Modifying Calls in Progress with TwiML

The Programmable Voice Calls REST API now accepts TwiML when updating in progress calls. Prior to this change, you were required to provide an absolute Url that Twilio would use to return TwiML from your application. This change allows you to provide TwiML instructions when modifying in progress calls thus simplifying your application. For more details on modifying live calls checkout Modify Calls In Progress.