelephonyServicerouter.
Router#showtelephony-servicevoice-port
DisplaysoutputforthevoiceportsoftheCiscoIOSTelephonyServicerouter.
Router#showe-phone[mac-address]
DisplaystheCiscoIPphoneoutput.
Router#showe-phone-dntag
DisplaystheCiscoIPphonedestinationnumber.
Router#showe-phonesummary
DisplaysasummaryofallCiscoIPphones.
Router#showe-phone-dnsummary
DisplaysasummaryofallCiscoIPphonedestinationnumbers.
Router#showvoiceportsummary
Displaysasummaryofallvoiceports.
Router#showdial-peervoicesummary
Displaysasummaryofallvoicedialpeers.
ConfiguringSIPReferandNotifyMessageSettings
TheReferrequestisinitiatedbytheoriginatinggatewayandsignalsthestartofcalltransfer.OncetheoutcomeoftheSIPRefertransactionisknown,therecipientoftheReferrequestnotifiestheoriginatinggatewayoftheoutcomeoftheRefertransaction—whetherthefinal-recipientwassuccessfullyorunsuccessfullycontacted.ThenotificationisaccomplishedusingtheNotifymethod.

CompletethesestepstoconfiguretheReferrequestsettingsandtoconfiguretheNotifymethod.

Prerequisites
Customscriptingisnecessaryfore-phonestoinitiatecallforwarding.Thestandardconfigurationslistedinthisdocumentworkonlywhenane-phoneistherecipientorfinal-recipient.

Restrictions
•

TheSIPCallTransferandCallForwardingSupplementaryServicesfeatureissupportedonlythroughTCLIVR2.0andVoiceXMLapplications;itisnotsupportedforTCLIVR1.0applicationsortheDEFAULTsessionapplication.

•

OnlyRLTonCASoranalog(FXS)portsissupportedwithSIPcalltransfers.

•

TheCiscoAS5xxxplatformsdonotsupporthookflashdetectionforT1CAS.

•

SIPcallforwardingissupportedonlyone-phones—IPphonesthatarenotconfiguredonthegateway.FXSandCASphonesarenotsupported.

•

InCiscoIOSRelease12.2(11)YT,whenSIPwithe-phonesisused,DTMFisnotsupported.Voicecanbeestablished,butDTMFcannotberelayedin-orout-of-band.Customscriptingisalsonecessaryfore-phonestoinitiatecallforwarding.Thestandardconfigurationslistedinthisdocumentworkonlywhenane-phoneistherecipientorfinal-recipient.

•

AswithallSIPcalltransfermethods,thedialpeersmustbeconfiguredforcorrectfunctioningoftheRefermethod.Seethe"ConfiguringSIPCallTransferandCallForwardingonaPOTSDialPeer"sectionforthecompleteconfigurationsteps.



Note

Customscriptingisnecessaryfore-phonestoinitiatecallforwarding.Thestandardconfigurationslistedinthisdocumentworkonlywhenane-phoneistherecipientorfinal-recipient.

SUMMARYSTEPS
1.

enable

2.

configure{terminal|memory|network}

3.

sip-ua

4.

timersrefernumber

5.

retryrefernumber

6.

timersnotifynumber

7.

retrynotifynumber

8.

exit

DETAILEDSTEPS
CommandorAction
Purpose
Step1
enable

Example:

Router>enable
Enableshigherprivilegelevels,suchasprivilegedEXECmode.

Enteryourpasswordifprompted.
Step2
configure{terminal|memory|network}

Example:

Router#configureterminal
Entersglobalconfigurationmode.
Step3
sip-ua

Example:

Router(config)#sip-ua
EntersSIPuseragentconfigurationmode.
Step4
timersrefernumber

Example:

Router(config-sip-ua)#timersrefer500
SetshowlongtheSIPUAwaitsbeforeretransmittingaReferrequest.Thedefaulttimeis500milliseconds.
Step5
retryrefernumber

Example:

Router(config-sip-ua)#retryrefer10
SetsthenumberoftimestheReferrequestisretransmitted.Thedefaultis10.
Step6
timersnotifynumber

Example:

Router(config-sip-ua)#timersnotify500
SetshowlongtheSIPUAwaitsbeforeretransmittingtheNotifymessage.Thedefaulttimeis500milliseconds.
Step7
retrynotifynumber

Example:

Router(config-sip-ua)#retrynotify10
SetsthenumberoftimestheNotifymessageisretransmitted.Thedefaultis10.
Step8
exit

Example:

Router(config-sip-ua)#exit

ExitsSIPuseragentconfigurationmode.
TroubleshootingTips
ToverifyReferorNotifymessages,usethefollowingcommands

Command
Purpose
Router#showsip-uatimers
DisplaysthecurrentsettingsfortheSIPuser-agent(UA)timer.
Router#showsip-uaretry
DisplaysretrystatisticsfortheSIPUA.
Router#showsip-uastatistics
Displaysresponse,traffic,andretrystatisticsfortheSIPUA.
:

ConfigurationExamplesforSIPCallTransferandCallForwardingSupplementaryServices
Thissectionprovidesanend-to-endcalltransferconfigurationexample.

