Twilio's Programmable Voice SIP product enables you to use your existing SIP communications infrastructure (e.g. IP-PBX, SBC, etc) to initiate SIP sessions ...
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ProgrammableVoice
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GettingStartedwithProgrammableVoice
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Overview
Twilio’sProgrammableVoiceSIPproductenablesyoutouseyourexistingSIPcommunicationsinfrastructure(e.g.IP-PBX,SBC,etc)toinitiateSIPsessionswithTwilioanduseTwiMLand/ortheRESTAPIstocreateadvancedvoiceapplications.Twiliositsinthemiddle,enablingcallstoberoutedtoyourSIPcommunicationsinfrastructure,PSTN,ortobrowsersandmobileapps.ThereareafewshortstepstoconfigureTwiliotointeroperatewithyourinfrastructuresoyoucanstartbuildingandtestingyourvoiceapp.
Howitworks
TosendSIPtoTwilio'scloudyouneedtocreateaTwilioSIPDomain.ASIPdomainisacustomDNShostnameassociatedwithyourTwilioaccountthatcanacceptSIPtraffic.IfanyonemakesaSIPrequestusingthatdomain,(e.g.sip:[email protected]),itwillberoutedovertheinternettoTwilio.WhenaSIPrequestisreceivedbyTwilio,theSIPdomainisusedtodeterminetheauthenticationcriteriaandsubsequentlyusedtolookuptheconfiguredURLtowebhooktoyourapplicationthatwillprovideinstructionsonhowtohandletheincomingSIPcall.SeehowTwiliopassesdatatoyourapplication.
GettingStarted
LogintotheConsoleandselectProgrammableVoicefromtheverticalmenuontheleftsideoftheviewwhichwillbringyoutotheDashboard.NownavigatetoSIPDomains/Endpoints.
Step1:CreateaTwilioVoiceSIPDomain/Endpoint
ClickontheredplussymbolontheVoiceSIPEndpointsview
FriendlyName
ProvideafriendlynameforyourSIPDomainsuchasMyCompanySF.
SIPURI/Domainname
ThispropertyallowsyoutospecifyaglobaluniqueSIPDomainthatisusedtoroutetheSIPtrafficfromyourinfrastructureoverthepublicinternettothecorrectserverhostedbyTwiliointhecloud.
ASIPrequestusesaSIPURIsuchasthefollowing:sip:[email protected]
Twilioprocessestheincomingrequestandauthenticatesitusingyourchosenauthenticationmethod.Iftherequestisauthenticated,itwebhookstoyourrequestedURLdiscussednext.AllusersinthesameSIPdomainwebhooktothesameapplicationURL.
Domainnamescancontainletters,numbers,and“-”.Bydefault,everyaccounthasitsownTwilioAccountSIDreservedasadomain.
Ifyoutrytocreateadomainthatalreadyexists,youwillreceiveanerror.Creatingsubdomainsofexistingdomainsispermittedaslongasyouhavealreadycreatedtheoriginaldomain.Forexample:foo.example.sip.twilio.comcanonlybecreatedifyouhavealreadyreservedexample.sip.twilio.com.
Sub-accountscancreatesubdomainsofanySIPdomaininthemasteraccount.
ThereexistsaRESTAPIforcreatingDomains.
LocalizedSIPURIs
IfyouwishtomanuallyconnecttoaspecificgeographicEdgeLocationthatisclosestto
thelocationofyourcommunicationsinfrastructure,youmaydosobypointing
yourcommunicationsinfrastructuretoanyofthefollowinglocalizedSIPURIs:
{example}.sip.ashburn.twilio.com(NorthAmericaVirginia)
{example}.sip.umatilla.twilio.com(NorthAmericaOregon)
{example}.sip.dublin.twilio.com(EuropeIreland)
{example}.sip.frankfurt.twilio.com(EuropeFrankfurt)
{example}.sip.singapore.twilio.com(AsiaPacificSingapore)
{example}.sip.tokyo.twilio.com(AsiaPacificTokyo)
{example}.sip.sao-paulo.twilio.com(SouthAmericaSãoPaulo)
{example}.sip.sydney.twilio.com(AsiaPacificSydney)
IfyouarelookingforalistoflegacySIPlocalizedURIs,visithere.
RequestURL(webhook)
PleasespecifyaURLthatpointstoyourwebapplicationthatTwiliowillinvokeuponreceiptofaSIPINVITE.TheURLmustrespondwithTwiMLthatspecifieshowtohandletheincomingcall.Alternatively,youcanspecifyaURLthatpointstoastaticTwiMLbin.
