13326: Gather: Invalid input value

This warning occurs when <Gather> receives an unsupported input value. <Gather> accepts dtmf, speech, or dtmf speech, and uses dtmf by default when you do not set input.

• The <Gather> input attribute is set to a value other than dtmf, speech, or dtmf speech.
• The input value is formatted incorrectly or does not match the supported combined value exactly.

• Update <Gather> so the input attribute uses one of the supported values: dtmf, speech, or dtmf speech.
• Remove the input attribute if you want <Gather> to use its default dtmf behavior.
• If you need both keypad and speech input, use the documented combined value exactly.

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