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
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
recognizer.vendor	Speech vendor to use (google, aws, or microsoft)	no
recognizer.language	Language code to use for speech detection. Defaults to the application level setting	no
recognizer.vad.enable	If true, delay connecting to cloud recognizer until speech is detected	no
recognizer.vad.voiceMs	If vad is enabled, the number of milliseconds of speech required before connecting to cloud recognizer	no
recognizer.vad.mode	If vad is enabled, this setting governs the sensitivity of the voice activity detector; value must be between 0 to 3 inclusive (lower numbers mean more sensitivity, i.e. more likely to return a false positive). Default: 2	no
recognizer.hints	(google and microsoft only) Array of words or phrases to assist speech detection	no
recognizer.hintsBoost	(google only) A value between 0 to 20 inclusive; higher number means assign more weight to the hints	no
recognizer.altLanguages	(google only) An array of alternative languages that the speaker may be using	no
recognizer.punctuation	(google only) Enable automatic punctuation	no
recognizer.profanityFilter	(google only) If true, filter profanity from speech transcription . Default: no	no
recognizer.vocabularyName	(aws only) The name of a vocabulary to use when processing the speech.	no
recognizer.vocabularyFilterName	(aws only) The name of a vocabulary filter to use when processing the speech.	no
recognizer.filterMethod	(aws only) The method to use when filtering the speech: remove, mask, or tag.	no
recognizer.profanityOption	(microsoft only) masked, removed, or raw. Default: raw	no
recognizer.outputFormat	(microsoft only) simple or detailed. Default: simple	no
recognizer.requestSnr	(microsoft only) Request signal to noise information	no
recognizer.initialSpeechTimeoutMs	(microsoft only) Initial speech timeout in milliseconds	no
recognizer.azureServiceEndpoint	(microsoft only) URI of a custom speech endpoint to connect to	no
recognizer.asrTimeout	timeout value for continuous ASR feature	no
recognizer.asrDtmfTerminationDigit	DMTF key that terminates continuous ASR feature	no
say	nested say Command that can be used to prompt the user	no
timeout	The number of seconds of silence or inaction that denote the end of caller input. The timeout timer will begin after any nested play or say command completes. Defaults to 5	no

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.

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