> ## Documentation Index > Fetch the complete documentation index at: https://www.voiceflow.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Behaviour settings > Definitions for behaviour settings, with explanations of how each term fits into Voiceflow and links to the related documentation. ## Behaviour settings ### Default model The LLM that powers the agent: the model, its temperature and its max token limit. Overridable per playbook. **Also asked as:** - change which AI model the assistant uses - switch to a different provider's model - set the temperature for the whole agent - does a bigger model cost more per message - which model burns the most credits **Related:** [Model](/docs/resources/glossary/ai-terms#model) · [Temperature](/docs/resources/glossary/ai-terms#temperature) · [Outage protection](#outage-protection) **Documented in:** [Behaviour › Default model](/docs/documentation/build/behaviour#default-model) · [Playbooks › Model settings](/docs/documentation/build/playbooks#model-settings) ### Memory How many conversation turns the agent keeps in context (10–100, default 50), stored in the `{vf_memory}` variable. Higher values give the agent more history to work with but increase latency and token usage. **Also asked as:** - how far back does the assistant remember - the bot loses track of earlier parts of the chat - previous turns getting dropped from context - the bot forgets things said earlier in the conversation - how much of the chat history does the assistant keep - it stops remembering after a while **Related:** [Context window](/docs/resources/glossary/ai-terms#context-window) · [Chat persistence](#chat-persistence) · [Behaviour](/docs/resources/glossary/build/agent-setup#behaviour) **Documented in:** [Behaviour › Memory](/docs/documentation/build/behaviour#memory) ### Faster processing Priority processing for supported models. Uses more credits; off by default. **Also asked as:** - make replies come back quicker - reduce model latency at extra cost - responses take too long to come back - speed up slow replies **Related:** [Default model](#default-model) · [Credits](/docs/resources/glossary/measure#credits) **Documented in:** [Behaviour › Faster processing](/docs/documentation/build/behaviour#faster-processing) ### Outage protection Automatic detection of a model provider outage, with a fallback LLM provider you configure per provider. **Also asked as:** - what happens if the model provider goes down - fallback model during an outage - switch to another model provider automatically when one is down - keep the agent running through a provider incident **Related:** [Default model](#default-model) **Documented in:** [Behaviour › Outage protection](/docs/documentation/build/behaviour#outage-protection) ### Timezone The timezone for `{vf_now}` and the other built-in time variables, and for any time-aware behaviour: the agent's internal clock. **Also asked as:** - the bot gets the current time or date wrong - set which clock the assistant uses - the agent thinks it's a different time of day - make date and time values match our region **Related:** [Built-in variables](/docs/resources/glossary/knowledge-and-data#built-in-variables) **Documented in:** [Behaviour › Timezone](/docs/documentation/build/behaviour#timezone) ### Voice output The text-to-speech side of a voice agent: the provider (ElevenLabs, Cartesia, Rime, Google Chirp, Amazon, Microsoft), the voice, the synthesis model, real-time sync of audio and text, and voice tuning. Also available in chat projects through the widget's voice mode. **Also asked as:** - change the voice the assistant speaks with - pick a different text-to-speech provider - make the voice sound more natural or slower **Related:** [Pronunciation dictionary](#pronunciation-dictionary) · [Background audio](#background-audio) · [Voice input](#voice-input) **Documented in:** [Behaviour › Voice output](/docs/documentation/build/behaviour#voice-output) · [Behaviour › Provider, voice, and model](/docs/documentation/build/behaviour#provider-voice-and-model) · [Behaviour › Voice tuning](/docs/documentation/build/behaviour#voice-tuning) · [Behaviour › Sync audio and text output](/docs/documentation/build/behaviour#sync-audio-and-text-output) ### Pronunciation dictionary Rewrites words or phrases in the agent's responses before they are sent to text-to-speech, so names, places and product terms are pronounced correctly. **Also asked as:** - the voice mispronounces our brand - teach the assistant how to say a name - fix how a word is spoken on calls - the voice says a customer's name wrong - our product name is pronounced incorrectly on calls - correct how a word sounds in the spoken reply **Related:** [Voice output](#voice-output) · [Keywords](#keywords) **Documented in:** [Behaviour › Pronunciation dictionary](/docs/documentation/build/behaviour#pronunciation-dictionary) ### Background audio Optional ambient audio and audio cues played on a call, for example while the agent is processing. Also available in chat projects through the widget's voice mode. **Also asked as:** - play hold music while the bot is thinking - sound effects during the pauses on a call - callers hear dead air while the assistant works **Related:** [Voice output](#voice-output) **Documented in:** [Behaviour › Background audio and audio cues](/docs/documentation/build/behaviour#background-audio-and-audio-cues) ### Voice input The speech-to-text side of a voice agent: the provider (Deepgram, Gladia, Cartesia, AssemblyAI, Google), the transcription model and language, plus keywords, end-of-turn detection and keypad input. **Also