OTT

over the top voice, over the top video
voice communication that never touches a traditional telco’s VOIP switch?
video viewing that is 100% over the public internet and never touches a cable operator’s head end

voice voice over Wifi?

How much voice traffic goes 100% over the internet. This voice never touches a traditional telco’s VOIP switch?

over the top voice

OTT voice over 4GLTE or WiFi