> ## 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.

# SIP for Retell

> Find your Retell SIP URI and paste it into Tuner SIP Settings.

<Info>
  Start at [**Simulation SIP setup**](/docs/simulation/setup).
</Info>

Retell surfaces SIP next to an imported number, SIP trunk, or agent telephony settings, the label varies by deployment. Copy the **complete destination URI** Retell shows for **inbound** calls to your agent.

* SIP URI: whatever Retell displays (often `sip:<identifier>@sip.retellai.com`).
* Username / Password: leave empty unless Retell issued digest credentials.

Follow Retell's docs for the current dashboard steps:

* [Receive calls](https://docs.retellai.com/deploy/inbound-call)
* [Custom telephony](https://docs.retellai.com/deploy/custom-telephony)

<Note>
  If your integration uses Retell's [Register Phone Call](https://docs.retellai.com/api-references/register-phone-call) API, the returned `sip:{call_id}@sip.retellai.com` is **temporary** (\~5 min) and meant for programmatic dialing, not for **Agent Settings → SIP Settings**. Use a stable SIP endpoint instead.
</Note>

## Paste into Tuner

1. In Tuner: **Agent Settings** → **SIP Settings**.
2. Paste **SIP URI** (and username/password only if Retell provides them).
3. Click **Verify & Save**.

<img src="https://mintcdn.com/tuner/ymjXbsRhUG5GDj0_/images/simulation/sip-settings.png?fit=max&auto=format&n=ymjXbsRhUG5GDj0_&q=85&s=2a1b0de8f19925d16279808972da8c3a" alt="Tuner Agent Settings — SIP Settings" width="1024" height="303" data-path="images/simulation/sip-settings.png" />

***

<Card title="Run your first simulation" icon="flask" iconType="solid" href="/user-guide/simulation/introduction-to-call-simulation#how-it-works">
  Configure your simulation mix and start a batch.
</Card>