•

BlindCallTransferIllustrationExample

•

BlindCallTransferScenarioExample

•

OriginatingGatewayConfigurationExample

•

RecipientGatewayConfigurationExample

•

Final-RecipientConfigurationExample



Note

IPaddressesandhostnamesinexamplesarefictitious.

BlindCallTransferIllustrationExample


BlindCallTransferScenarioExample
1.

Theuserat(818)382-1111callstheuserat(717)372-1111,andtheyareinaconversation.

2.

Theuserat(717)372-1111decidestotransfertheuserat(818)382-1111totheuserat(616)362-1111.

Thetransfertakesplacebytheuserat(717)372-1111goingon-hookovertheCAStrunkanddialing(616)362-1111.

3.

Acalltransferisinitiatedfromtheoriginatinggatewaytotherecipientgateway,andtheoriginatorreleasestheCAStrunkto(717)372-1111.

4.

Therecipientgatewayreleasesthecalllegtotheoriginatorandinitiatesanewcalltothefinal-recipient—theuserat(616)362-1111.

5.

Thecalltransferiscomplete,andtheuserat(818)382-1111andtheuserat(616)362-1111areinaconversation.

OriginatingGatewayConfigurationExample
Router#showrunning-config




Buildingconfiguration...




Currentconfiguration:4192bytes


!


version12.2


serviceconfig


noservicesingle-slot-reload-enable


noservicepad


servicetimestampsdebuguptime


servicetimestampsloguptime


noservicepassword-encryption


serviceinternal


serviceudp-small-servers


!


voice-card2


!


ipsubnet-zero


!


controllerT12/0


framingesf


linecodeb8zs


ds0-group0timeslots1-24typee&m-wink-start


!


interfaceFastEthernet3/0


ipaddress172.18.200.36255.255.255.0


speed10


half-duplex


noshut


iprsvpbandwidth75007500


!


voice-port2/0:0


timinghookflash-in1500


!


callapplicationvoicesample_RLTtftp://rtplab-tftp1/liszt/dec18/sample_RLT.tcl


callapplicationvoicesample_RLTuid-len4


callapplicationvoicesample_RLTlanguage1en


callapplicationvoicesample_RLTset-locationen0tftp://rtplab-tftp1/liszt/TCLware_1_2_2/prompts/en/


!


dial-peervoice2voip


applicationsample_rlt


destination-pattern8183821111


sessionprotocolsipv2


sessiontargetipv4:172.18.200.24


codecg711ulaw


!


dial-peervoice3pots


destination-pattern7173721111


direct-inward-dial


port2/0:0


prefix7173721111


!


dial-peervoice3621111voip


applicationsample_rlt


destination-pattern6163621111


sessionprotocolsipv2


sessiontargetsip-server


codecg711ulaw


!


sip-ua


retrybye1


retryrefer3


timersnotify400


timersrefer567


nooli


sip-serveripv4:172.18.200.21


!


linecon0


lineaux0


linevty04


login


!


end


RecipientGatewayConfigurationExample
Router#showrunning-config




Buildingconfiguration...




Currentconfiguration:2791bytes


!


version12.2


serviceconfig


noservicesingle-slot-reload-enable


noservicepad


servicetimestampsdebuguptime


servicetimestampsloguptime


noservicepassword-encryption


serviceinternal


serviceudp-small-servers


!


interfaceFastEthernet2/0


ipaddress172.18.200.24255.255.255.0


duplexauto


noshut


speed10


iprsvpbandwidth75007500


!


voice-port1/1/1


nosupervisorydisconnectlcfo


!


dial-peervoice1pots


applicationsession


destination-pattern8183821111


port1/1/1


!


dial-peervoice3voip


applicationsession


destination-pattern7173721111


sessionprotocolsipv2


sessiontargetipv4:172.18.200.36


codecg711ulaw


!


dial-peervoice4voip


applicationsession


destination-pattern6163621111


sessionprotocolsipv2


sessiontargetipv4:172.18.200.33


codecg711ulaw


!


gateway


!


sip-ua


!


linecon0


lineaux0


linevty04


login


!


end


Final-RecipientConfigurationExample
Router#showrunning-config




!


version12.2


noparsercache


servicetimestampsdebuguptime


servicetimestampsloguptime


noservicepassword-encryption


serviceinternal


!


nologgingbuffered


!


clocktimezoneGMT0


aaanew-model


!


!


aaaauthenticationloginh323groupradius


aaaauthorizationexech323groupradius


aaaaccountingconnectionh323start-stopgroupradius


aaasession-idcommon


ipsubnet-zero


iptcppath-mtu-discovery


!


!


ipdomainnamecisco.com


ipdhcpsmart-relay


!


!


voiceclasscodec1


codecpreference2g711alaw


codecpreference3g711ulaw


codecpreference5g726r16


codecpreference6g726r24


codecpreference7g726r32


codecpreference8g723ar53


codecpreference9g723ar63


codecpreference10g729r8


!


