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Configure how eagerly your persona responds to the user and how it handles silence via voiceDetectionOptions in the persona config. 
const personaConfig = {
  name: "Cara",
  avatarId: "30fa96d0-26c4-4e55-94a0-517025942e18",
  voiceId: "6bfbe25a-979d-40f3-a92b-5394170af54b",
  llmId: "a7cf662c-2ace-4de1-a21e-ef0fbf144bb7",
  systemPrompt: "You are Cara, a helpful customer service representative.",
  voiceDetectionOptions: {
    endOfSpeechSensitivity: 0.5,
    silenceBeforeSkipTurnSeconds: 5,
    silenceBeforeSessionEndSeconds: 3,
    silenceBeforeAutoEndTurnSeconds: 5,
    speechEnhancementLevel: 0.8
  }
};

​
Options

OptionRangeDescription
endOfSpeechSensitivity0 – 1How eager the persona is to start speaking. 0 = waits until confident the user is done. 1 = responds earlier.
silenceBeforeSkipTurnSeconds0 – 900 secondsHow long the user can be silent before their turn is skipped and the persona prompts them. Set to 0 to disable turn skip so the persona never prompts a quiet user.
silenceBeforeSessionEndSeconds0 – 7200 secondsHow long the user can be silent before the session ends automatically. Set to 0 to disable automatic session end.
silenceBeforeAutoEndTurnSeconds0.5 – 10 secondsIf the user starts speaking then stops, how long to wait before treating the turn as complete.
speechEnhancementLevel0 – 1Level of noise reduction and voice enhancement applied to input audio. Higher values improve transcription accuracy in noisy environments.
Setting silenceBeforeSkipTurnSeconds to 0 disables turn skip — the persona will not prompt a quiet user. Setting silenceBeforeSessionEndSeconds to 0 disables automatic session end on silence.
These settings can be set when creating or updating a persona. See the API Reference for details.
Last modified on May 19, 2026