this post was submitted on 21 Nov 2023
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You need to disable direct SIP calls, this sounds something SIPviscious initiating fake calls. I believe you can set the Grandstream to "accept from SIP proxy/server only" in the phone SIP security settings so that these calls don't get passed through.
You can also restrict 5060 to only IPs you'd expect on your firewall.
https://preview.redd.it/qf1m6g6e3x2c1.png?width=1920&format=png&auto=webp&s=788d271a6cd583ac0d60b54edead4ac7fce5490c