STUN — Session Traversal of User Datagram Protocol [UDP] Through Network Address Translators [NATs])
* Google STUN — stun:stun.l.google.com:19302
* Twilio STUN — stun:global.stun.twilio.com:3478?transport=udp #FreeForDev
* Google STUN — stun:stun.l.google.com:19302
* Twilio STUN — stun:global.stun.twilio.com:3478?transport=udp #FreeForDev