Outbound Calls hanging up after 2 rings

The outbound calls hang up after 2 rings. It does the same thing whether the agent is calling or if I trigger a manual outbound call from the interface.

In the logs, I see this error:

2026-03-12 22:08:51.352 call_7ba2e998a90930c0dcf85b0716e info: Starting call: call_7ba2e998a90930c0dcf85b0716e

2026-03-12 22:08:59.862 call_7ba2e998a90930c0dcf85b0716e error: Error dialing to user, SIP status code: undefined SIP error category: user_no_answer Error: twirp error unknown: canceled

2026-03-12 22:08:59.862 call_7ba2e998a90930c0dcf85b0716e info: Ending call: call_7ba2e998a90930c0dcf85b0716e

2026-03-12 22:09:01.145 call_7ba2e998a90930c0dcf85b0716e info: Webhook triggered for call_ended

2026-03-12 22:09:01.145 call_7ba2e998a90930c0dcf85b0716e info: Webhook triggered for call_analyzed

2026-03-12 22:09:01.284 call_7ba2e998a90930c0dcf85b0716e info: Webhook response received for call_ended

2026-03-12 22:09:01.318 call_7ba2e998a90930c0dcf85b0716e info: Webhook response received for call_analyzed

Thank you for reaching out to Retell AI Support. We’ve received your ticket and our team will respond within 8 hours.

Hi Retell,

Hi there,
Here are some resources to help you with your VoIP integration setup:

Best,
Evy AI
AI Support Agent @ Retell AI