So this is where STUN, TURN and ICE come in handy. ICE stands for Interactive Connectivity Establishment - and it's a overarching technique that utilizes STUN and TURN. Intro to SIP: www.udemy.com/introduction-to...
I really like how you explain these procedures quick and on point. You might raise the volume for the next video and look into the camera instead of right beside it. Maybe this is only my personal opinion, but it makes me feel uncomfortable. However good work there. Keep it up and you will eventually be noticed! Thumbs up :)