!


interfaceEthernet0/0


ipaddress172.18.200.33255.255.255.0


noshut


half-duplex


iprsvpbandwidth75007500


!


voice-port1/1/1


nosupervisorydisconnectlcfo


!


voice-port1/0/1


!


voice-port1/1/0


!


voice-port1/1/1


!


dial-peervoice1pots


applicationsession


destination-pattern6163621111


port1/1/1


!


ipclassless


noiphttpserver


ippimbidir-enable


!


!


gateway


!


sip-ua


!


rtrresponder


!


linecon0


exec-timeout00


lineaux0


linevty04


passwordww


linevty515


!


!


end




AdditionalReferences
ForadditionalinformationrelatedtotheSIPCallTransferandCallForwardingSupplementaryServicesfeature,refertothefollowingreferences:

•

RelatedDocuments

•

Standards

•

MIBs

•

RFCs

•

TechnicalAssistance

RelatedDocuments
RelatedTopic
DocumentTitle
CiscoSIPFunctionality
CiscoIOSVoice,Video,andFaxConfigurationGuide,Release12.2

CiscoIOSVoice,Video,andFaxCommandReference,Release12.2T

SessionInitiationProtocol(SIP)forVoIP,Release12.2(8)T

SessionInitiationProtocolGatewayCallFlows,Release12.2(4)T

CallTransferCapabilitiesUsingtheReferMethod,Release12.2(8)T
CiscoIOSReferences
CiscoIOSDebugCommandReference,Release12.2

CiscoIOSIPConfigurationGuide,Release12.2

CiscoIOSIPCommandReference,Volume1of3:AddressingandServices,Release12.2

CiscoIOSIPCommandReference,Volume2of3:RoutingProtocols,Release12.2

CiscoIOSIPCommandReference,Volume3of3:Multicast,Release12.2

CiscoIOSDialTechnologiesConfigurationGuide,Release12.2
CiscoIOSTelephony
CiscoIOSTelephonyServiceV2.1:NewFeaturesforCiscoIOSRelease12.2(11)YT
CiscoVoiceXML
CiscoIOSTCLandVoiceXMLApplicationGuide
CiscoTCLIVRAPI
TCLIVRAPIVersion2.0Programmer'sGuide
Standards
Standards1
Title
ITU-TH.450.2
CalltransfersupplementaryserviceforH.323
ITU-TH.450.3
CalldiversionsupplementaryserviceforH.323
1Notallsupportedstandardsarelisted.
MIBs
MIBs1
MIBsLink
•

CISCO-SIP-UA-MIB
ToobtainlistsofsupportedMIBsbyplatformandCiscoIOSrelease,andtodownloadMIBmodules,gototheCiscoMIBwebsiteonCisco.comatthefollowingURL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
1NotallsupportedMIBsarelisted.
TolocateanddownloadMIBsforselectedplatforms,CiscoIOSreleases,andfeaturesets,useCiscoMIBLocatorfoundatthefollowingURL:

http://tools.cisco.com/ITDIT/MIBS/servlet/index

IfCiscoMIBLocatordoesnotsupporttheMIBinformationthatyouneed,youcanalsoobtainalistofsupportedMIBsanddownloadMIBsfromtheCiscoMIBspageatthefollowingURL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

ToaccessCiscoMIBLocator,youmusthaveanaccountonCisco.com.Ifyouhaveforgottenorlostyouraccountinformation,sendablanke-mailtocco-locksmith@cisco.com.Anautomaticcheckwillverifythatyoure-mailaddressisregisteredwithCisco.com.Ifthecheckissuccessful,accountdetailswithanewrandompasswordwillbee-mailedtoyou.QualifieduserscanestablishanaccountonCisco.combyfollowingthedirectionsfoundatthisURL:

http://www.cisco.com/register

RFCs
RFCs1
Title
RFC2543
SIP:SessionInitiationProtocol
1NotallsupportedRFCsarelisted.
TechnicalAssistance
Description
Link
TechnicalAssistanceCenter(TAC)homepage,containing30,000pagesofsearchabletechnicalcontent,includinglinkstoproducts,technologies,solutions,technicaltips,tools,andlotsmore.RegisteredCisco.comuserscanloginfromthispagetoaccessevenmorecontent.
http://www.cisco.com/public/support/tac/home.shtml
CommandReference
Thissectiondocumentsnewandmodifiedcommands.AllothercommandsusedwiththisfeaturearedocumentedintheCiscoIOSRelease12.2commandreferencepublications.

