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voice ai hallucination

How to Stop Voice AI Hallucinations With a Knowledge Base

Why voice AI hallucinates on calls and how a RAG knowledge base fixes it. Ground answers in your real docs, cite sources, and configure the agent to say I don't know.

E
By Edesy Team
Published: July 12, 2026•11 min read
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Table of contents

  • Quick verdict (TL;DR)
  • Why voice AI hallucinates in the first place
  • Why hallucinations are worse on a phone call
  • How RAG grounding fixes it
  • Guardrails beyond retrieval
  • Configure the agent to say "I don't know"
  • Route to a human on a clean handoff
  • Turn on source citing
  • Keep your documents clean and current
  • How to measure and reduce hallucinations
  • Frequently asked questions
  • What causes voice AI to hallucinate?
  • Does RAG completely eliminate hallucinations?
  • Why are hallucinations worse on a phone call than in a chatbot?
  • How do I make my voice agent more accurate?
  • What should the agent do when it doesn't know the answer?
  • Conclusion
  • Related resources
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