I wanted an alternative to skype for video calls for android. Have read some articles, however, "advertised" viber and telegram do not support video now.
In this question Video call to iPhone (FaceTime) via Windows, Android, or web , https://apprtc.appspot.com/ was advised, I've tried and got about 4 seconds delay.
But situation could change and I'd like to save time on trying one app after another. Please advice on now working with smallest delay p2p video calls app (no file sharing etc. needed) for android that is now free and better have variable video quality options in case of limited traffic volume mobile plan.