NewCommands

•

retryrefer

•

timersrefer

ModifiedCommands

•

showsip-uaretry

•

showsip-uastatistics

•

showsip-uatimers

retryrefer
ToconfigurethenumberoftimesthattheReferrequestisretransmitted,usetheretryrefercommandinSIPuser-agentconfigurationmode.Toresettothedefault,usethenoformofthiscommand.

retryrefernumber


noretryrefer


SyntaxDescription
number
NumberofReferrequestretries.Rangeisfrom1to10.Defaultis10.
Defaults
10retries

CommandModes
SIPuser-agentconfiguration

CommandHistory
Release
Modification
12.2(11)YT
Thiscommandwasintroduced.
UsageGuidelines
ASessionInitiationProtocol(SIP)Referrequestissentbytheoriginatinggatewaytothereceivinggatewayandinitiatescallforwardandcalltransfercapabilities.

Whenconfiguringtheretryrefercommand,usethedefaultnumberof10whenpossible.Lowervaluessuchas1canleadtoanincreasedchanceofthemessagenotbeingreceivedbythereceivinggateway.

Examples
ThefollowingexampleconfiguresaReferrequesttoberetransmitted10times:

Router(config)#sip-ua


Router(config-sip-ua)#retryrefer10


RelatedCommands
Command
Description
showsip-uaretry
DisplaystheSIPretryattempts.
showsip-uastatistics
Displaysresponse,traffic,timer,andretrystatistics.
showsip-uaretry
TodisplayretrystatisticsfortheSessionInitiationProtocol(SIP)useragent(UA),usetheshowsip-uaretrycommandinprivilegedEXECmode.

showsip-uaretry


SyntaxDescription
Thiscommandhasnoargumentsorkeywords.

CommandModes
PrivilegedEXEC

CommandHistory
Release
Modification
12.1(3)T
Thiscommandwasintroduced.
12.2(2)XB
Commandoutputwasenhancedtodisplaythefollowing:Reliableprovisionalresponses(PRACK/reliable1xx),Conditionsmet(COMET)responses,andNotifyresponses.
12.2(2)XB1
ThiscommandwasimplementedonCiscoAS5850universalgateways.
12.2(8)T
ThiscommandwasintegratedintoCiscoIOSRelease12.2(8)T.ThiscommandisnotsupportedontheCiscoAS5300,CiscoAS5350,CiscoAS5400,andCiscoAS5850platformsinthisrelease.

Forthepurposesofdisplay,thiscommandwasseparatedfromthegenericshowsip-uacommandfoundpreviouslyinthisreference.
12.2(11)YT
ThiscommandwassupportedinCiscoIOSRelease12.2(11)YT.CommandoutputwasenhancedtodisplayReferresponses.
UsageGuidelines
UsethiscommandtoverifySIPconfigurations.

Examples
Thefollowingissampleoutputfromtheshowsip-uaretrycommand.

Router#showsip-uaretry




SIPUARetryValues


inviteretrycount=6responseretrycount=1


byeretrycount=1cancelretrycount=1


prackretrycount=10cometretrycount=10


reliable1xxcount=6notifyretrycount=10


referretrycount=10




Table1describessignificantfieldsinthisoutput,inalphabeticalorder.

Table1showsip-uaretryFieldDescriptions

Field
Description
byeretrycount
NumberoftimesthataByerequestisretransmitted.
cancelretrycount
NumberoftimesthataCancelrequestisretransmitted.
cometretrycount
NumberoftimesthataCOMETrequestisretransmitted.
inviteretrycount
NumberoftimesthatanInviterequestisretransmitted.
notifyretrycount
NumberoftimesthataNotifymessageisretransmitted.
prackretrycount
NumberoftimesthataPRACKrequestisretransmitted.
referretrycount
NumberoftimesthataReferrequestisretransmitted.
reliable1xxcount
NumberoftimesthataReliable1xxrequestisretransmitted.
responseretrycount
NumberoftimesthataResponserequestisretransmitted.
SIPUARetryValues
FieldheaderforSIPUAretryvalues.
RelatedCommands
Command
Description
showsip-uastatistics
Displaysresponse,traffic,andretrySIPstatistics.
showsip-uatimers
DisplaysthecurrentsettingsforSIPUAtimers.
sip-ua
EnablestheSIPuser-agentconfigurationcommands.
showsip-uastatistics
Todisplayresponse,traffic,andretrystatisticsfortheSessionInitiationProtocol(SIP)useragent(UA),usetheshowsip-uastatisticscommandinprivilegedEXECmode.

showsip-uastatistics


SyntaxDescription
Thiscommandhasnoargumentsorkeywords.

CommandModes
PrivilegedEXEC

CommandHistory
Release
Modification
12.1(3)T
Thiscommandwasintroduced.
12.2(2)XA
ThiscommandwasimplementedontheCiscoAS5400andCiscoAS5350.
12.2(2)XB
Commandoutputwasenhancedtodisplaythefollowing:BadRequestcounter(400class)nowcountsMalformedViaentries,Reliableprovisionalresponses(PRACK/rel1xx),Conditionsmet(COMET),andNotifyresponses.
12.2(2)XB1
ThiscommandwasimplementedonCiscoAS5850universalgateways.
12.2(8)T
ThiscommandwasintegratedintoCiscoIOSRelease12.2(8)T.ThiscommandisnotsupportedontheCiscoAS5300,CiscoAS5350,CiscoAS5400,andCiscoAS5850platformsinthisrelease.

