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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.

Start at Simulation SIP setup.

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Step 1: Create a Free Vapi SIP trunk

  1. Open the Vapi dashboard → Phone Numbers.
  2. Create Phone Number → Free Vapi SIP.
  3. Fill in:
    • SIP Identifier (used in your SIP URI)
    • Label (your reference only)
    • Username and Password (digest auth)
  4. Click Import SIP URI.
Creating a Free Vapi SIP trunk (Phone Numbers → Free Vapi SIP) Your SIP URI will match: 
sip:<SIP Identifier>@sip.vapi.ai
Save username and password immediately. Vapi shows the password only once. If you lose it, delete the trunk and create a new one.
Simulation calls will not connect if this step is skipped.
  1. Phone Numbers → click your SIP trunk.
  2. Under Inbound Settings, set Assistant to the assistant Tuner should reach.
  3. Save.
Link your Vapi assistant to the SIP trunk — Inbound Settings

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Step 3: Paste into Tuner

  1. Agent Settings → SIP Settings.
  2. SIP URI: sip:<identifier>@sip.vapi.ai
  3. Username / Password: same values as in Step 1.
SIP configuration in Tuner

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Troubleshooting

IssueWhat to check
Calls fail to connectAssistant linked to trunk (Step 2). Credentials match Vapi and Tuner. URI exactly sip:identifier@sip.vapi.ai.
Assistant silentAssistant has a prompt and is active (not draft/paused).
Unverified in TunerNo trailing spaces on URI or password. Verify & Save again.
Paste your SIP URI and credentials into Agent Settings → SIP Settings, click Verify & Save, and you’re ready to run simulations.
Next: Run your first simulation.