13339: Gather: Invalid enhanced value

Twilio sends this warning when <Gather> receives an invalid enhanced value. Set enhanced to true or false; the default is false. The enhanced attribute is deprecated and applies only to the Google STT V1 phone_call model.

• enhanced is set to a value other than true or false.

• Set enhanced to true or false in your <Gather> TwiML, or remove the attribute.
• Review the <Gather> request and TwiML to confirm the value Twilio received.

• TwiML Voice: <Gather>
• Debugging Your Twilio Application