For Xbox there not voice activated i think. I havent played xbox live in a long time, cuase i play it at my friend. U push a button to talk. He probably had his hand on the button when he fell asleep lol
lol maybe he just left tha game and fergot to like come out lol HOW THA HELL CAN SOME ONE FALL ASLEEP DURIN A GAME LOL
If people are within a certain radius they can hear you without pressing the white button. This is very old yet very amusing