The gather command is used to collect dtmf or speech input.

{
  "verb": "gather",
  "actionHook": "http://example.com/collect",
  "input": ["digits", "speech"],
  "bargein": true,
  "dtmfBargein": true,
  "finishOnKey": "#",
  "numDigits": 5,
  "timeout": 8,
  "recognizer": {
    "vendor": "Google",
    "language": "en-US",
    "hints": ["sales", "support"],
    "hintsBoost": 10
  },
  "say": {
    "text": "To speak to Sales press 1 or say Sales.  To speak to customer support press 2 or say Support",
    "synthesizer": {
      "vendor": "Google",
      "language": "en-US"
    }
  }
}

You can use the following options in the gather command:

option	description	required
actionHook	Webhook POST to invoke with the collected digits or speech. The payload will include a 'speech' or 'dtmf' property along with the standard attributes. See below for more detail.	yes
actionHookDelayAction	object, see here for details.	no
bargein	allow speech bargein, i.e. kill audio playback if caller begins speaking	no
dtmfBargein	allow dtmf bargein, i.e. kill audio playback if caller enters dtmf	no
finishOnKey	Dmtf key that signals the end of input	no
input	Array, specifying allowed types of input: ['digits'], ['speech'], or ['digits', 'speech']. Default: ['digits']	no
interDigitTimeout	Amount of time to wait between digits after minDigits have been entered.	no
listenDuringPrompt	if false, do not listen for user speech until say or play has completed. Defaults to true	no
minBargeinWordCount	if bargein is true, only kill speech when this many words are spoken. Defaults to 1	no
minDigits	Minimum number of dtmf digits expected to gather. Defaults to 1.	no
maxDigits	Maximum number of dtmf digits expected to gather	no
numDigits	Exact number of dtmf digits expected to gather	no
partialResultHook	Webhook to send interim transcription results to. Partial transcriptions are only generated if this property is set.	no
play	nested play Command that can be used to prompt the user	no
fillerNoise	play audio to the caller while the remote application is processing gather transcriptions. See Using filler noise for more details.	no
fillerNoise.enable	boolean, whether to enable or disable filler noise	yes
fillerNoise.url	http(s) audio to play as filler noise	yes
fillerNoise.startDelaySecs	integer value specifying number of seconds to wait for a response from the remote	recognizer

In the case of speech input, the actionHook payload will include a speech object with the response from Google speech:

"speech": {
			"stability": 0,
			"is_final": true,
			"alternatives": [{
				"confidence": 0.858155,
				"transcript": "sales please"
			}]
		}

In the case of digits input, the payload will simple include a digits property indicating the dtmf keys pressed:

"digits": "0276"

Note: an HTTP POST will be used for both the action and the partialResultCallback since the body may need to contain nested JSON objects for speech details.

Note: the partialResultCallback web callback should not return content; any returned content will be discarded.