Forthepurposesofdisplay,thiscommandwasseparatedfromthegenericshowsip-uacommandfoundpreviouslyinthisreference.
12.2(11)T
ThiscommandwassupportedinCiscoIOSRelease12.2(11)T.Commandoutputwasenhancedasfollows:

•

OkInfocounter(200)classcountsthenumberofsuccessfulresponsestoINFOrequests.

•

InfocountercountsthenumberofINFOmessagesreceivedandsent.

•

BadEventcounter(489response)countsresponsestoSUBSCRIBErequestswitheventtypesthatarenotunderstoodbytheserver.

•

OkSubscribecounter(200class)countsthenumberof200OKSIPmessagesreceivedandsentinresponsetoSubscribemessages.

•

Subscriberequestsindicatestotalrequestsreceivedandsent.

•

SDPapplicationstatistics.
12.2(11)YT
ThiscommandwassupportedinCiscoIOSRelease12.2(11)YT.CommandoutputwasenhancedtodisplayReferresponses.
UsageGuidelines
UsethiscommandtoverifySIPconfigurations.

Examples
Thefollowingissampleoutputfromtheshowsip-uastatisticscommand:

Router#showsip-uastatistics




SIPResponseStatistics(Inbound/Outbound)


Informational:


Trying0/0,Ringing0/0,


Forwarded0/0,Queued0/0,


Success:


OkInvite0/0,OkBye0/0,


OkCancel0/0,OkOptions0/0,


OkPrack0/0,OkPreconditionMet0/0


OkNotify0/0,202Accepted0/0


OkInfo0/0,OkSubscribe0/0


OKRefer1/0


Redirection(Inboundonly):


MultipleChoice0,MovedPermanently0,


MovedTemporarily0,SeeOther0,


UseProxy0,AlternateService0


ClientError:


BadRequest0/0,Unauthorized0/0,


PaymentRequired0/0,Forbidden0/0,


NotFound0/0,MethodNotAllowed0/0,


NotAcceptable0/0,ProxyAuthReqd0/0,


ReqTimeout0/0,Conflict0/0,Gone0/0,


LengthRequired0/0,ReqEntityTooLarge0/0,


ReqURITooLarge0/0,UnsupportedMediaType0/0,


BadExtension0/0,TempNotAvailable0/0,


CallLegNonExistent0/0,LoopDetected0/0,


TooManyHops0/0,AddrIncomplete0/0,


Ambiguous0/0,BusyHere0/0,


RequestCancel0/0,NotAcceptableMedia0/0


BadEvent0/0


ServerError:


InternalError0/0,NotImplemented0/0,


BadGateway0/0,ServiceUnavail0/0,


GatewayTimeout0/0,BadSipVer0/0,


PreCondFailure0/0


GlobalFailure:


BusyEverywhere0/0,Decline0/0,


NotExistAnywhere0/0,NotAcceptable0/0




SIPTotalTrafficStatistics(Inbound/Outbound)


Invite0/0,Ack0/0,Bye0/0,


Cancel0/0,Options0/0,


Prack0/0,Comet0/0


Notify0/0,Refer0/0


Info0/0




RetryStatistics


Invite0,Bye0,Cancel0,Response0,


Prack0,Comet0,Reliable1xx0,Notify0


Refer0




SDPapplicationstatistics:


Parses:4,Builds2


Invalidtokenorder:0,Invalidparam:0


NotSDPdesc:0,Noresource:0




Theshowsip-uastatisticscommandgeneratesoutput,listedinTable2,thatincludesareasonphraseandacountdescribingtheSIPmessagesreceivedandsent.Whenx/xisincludedinthereasonphrasefield,thefirstnumberisaninboundcount,andthesecondnumberisanoutboundcount.ThedescriptionfieldheadingsarebasedontheSIPresponsecodexxx,whichtheSIPprotocolusesindeterminingbehavior.SIPresponsecodesareclassifiedintooneofthefollowingsixcategories:

•

1xx:Informational,indicatescallprogress.

•

2xx:Success,indicatessuccessfulreceiptorcompletionofarequest.

•

3xx:Redirection,thataredirectserverhasreturnedpossiblelocations.

•

4xx:Clienterror,indicatesthatarequestcannotbefulfilledasitwassubmitted.

•

5xx:Servererror,indicatesthatarequesthasfailedduetoanerrorbytheserver.Itmayberetriedatanotherserver.

•

6xx:Globalfailure,indicatesthatarequesthasfailedandshouldnotbetriedagainatanyserver.

Table2describessignificantfieldsinthisoutput,inalphabeticalorder.

