Thanks for sharing the details. To help diagnose the issue, can you confirm if you have allowlisted the required Vapi SIP IP addresses (

44.229.228.186/32

and

44.238.177.138/32

) on your firewall as recommended in the [Vapi SIP trunk documentation](https://docs.vapi.ai/advanced/sip/sip-trunk)? This step is crucial, as missing allowlisting can cause Vapi packets to be blocked, leading to registration drops. Source: - [SIP Trunking](https://docs.vapi.ai/advanced/sip/sip-trunk)

checking if this is resolved/solved for you?