They talk some about working at Twilio and Keith's role there, some about the Austin (Texas) technology scene that he participates in and a bit about the currently-happening TwilioCon that's running in San Francisco. There's also a mention of a conference that Elizabeth is involved in that's happening in November in Indianapolis, CodeConnexx (put on by the PHP Women group).

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You can make and receive phone calls and send and receive text messages using TwiML (Twilio Markup Language) and their REST API. You can work directly with the API, or use one of the available helper libraries. The library I'm using is twilio-php, which is the library released and officially supported by Twilio.

He shows you how to use the Twilio API library to create a connection object to their REST API and perform various actions like sending an SMS and placing a phone call. the code to built the multi-factor authentication is also included - a user login/password is checked against a database and a form is displayed (depending on if they want to voice call or SMS).

Cal's "three questions" for Keith revolve around his work with REST and how it relates to the Twilio API:

• What new technology do you see up and coming that will effect PHP developers the most?
• What's the most important part of REST that PHP or other developers aren't getting?
• What's one feature that developers don't know enough about in the Twilio API that you think they should?
• Bonus Question: Some information about HubAustin

You can listen to this latest episode either via the in-page player, by downloading the mp3 directly or by subscribing to their feed.

In the past I would just use my iPhone's email-to-txt email address. However, when I received the txt message, it wasn't formated very pretty, and it would have a different "From Number." So if we had a crazy day, I would have 20-30 message threads in my iPhone all about Nagios. [...] What I like out this setup is with Twilio, I can buy a phone number for $1 a month. So all my notifications come through the same number.

He's included the PHP code he uses to send the notifications (using the Twillo library) and the Nagios commands he configured to send the notifications to that script via the command line.