Table2showsip-uastatisticsFieldDescriptions

Field
Description
Note

Foreachfield,thestandardRFC2543SIPresponsenumberandmessageareshown.
Ack0/0
Aconfirmedfinalresponsereceivedorsent.
Accepted0/0
202IndicatesasuccessfulresponsetoaReferrequestreceivedorsent.
AddrIncomplete0/0
484Addresssuppliedisincomplete.
AlternateService0
380Unsuccessfulcall;however,analternateserviceisavailable.
Ambiguous0/0
485Addresssuppliedisambiguous.
BadEvent0/0
489BadEventresponseindicatesaSUBSCRIBErequestthathasaneventtypethattheservercouldnotunderstand.
BadExtension0/0
420ServercouldnotunderstandtheprotocolextensionintheRequireheader.
BadGateway0/0
502Networkisoutoforder.
BadRequest
400BadRequest(includesthemalformedViaheader).
BadSipVer0/0
505RequestedSIPversionisnotsupported.
BusyEverywhere0/0
600Calledpartyisbusy.
BusyHere0/0
486Calledpartyisbusy.
Bye0
NumberoftimesthataByerequestisretransmittedtotheotheruseragent.
Bye0/0
Terminatedthesession.
CallLegNonExistent0/0
481Serverisignoringtherequest,whichwaseitheraByerequestandtherewasnotamatchinglegIDoraCancelrequestandtherewasnotamatchingtransaction.
Cancel0
NumberoftimesthataCancelrequestisretransmittedtotheotheruseragent.
Cancel0/0
Terminatedthependingrequest.
Comet0
NumberoftimesthataCOMETrequestisretransmittedtotheotheruseragent.
Comet0/0
Conditionshavebeenmet.
Conflict0/0
409Temporaryfailure.
Decline0/0
603Callrejected.
Forbidden0/0
403IPserverhastherequest,butcannotprovideservice.
Forwarded0/0
181Callhasbeenforwarded.
GatewayTimeout0/0
504Serverorgatewaydidnotreceiveatimelyresponsefromanotherserver(suchasalocationserver).
Gone0/0
410Resourceisnolongeravailableattheserver,andnoforwardingaddressisknown.
Info0/0
IndicatesthenumberoftimesthatanINFOrequestissentandreceived.
InternalError0/0
500Serverorgatewayencounteredanunexpectederrorthatpreventeditfromprocessingtherequest.
Invite0
NumberoftimesthatanInviterequestisretransmittedtotheotheruseragent.
Invite0/0
Initiatedacall.
LengthRequired0/0
411Acontentlengthisrequired.
LoopDetected0/0
482Aloop—serverreceivedarequestthatincludeditselfinthepath.
MethodNotAllowed0/0
405Methodspecifiedintherequestisnotallowed.
MovedPermanently0
301Userisnolongeravailableatthislocation.
MovedTemporarily0
302Useristemporarilyunavailable.
MultipleChoice0
300Addressresolvestomorethanonelocation.
NotAcceptable0/0
406or606Callwascontacted,butsomeaspectofthesessiondescriptionwasunacceptable.
NotAcceptableMedia0/0
406Callwascontacted,butsomeaspectofthesessiondescriptionwasunacceptable.
NotExistAnywhere0/0
604Serverhasauthoritativeinformationthatthecalledpartydoesnotexistinthenetwork.
NotFound0/0
404Calledpartydoesnotexistinthespecifieddomain.
Notify0
NumberoftimesthataNotifyisretransmittedtotheotheruseragent.
Notify0/0
NumberofNotifymessagesreceivedorsent.
NotImplemented0/0
501Serviceoroptionnotimplementedintheserverorgateway.
OkBye0/0
200AsuccessfulresponsetoaByerequest.
OkCancel0/0
200AsuccessfulresponsetoaCancelrequest.
OkInfo
200AsuccessfulresponsetoanINFOrequest.
OkInvite0/0
200AsuccessfulresponsetoanInviterequest.
OkNotify0/0
200AsuccessfulresponsetoaNotifyrequest.
OkOptions0/0
200AsuccessfulresponsetoanOptionsrequest.
OkPrack0/0
200AsuccessfulresponsetoaPRACKrequest.
OkPreconditionMet0/0
200AsuccessfulresponsetoaPreconditionMetrequest.
OkRefer0/0
200AsuccessfulresponsetoaReferrequest.
OkSubscribe0/0
200AsuccessfulresponsetoaSUBSCRIBErequest.
Options0/0
Querythereceivingorsendingserverastoitscapabilities.
PaymentRequired0/0
402Paymentisrequiredtocompletethecall.
Prack0
NumberoftimesthataPRACKrequestisretransmittedtotheotheruseragent.
Prack0/0
Provisionalresponsereceivedorsent.
PreCondFailure0/0
580Sessioncouldnotbeestablishedbecauseoffailuretomeetrequiredpreconditions.
ProxyAuthReqd0/0
407Rejectedforproxyauthentication.
Queued0/0
182Untilthecalledpartyisavailable,themessageisqueued.
Refer0
NumberoftimestheReferrequestisretransmittedtotheotheruseragent.
Refer0/0
NumberofReferrequestsreceivedorsent.
ReqEntityTooLarge0/0
413Serverrefusestoprocesstherequestbecausetherequestislargerthanisacceptable.
ReqTimeout0/0
408ServercouldnotproducearesponsebeforetheExpirestimeout.
RequestCancel0/0
Requesthasbeencanceled.
ReqURITooLarge0/0
414Serverrefusestoprocess,becausetheURI(URL)requestislargerthanisacceptable.
Response0
NumberofResponseretries.
RetryStatistics
Oneofthethreecategoriesofresponsestatistics.
Ringing0/0
180Calledpartyhasbeenlocatedandisbeingnotifiedofthecall.
SeeOther0
303Transfertoanotheraddress.
ServiceUnavail0/0
503Serviceoptionisnotavailablebecauseofanoverloadormaintenanceproblem.
SessionProgress0/0
183Indicatesinbandalerting.
SIPResponseStatistics(Inbound/Outbound)
Oneofthethreecategoriesofresponsestatistics.
SIPTotalTrafficStatistics(Inbound/Outbound)
Oneofthethreecategoriesofresponsestatistics.
Subscribe0/0
IndicatesthenumberofSubscriberequestsreceivedorsent.
TempNotAvailable0/0
480Calledpartydidnotrespond.
TooManyHops0/0
483ServerreceivedarequestthatrequiredmorehopsthanisallowedbytheMax-Forwardheader.
Trying0/0
100Actionisbeingtakenwithnoresolution.
Unauthorized0/0
401Requestrequiresuserauthentication.
UnsupportedMediaType0/0
415Serverrefusestoprocessarequestbecausetheserviceoptionisnotavailableonthedestinationendpoint.
UseProxy0
305Callermustuseaproxytocontactcalledparty.
RelatedCommands
Command
Description
showsip-uaretry
DisplaysSIPretrystatistics.
showsip-uastatus
DisplaysSIPUAstatus.
showsip-uatimers
DisplaysthecurrentsettingsforSIPUAtimers.
sip-ua
EnablestheSIPuser-agentconfigurationcommands.
showsip-uatimers
TodisplaythecurrentsettingsfortheSessionInitiationProtocol(SIP)user-agent(UA)timers,usetheshowsip-uatimerscommandinprivilegedEXECmode.

