Hello, I am adding my number from the PBX and entering the required details. My PBX service provider asked me to contact you and inform you that: “We want to receive the calls via peer-to-peer from the IP address 185.86.153.52. The PBX sends the DID as 903845353963.” They said this needs to be checked on your side. Could you please take a look? Thank you.

Thank you for the details. To help check the SIP peer-to-peer routing, could you please confirm if the IP address 185.86.153.52 has already been added to your SIP trunk configuration or if you need assistance with allowlisting it on our side? Source: - [Vapi SIP Trunk Documentation](https://docs.vapi.ai/advanced/sip/sip-trunk)

Hi there, Thanks for sharing these details! If your PBX provider is asking whether we need to allowlist the IP 185.86.153.52 on our side: there’s no need. Vapi does not restrict inbound SIP traffic by IP, so you don’t have to worry about requesting an allowlist entry. Any properly configured SIP trunk can reach us without additional IP approvals. If you’re running into connection issues despite that, feel free to share: - The SIP trunk domain you’re using - Any recent call attempt IDs - A SIP packet capture or error log from your PBX — and we’ll help you trace the routing end-to-end. Happy to assist further!