Advanced speech settings

Note: Advanced speech settings are only supported by telephony integrations.

This guide provides additional, advanced settings for speech features. You can toggle these advanced settings off and on by navigating to Agent settings > Speech and IVR > Speech-to-Text > Advanced speech settings.

These settings are available in agent settings (applies to entire agent), flow settings (applies to entire flow and overrides agent settings), page settings (applies to page and overrides flow and agent settings), and fulfillment settings (applies to fulfillment and overrides page, flow, and agent settings). A subset of these settings are available at each level, depending on the setting relevance for the level. *Before you can configure these settings at any lower level, you must first check the Enable advanced speech settings box at the agent level (Agent settings > Speech and IVR > Speech-to-Text > Advanced speech settings)*.

Updated agent-level settings don't propagate to the flow, page, and fulfillment level when the Customize option is selected on these lower levels. If the Customize option emcompasses multiple settings and you want to update only some of them, you might also need to update other settings if you want them to be the same as the agent-level settings.

Settings availability by level

The following table indicates which advanced speech settings are available at each level:

Setting name	Agent	Flow	Page	Fulfillment
Model selection (Speech-to-Text)	✔	✔	✔
End of speech sensitivity	✔	✔	✔
Enable advanced timeout-based end of speech sensitivity	✔
Enable smart endpointing	✔
No speech timeout	✔	✔	✔
Barge-in	✔	✔	✔	✔
Allow cancellation of partial response playback				✔
Audio export bucket	✔	✔
DTMF	✔	✔	✔

Model selection (Speech-to-Text)

Can be set at the agent, flow, and page levels.

Sets the speech model used for speech recognition. This setting is language-specific, so you can select different models for different languages. You can also check Override request-level speech model, which will cause the selected model to be used even if a runtime API call specifies a different model.

For Dialogflow CX Phone Gateway, see limitations. For more information, see Speech models.

End of speech sensitivity

Can be set at the agent, flow, and page levels.

Controls the sensitivity for recognizing the end of speech in end-user audio input. The value ranges from 0 (low sensitivity, less likely to end speech) to 100 (high sensitivity, more likely to end speech).

Note: This setting only supports the phone_call speech model for the en-US language tag unless you check the Enable advanced timeout-based end of speech sensitivity setting.

Enable advanced timeout-based end of speech sensitivity

Can be set at the agent level only.

If this setting is enabled, the End of speech sensitivity setting value is used as a gauge to establish a relative audio silence time-out to determine the end of speech. If this setting is disabled (the default), the End of speech sensitivity setting value is used to determine the end of speech by the ML model provided by Google Cloud Speech-to-Text.

While the End of speech sensitivity setting supports only the phone_call speech model for the en-US language tag by default, the Enable advanced timeout-based end of speech sensitivity setting allows for configuring end of speech sensitivity for all languages and speech models supported by Dialogflow.

Enable smart endpointing

Can be set at the agent level only.

If this setting is enabled, Dialogflow will analyze partial user input to determine the end of speech. For example, if the user says "I would like to" and pauses, Dialogflow will wait for the user to continue the sentence.

This is particularly useful for numeric parameter collection, where the user might say "1234" and pause before saying "5678". In order to apply this setting for a specific parameter, you have to set up Smart endpointing in the parameter's form.

This setting is available for the en-US language tag only and is disabled by default.

No speech timeout

Can be set at the agent, flow, and page levels.

The time duration in seconds for which Dialogflow will stop waiting for end-user audio input. The default is 5 seconds, and the maximum value is 60 seconds. For this timeout, Dialogflow invokes a no-input event.

Barge-in

Can be set at the agent, flow, page, and fulfillment levels.

When enabled, an end-user can interrupt Dialogflow response audio. When interrupted, Dialogflow will stop sending audio, and it will process the next end-user input.

If there are multiple messages in the message queue, and a message was queued by a fulfillment associated with a page, flow, or agent that has barge-in enabled, then all following messages in the queue will also have barge-in enabled. In this case, the integration will stop playing audio for all of the queued messages with barge-in enabled.

Allow cancellation of partial response playback

Can be set at the fulfillment level only.

You can enable this setting when the Enable advanced speech settings box is checked in Agent settings > Speech and IVR and partial response is enabled at the fulfillment level. This setting allows cancellation of a partial response playback.

If a message in the message queue is created by a fulfillment that allows cancellation, playback of the message is cancelled if another message is added to the queue. This is useful when you want an initial message to start playback, but for that playback to be cancelled if a working webhook produces another message before playback of the initial message completes.

Audio export bucket

Can be set at the agent and flow levels.

If supplied, any audio data associated with a request will be saved to the Cloud Storage bucket:

Audio Saved	Applicable requests
End-user audio input	DetectIntent, StreamingDetectIntent, AnalyzeContent, StreamingAnalyzeContent
Text-to-Speech (TTS) audio synthesized for a response	AnalyzeContent, StreamingAnalyzeContent

Grant the Storage Object Creator role to the following service accounts in your project:

• To the service account of the format one-click@df-cx-ALPHANUMERIC_VALUE-ALPHANUMERIC_VALUE.iam.gserviceaccount.com if you use a partner built-in telephony integration.

• To the service account of the format [e-mail] if you use the Dialogflow CX Phone Gateway integration. To find this service account in IAM, check the Include Google-provided role grants option.

DTMF

See the DTMF (Dual-tone multi-frequency signaling) documentation for more information about this feature.