Whitelist SIP Trunk IPs for incoming calls

How do I whitelist the IPs of my SIP trunk to allow incoming calls? I don’t want to allow all guest calls, I only want to allow incoming calls from specific IP ranges.

Currently the SIP trunk is receiving SIP/2.0 401 Unauthorized when trying to send INVITE for inbound calls.

In PJSIP, which you should be using, you can add Permit/Match IPs

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