"Reinventing the Dialplan" slides from Twilio's Astricon 2009 talk

-Call ing c n to X re P B Click- fe n y on R pa C IV m Co Voice Applications Asterisk

ci - n to X re P B Click- fe n y n a o p R C IV m Co Voice Applications The Cloud Asterisk

Voice Applications Voice Guru

Maintained by your Voice Guru Asterisk Native scripting language Dialplan written by your Voice Guru Application Asterisk Dialplan Language: Native Scripting Where: Local on call router

IP Asterisk AGI/AMI Java/C/Ruby... Application Asterisk AGI/AMI Language: AGI/AMI API + Where: Remote via IP Java/C/Ruby/Python/Etc

Maintained by your Voice Guru IP Asterisk AGI/AMI Java/C/Ruby... Application Asterisk AGI/AMI Language: AGI/AMI API + Where: Remote via IP Java/C/Ruby/Python/Etc

Maintained by your Programmer IP Asterisk AGI/AMI Java/C/Ruby... Application Asterisk AGI/AMI Language: AGI/AMI API + Where: Remote via IP Java/C/Ruby/Python/Etc

Enter the Programmer • Commodity skillset • Easy to hire • Cheap Programmer

Better but... IP Asterisk Large API with "lite" documentation. AGI/AMI The distinction between AGI/AMI can be confusing. Tight integration between call router and voice app: direct socket Java/C/Ruby... connections Application SCALING=HARD Asterisk AGI/AMI Language: AGI/AMI API + Where: Remote via IP Java/C/Ruby/Python/Etc

IP Asterisk AGI/AMI Lets mull this over...

IP Asterisk AGI/AMI Why do I need a Voice Guru?

IP Asterisk AGI/AMI Expert What if I outsourced my voice guru?

IP AGI/AMI Asterisk in the Cloud

IP ????? Asterisk in the Cloud What is the ideal voice app API?

Web developers are (one of) the largest engineering workforces on the planet • HTTP • Request/Response • XML/JSON • WAV/MP3

Magic Ruby Java Asterisk in PHP the Cloud Python . . . Create new messaging protocol and new API for each language?

HTTP/XML Ruby REST Java Asterisk in PHP the Cloud Python . . . Normal Web Server HTTP/XML/REST

HTTP/XML Ruby REST Java PHP Python Twilio . . . Normal Web Server HTTP/XML/REST

HTTP/XML REST Google App Engine Microsoft Azure Twilio Heroku Leverage existing cloud hosting Scale: 1-10,000’s of simultaneous calls

Request/Response 1 Procedural programming digits = GetKeypadPresses(); switch(digits) { case 1: blah(); break; }

Request/Response 1 Procedural programming digits = GetKeypadPresses(); switch(digits) { case 1: blah(); break; } Not how HTML works!

Request/Response 2 Web programming <form action=”digits.php”> <input type=”text” name=”digits” /> <input type="submit" value="Go"/> </form>

Request/Response 2 Web programming <form action=”digits.php”> <input type=”text” name=”digits” /> <input type="submit" value="Go"/> </form> Submit back to digits.php on input

Request/Response 3 Web-like voice programming <Gather numDigits=”5” action=”digits.php”/> Apply the same model for voice applications

Request/Response 3 Web-like voice programming <Gather numDigits=”5” action=”digits.php”/> Submit back to digits.php on input

Request/Response 4 Language-speciﬁc libraries $r = new Response(); $r->append(new Say("Hello World"); PHP $r->Respond(); r = twilio.Response() r.append(twilio.Say("Hello World")) Python print r @r = Twilio::Response.new @r.append(Twilio::Say.new "Hello World") Ruby puts @r.respond TwiMLResponse response = new TwiMLResponse(); Say say = new Say("Hello World"); Java System.out.println(response.toXML());

⤸ ⤸ ⤸ HTTP 307 HTTP 307 u.com b.com c.com PBX Application Authorization CRM Service Integration Response Chaining

Stateless ‘Twimlet’ URLs + REST

curl -fSs -u "$ACCOUNTSID: $AUTHTOKEN" -d "Caller=$CALLERID" -d "Called=$PHONE" -d "Url=http:// twimlets.com/message?Message=$MSG" "https://api.twilio.com/2008-08-01/ Accounts/$ACCOUNTSID/Calls Stateless ‘Twimlet’ URLs + REST

Put the Voice Guru in the Cloud 1 Asterisk in the cloud Adopt a standards-based web API 2 HTTP/XML/REST Leverage existing web infrastructure 3 Apache/Tomcat/AWS/AppEngine/Azure/Heroku Let the cloud handling scaling 4 1-10,000’s simultaneous calls Don’t break request/response model 5 Build libraries for PHP/Python/Java/C#/Ruby etc.

ci - n to X re P B Click- fe n y n a o p R C IV m Co Voice Applications The Cloud Asterisk

Simplifying Telecom Simple • Powerful • Pay-As-You-Go Evan Cooke Co-Founder & CTO twitter: @twilio phy@twilio.com http://www.twilio.com

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"Reinventing the Dialplan" slides from Twilio's Astricon 2009 talk

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