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Documentation Index

Fetch the complete documentation index at: https://docs.usetuner.ai/llms.txt

Use this file to discover all available pages before exploring further.

For an overview of how simulation works, see Introduction to Call Simulation.

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Prerequisites

  • A Retell account with an active agent
  • An agent created in Tuner with prompt and evaluation rules configured (see Connecting to Retell)
  • Tuner credits available for simulation calls

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Step 1: Prepare Your Agent in Retell

  1. Log in to Retell.
  2. Create (or verify) your agent with the desired prompt, tools, and settings.
  3. Ensure the agent is active and ready to receive calls.
No SIP trunk configuration is required on the Retell side, Tuner connects directly.

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Step 2: Configure SIP in Tuner

  1. In Tuner, go to Agent Settings → SIP Settings.
  2. Enter the Retell SIP endpoint URI.
  3. Click Test Connection, then Save.
SIP configuration in Tuner
Retell’s integration typically requires only the SIP URI, no separate username/password authentication.

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Step 3: Run Your First Simulation

  1. In Tuner, open Simulations in the sidebar.
  2. Click Run Simulation.
  3. Confirm the SIP target points to your Retell agent.
  4. Set the number of calls (5–20).
  5. Adjust the simulation mix (routine vs. pressure).
  6. Click Run.
Configure and launch your simulation Results appear in the Simulations table once calls complete. Click any row for the transcript, latency breakdown, and evaluation results.

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Troubleshooting

SymptomResolution
Calls fail to connectVerify the Retell agent is active (not draft). Confirm the SIP URI in Tuner matches the Retell endpoint exactly.
Agent doesn’t respond as expectedCheck prompt and tool configuration in Retell. Run a manual test call in Retell to isolate the issue.