asked as:** - the assistant mishears what callers say - change the transcription language - pick a different speech recognition provider **Related:** [Keywords](#keywords) · [End-of-turn detection](#end-of-turn-detection) · [Keypad input](#keypad-input) **Documented in:** [Behaviour › Voice input](/docs/documentation/build/behaviour#voice-input) · [Behaviour › Provider, model, and language](/docs/documentation/build/behaviour#provider-model-and-language) ### Keywords A comma-separated list of words to boost in transcription: product and company names, proper nouns, industry terms that standard speech recognition misses. **Also asked as:** - transcription keeps getting our product name wrong - make speech recognition pick up specific words - boost recognition of unusual terms **Related:** [Voice input](#voice-input) · [Pronunciation dictionary](#pronunciation-dictionary) **Documented in:** [Behaviour › Keywords](/docs/documentation/build/behaviour#keywords) ### End-of-turn detection Controls when the agent decides the caller has finished speaking: a confidence threshold (0.5–0.9, default 0.60) and the timing around it. **Also asked as:** - the agent interrupts callers before they finish - the bot waits too long before answering on calls - tune when the assistant starts talking **Related:** [Voice input](#voice-input) **Documented in:** [Behaviour › End-of-turn detection](/docs/documentation/build/behaviour#end-of-turn-detection) ### Keypad input Lets callers enter digits on the phone keypad (DTMF) during a call, with a timeout and other settings you configure. Voice projects only. **Also asked as:** - the caller presses a number to choose a department - read the digits someone types on their phone - touch-tone menu for a phone agent - press 1 for sales and 2 for support - let callers choose with the keypad - DTMF tones during a call **Related:** [Voice input](#voice-input) · [Playbook step](/docs/resources/glossary/build/steps#playbook-step) **Documented in:** [Behaviour › Keypad input](/docs/documentation/build/behaviour#keypad-input) ### Session timeout How long an inactive session lasts before it ends: minutes for chat projects (1–2,880, default 15, or off to keep sessions alive indefinitely) and seconds for voice projects (10–300, default 60). **Also asked as:** - the chat ends after a few minutes of inactivity - calls hang up when the caller is quiet for a while - change how long a session stays open - how long before an idle conversation is closed - the call ends if nobody speaks for a minute **Related:** [Chat persistence](#chat-persistence) · [Conversation](/docs/resources/glossary/core-objects#conversation) **Documented in:** [Behaviour › Session timeout (Chat projects)](/docs/documentation/build/behaviour#session-timeout-chat-projects) · [Behaviour › Session timeout (Voice projects)](/docs/documentation/build/behaviour#session-timeout-voice-projects) ### Chat persistence Whether chat history is kept between sessions in chat projects — never forget, forget after a period, or forget on every reload — set in Behaviour and, per embed, with the widget's `persistence` option. **Also asked as:** - the widget forgets the conversation when the page is refreshed - keep the chat going after a reload - start every visit with a fresh conversation - the conversation resets whenever the page reloads - keep the same chat when the visitor comes back - a new session every time the page refreshes **Related:** [Memory](#memory) · [Session timeout](#session-timeout) · [Chat widget API](/docs/resources/glossary/deploy#chat-widget-api) **Documented in:** [Behaviour › Chat persistence](/docs/documentation/build/behaviour#chat-persistence) · [Chat widget API › Configuring chat persistence](/docs/documentation/deploy/widget/web-chat-api#configuring-chat-persistence) ### Events Triggers for agent behaviour from outside the conversation — a webhook, a CRM update, a system alert, any external signal your application sends. Created in Behaviour and fired through the API or the widget. **Also asked as:** - make the agent react to something that happened in another system - trigger the bot from a webhook - push an external signal into a live conversation **Related:** [Behaviour](/docs/resources/glossary/build/agent-setup#behaviour) · [Chat widget API](/docs/resources/glossary/deploy#chat-widget-api) **Documented in:** [Behaviour › Events](/docs/documentation/build/behaviour#events) ### Global no-match How the agent responds when it cannot match any skill, user intention or knowledge base result: a generative prompt or a fixed reply. **Also asked as:** - the reply used when the input matches nothing - fallback message for gibberish - default answer for questions the bot cannot place - what the bot says when it doesn't understand - the reply for input that makes no sense - handle questions the agent can't place **Related:** [Global no-reply](#global-no-reply) · [Staying in scope](/docs/resources/glossary/build/agent-setup#staying-in-scope) **Documented in:** [Behaviour › Global no-match](/docs/documentation/build/behaviour#global-no-match) · [Behaviour › Fallback](/docs/documentation/build/behaviour#fallback) ### Global no-reply How the agent re-engages when the user says nothing. Off by default. **Also asked as:** - the caller goes silent, what should the bot do - prompt the visitor again when they don't answer - nudge after a period of no input **Related:** [Global no-match](#global-no-match) · [Skip turn](/docs/resources/glossary/build/tools#skip-turn) **Documented in:** [Behaviour › Global no-reply](/docs/documentation/build/behaviour#global-no-reply)