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Your AI assistant’s behavior is shaped by two things: the engine mode you’ve selected and the system prompt you’ve written. Most behavior problems can be resolved by adjusting one or both.

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Engine Modes

Intellixent offers three engine modes. The mode you choose affects how your assistant processes speech and generates responses.

Fast Engine

Quick, conversational responses. May occasionally miss context on complex inputs. Best for simple interactions and outbound sales calls. Pairs well with Filler Audio for a natural flow.

Standard Engine

Balanced speed and understanding. The recommended starting point for most new assistants and a good default for general use cases.

Accurate Engine

Deep context understanding and more considered responses. Best for complex support scenarios or detailed information gathering. Expect slightly longer pauses between turns.

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Common Issues and Fixes

The assistant may be using a faster engine that prioritizes speed over accuracy.Steps to fix:
  1. Switch to Accurate Engine in your assistant’s AI Engine Configuration settings.
  2. Add more context to your system prompt — explain who the caller is likely to be and what they typically ask.
  3. Include example conversations in your prompt to show the assistant how to handle ambiguous inputs.
Unnatural flow is often caused by processing pauses or overly rigid prompt phrasing.Steps to fix:
  1. Enable Filler Audio in your assistant settings so the AI fills silence with natural sounds (“hmm”, “one moment”) while processing.
  2. Switch to Fast Engine for quicker back-and-forth exchanges.
  3. Add sample conversation snippets to your prompt to demonstrate a more natural cadence.
Repetitive responses usually indicate the prompt is too narrow or the engine is over-fitting to a short instruction set.Steps to fix:
  1. Review and expand your system prompt — add variation examples and cover edge cases.
  2. Explicitly instruct the assistant to vary its phrasing when repeating information.
  3. Consider switching from Fast to Standard or Accurate engine for more varied output.
Slow responses can frustrate callers, especially in sales or high-volume scenarios.Steps to fix:
  1. Switch to Fast Engine mode.
  2. Enable Filler Audio to mask processing time with natural sounds.
  3. Simplify your system prompt — long, complex prompts increase processing time.

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Optimization by Use Case

Different call types benefit from different configurations:
Use caseRecommended engineAdditional tip
Outbound salesFastEnable Filler Audio for engagement
Customer supportAccurateAdd detailed context and FAQs to the prompt
Lead qualificationStandardGood balance for mixed conversation types

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Testing Your Changes

After adjusting engine settings or your prompt, validate the changes before deploying to live calls:
1

Run a test call

Use the Test Call feature in your assistant settings to simulate a real inbound or outbound call.
2

Try multiple scenarios

Test edge cases — unusual questions, interruptions, unclear speech — not just the happy path.
3

Review recordings

Listen to the call recording and review the transcript to check whether the behavior has improved.
Start with Standard Engine and only switch modes once you’ve identified a specific problem. Changing both the engine and the prompt at the same time makes it harder to know which change had the effect.