BelowisaURLyoucanuseasanexampleofastaticTwiML.WhenTwilioreceivestheSIPINVITE,afterauthentication,itwillaccepttheINVITE,establishthecallandsayabriefmessagetothecaller.
http://twimlets.com/message?Message%5B0%5D=Congratulations!%20You%20just%20made%20your%20first%20call%20with%20Twilio%20SIP.
FallbackURL
IftheRequestURLfails(forinstance,duetoaninvalidTwiML),thenoptionallyyoucanspecifythatthisURLbeinvoked.
StatusCallbackURL
Optionally,youcanspecifyaURLforTwiliotosendwebhookrequeststoasacallprogressesfrom,initiatedtoringingtoansweredtocompleted.
Authentication
AuthenticationlimitsaccesstoyourSIPDomainfromonlyapproveddevicesandusers.YoumustconfigureaminimumofeitheranAccessControlListoracredentiallist.Ifyouconfigureboth,thenbothACLsandcredentiallistsareenforced.
IPAccessControlLists(ACL)
Ifconfigured,thenTwiliowillonlyacceptSIPtrafficoriginatingfromtheIPsinthislist-allotherpacketswillbedropped.YoumustspecifyafullIPaddress;noIPwildcardingissupported.IPAccessControlListscanbeappliedtooneormoreSIPDomains.
ThereexistsaRESTAPIforcreatingIPACLs.
CredentialLists
CredentialListsaresetsofusernamesandpasswordsthatwillbeacceptedbyyourSIPDomain.
IfaCredentialListisconfigured,yourSIPINVITEwillbechallengedwitha407ProxyAuthenticationRequiredrequestingtheappropriateusernameandpassword.
Foreachusername,youmustsetapasswordthatmeetsthefollowingminimumrequirements:
Minimumof12characters
Atleastonemixedcase
Atleastonedigit
Twiliodoesnotstorethepasswordsyouprovideforusernamesincleartext;instead,thepasswordsareMD5hashedinaccordancewiththedigestauthenticationspecification.Onceapasswordisset,Twiliodoesnotprovideawaytoretrievethestoredpassword.CredentialListscanbeappliedtooneormoreSIPDomains.
ARESTAPIexistsforcreatingCredentialLists.
Step2:AllowTwilio’sIPaddressesandports
Toensurethatyourcommunicationsinfrastructuredoesn’tblockcommunication,youmustupdateyourallowlist.SeetheSIPdocumentationfordetails.
Step3:StartsendingSIPtoyourTwilioSIPDomain
NowthatTwilio’sIPsandportsareallowedinyoursystemandyourSIPDomainiscreated,youcansendSIPrequeststoTwilio.IfyouusedtheexampleURLfromStep1,youwillhear:
“Congratulations!YoujustmadeyourfirstcallwithTwilioSIP.”
AdvancedFeatures
SIPCustomHeaders
InordertobetterintegratewithremoteSIPapplications,TwilioreadstheheadersthataresentintheSIPrequestandresponsemessages.TwiliowillreadanyheadersbeginningwiththeX-andprependedwithSipHeader_prefixinrequestparameters.
Youcansendmultipleparam&valuepairsaspartofthesameheader.Forexample,
X-TestHeader:param1=value1;param2=value2;param3=value3
IfyousendheaderswithoutX-prefix,Twiliowillnotreadtheheader.Asaresult,theheaderwillnotbepassedintheoutput.
UUI(User-to-UserInformation)Header
Inordertopassthecontextualinformationofthecaller,customersuseUUI(User-to-UserInformation)headerinSIPrequestmessages.YoucanpassaUUI(User-to-User)headerthroughawebhookasaparameterforincomingcallstoTwilio.
SimplyaddUUISIPheaderaspartoftheSIPmessagebeforesendingittoTwilio.Theheaderswillbesentasrequestparametersinthewebhookrequestedfromyourserver.Forexample,ifyousendthefollowingSIPheadersinyourSIPmessage:
User-to-User:123456789;encoding=hex
TwiliowillprependtheUUIheaderwithSipHeader_prefixinwebhookrequesttoyourserver.Forexample,
SipHeader_User-to-User"123456789;encoding=hex".
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Wealldosometimes;codeishard.Gethelpnowfromoursupportteam,orleanonthewisdomofthecrowdbyvisitingTwilio'sStackOverflowCollectiveorbrowsingtheTwiliotagonStackOverflow.
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