HUMAN VERIFICATION REQUIREDASVS 17.1.1 TURN destination restrictions (when webrtc is used)
MB-C16ASVS Level 2 Contextual Human AssuranceHigh
The Traversal Using Relays around NAT (TURN) service only allows access to IP addresses that are not reserved for special purposes (e.g., internal networks, broadcast, loopback). Note that this applies to both IPv4 and IPv6 addresses.