TriggahKillah
03/02/2026, 3:32 PMAI Evy
03/02/2026, 3:32 PMAI Evy
03/02/2026, 3:32 PMAI Evy
03/02/2026, 3:32 PMAI Evy
03/02/2026, 3:32 PMTriggahKillah
03/02/2026, 4:02 PMAI Evy
03/02/2026, 4:02 PMAI Evy
03/02/2026, 4:03 PMsip:sip.retellai.com
- Check that your telephony provider's call forwarding/overflow rules are correctly routing to this URI
2. Check Inbound Call Logs
Review the SIP connection logs in your Retell call logs—they can help diagnose why the connection is failing. [(2) ]()
3. Common Causes for Disconnection
- **Origination settings misconfigured**: Verify your SIP trunking provider's origination URI is pointing to Retell correctly [(1) ]()
- **Authentication issues**: If using credential-based authentication, confirm the username/password are correct
- **IP whitelisting**: Some providers require whitelisting Retell's IP block: 18.98.16.120/30 (all regions) , 143.223.88.0/21, or 161.115.160.0/19 (certain US traffic)
4. Conditional Call Forwarding Setup
For overflow handling, ensure your telephony system is set to forward calls to the AI agent after a specific ring duration or when the line is busy/unanswered. [(3) ]()
Next Steps:
- Check logs in your telephony provider's dashboard for error details
- Verify the agent is correctly bound to the imported phone number
- Test with a direct inbound call to rule out overflow-specific routing issues
Could you share more details about your telephony setup (e.gAI Evy
03/02/2026, 4:03 PMAI Evy
03/02/2026, 4:03 PMAI Evy
03/02/2026, 4:03 PM