Can I turn WebRTC off and use Flash instead?
Twilio Client 1.1 and above includes browser detection which will automatically use WebRTC if the browser supports it. Twilio Client will automatically use Flash if the browser is not able to support WebRTC.
To only use the Flash version of Twilio Client, simply include the 1.0 version of the Twilio Client javascript, like so:
<script type="text/javascript" src="https://static.twilio.com/libs/twiliojs/1.0/twilio.min.js"></script>