showsip-uatimers


SyntaxDescription
Thiscommandhasnoargumentsorkeywords.

CommandModes
PrivilegedEXEC

CommandHistory
Release
Modification
12.1(1)T
ThiscommandwasintroducedonCisco2600andCisco3600seriesroutersandCiscoAS5300universalaccessservers.
12.1(3)T
Theoutputofthiscommandwaschangedtoreflectthechangesinthetimerscommand.
12.2(2)XA
ThiscommandwasimplementedontheCiscoAS5400andCiscoAS5350.
12.2(2)XB
Commandoutputwasenhancedtodisplaythefollowing:Reliableprovisionalresponses(PRACK/rel1xx),Conditionsmet(COMET),andNotifyresponses.
12.2(2)XB1
ThiscommandwasimplementedonCiscoAS5850universalgateways.
12.2(8)T
ThiscommandwasintegratedintoCiscoIOSRelease12.2(8)T.ThiscommandisnotsupportedontheCiscoAS5300,CiscoAS5350,CiscoAS5400,andCiscoAS5850platformsinthisrelease.

Forthepurposesofdisplay,thiscommandwasseparatedfromthegenericshowsip-uacommandfoundpreviouslyinthisreference.
12.2(11)T
ThiscommandwassupportedinCiscoIOSRelease12.2(11)T.
12.2(11)YT
CommandoutputwasenhancedtodisplayReferresponses.
UsageGuidelines
UsethiscommandtoverifySIPconfigurations.

Examples
Thefollowingissampleoutputfromtheshowsip-uatimerscommand:

Router#showsip-uatimers




SIPUATimerValues(millisecs)


trying500,expires150000,connect500,disconnect500


comet500,prack500,rel1xx500,notify500


refer300


Table3describessignificantfieldsinthisoutput.

Table3showsip-uatimersFieldDescriptions

Field
Description
SIPUATimerValues(millisecs)
SIPUAtimerstatus.
trying
TimetowaitbeforeaTryingmessageisretransmitted.
expires
TimetowaitbeforeanExpiresmessageisretransmitted.
connect
TimetowaitbeforeaConnectmessageisretransmitted.
disconnect
TimetowaitbeforeaDisconnectmessageisretransmitted.
comet
TimetowaitbeforeaCOMETmessageisretransmitted.
prack
TimetowaitbeforeaPRACKacknowledgmentisretransmitted.
rel1xx
TimetowaitbeforeaRel1xxresponseisretransmitted.
notify
TimetowaitbeforeaNotifyresponseisretransmitted.
refer
TimetowaitbeforeaRetryrequestisretransmitted.
RelatedCommands
Command
Description
showsip-uaretry
DisplaysSIPretrystatistics.
showsip-uastatistics
Displaysresponse,traffic,andretrySIPstatistics.
sip-ua
EnablestheSIPuser-agentconfigurationcommands.
timersrefer
TosethowlongtheSessionInitiationProtocol(SIP)useragent(UA)waitsbeforeretransmittingaReferrequest,usethetimersrefercommandinSIPuser-agentconfigurationmode.Toresettothedefault,usethenoformofthiscommand.

timersrefertime


notimersrefer


SyntaxDescription
time
Waitingtime,inmilliseconds.Rangeisfrom100to1000.Defaultis500.
Defaults
500milliseconds

CommandModes
SIPuser-agentconfiguration

CommandHistory
Release
Modification
12.2(11)YT
Thiscommandwasintroduced.
UsageGuidelines
ASIPReferrequestissentbytheoriginatinggatewaytothereceivinggatewayandinitiatescallforwardandcalltransfercapabilities.

Examples
Thefollowingexamplesetsretransmissiontimeto500milliseconds:

Router(config)#sip-ua


Router(config-sip-ua)#timersrefer500


RelatedCommands
Command
Description
showsip-uastatistics
Displaysresponse,traffic,timer,andretrystatistics.
showsip-uatimers
DisplaysthecurrentsettingsforSIPUAtimers.
Glossary
Call-ID—Ageneralheaderfieldthatuniquelyidentifiesaparticularinvitationorallregistrationsofaparticularclient.

callleg—Alogicalconnectionbetweentherouterandanotherendpoint.

CAS—channel-associatedsignaling.

CSPS—CiscoSIPproxyserver.

e-phones—IPphonesthatarenotconfiguredonthegateway.

final-recipient—Theuseragentintroducedintoacallwiththerecipient.

gateway—AgatewayallowsSIPorH.323terminalstocommunicatewithterminalsconfiguredtootherprotocolsbyconvertingprotocols.Agatewayisthepointwhereacircuit-switchedcallisencodedandrepackagedintoIPpackets.

Invite—ASIPmessagethatinitiatesaSIPsession.Itindicatesthatauserisinvitedtoparticipate,providesasessiondescription,indicatesthetypeofmedia,andprovidesinsightregardingthecapabilitiesofthecalledandcallingparties.

originator—TheuseragentthatinitiatesthetransferorReferrequestwiththerecipient.

proxy—ASIPUACorUASthatforwardsrequestsandresponsesonbehalfofanotherSIPUACorUAS.

PSTN—publicswitchedtelephonenetwork.PSTNreferstothelocaltelephonecompany.

recipient—TheuseragentthatreceivestheReferrequestfromtheoriginatorandistransferredtothefinal-recipient.

RLT—ReleaseLinkTrunking.ThetraditionalPSTNsignalingusedbyPSTNapplicationstoinitiatecalltransferoveraCAStrunk.

RTP—Real-TimeTransportProtocol.Theprotocolprovidesend-to-endnetworktransportfunctionsforapplicationsthattransmitreal-timedataandservicessuchaspayloadtypeidentification,sequencenumbering,time-stamping,anddeliverymonitoring.AnetworkprotocolusedtocarrypacketizedaudioandvideotrafficoveranIPnetwork.

SIP—SessionInitiationProtocol.Anapplication-layerprotocoloriginallydevelopedbytheMultipartyMultimediaSessionControl(MMUSIC)workinggroupoftheInternetEngineeringTaskForce(IETF).TheirgoalwastoequipplatformstosignalthesetupofvoiceandmultimediacallsoverIPnetworks.SIPfeaturesarecompliantwithIETFRFC2543,publishedinMarch1999.

SIPURL—SessionInitiationProtocolUniformResourceLocator.UsedinSIPmessagestoindicatetheoriginator,recipient,anddestinationoftheSIPrequest.Takesthebasicformofuser@host,whereuserisanameortelephonenumber,andhostisadomainnameornetworkaddress.

TCLIVR—ToolCommandLanguage(TCL)InteractiveVoiceResponse(IVR).

TELURL—TelephoneUniformResourceLocator.Describesvoicecallconnectionstoaterminal.CanalsobeanyconnectionthroughavoicemessagingsystemoraservicethatcanbeoperatedusingDTMFtones.Takesthebasicformoftel:telephone-subscriber-number,wheretelindicatesaURLandrequeststhelocalentitytoplaceavoicecall,andtelephone-subscriber-numberisthenumbertoreceivethecall.

UA—useragent.

UAC—useragentclient.AclientapplicationthatinitiatesaSIPrequest.

UAS—useragentserver(oruseragent).AserverapplicationthatcontactstheuserwhenaSIPrequestisreceivedthenreturnsaresponseonbehalfoftheuser.Theresponseaccepts,rejects,orredirectstherequest.



















Posted:TueMar207:17:54PST2004
AllcontentsareCopyright©1992--2004CiscoSystems,Inc.Allrightsreserved.
ImportantNoticesandPrivacyStatement.
                                            

                                        

                        
                        内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息 
                    

                    

                    

                        

                         标签： 
                                                

                        

                    


                

            


            

                
相关文章推荐

                

                
            

        

        

            

            
            

                

                    
新的分享

                    

                        
                    

                

            


            

                

                    
章节导航