Gliby's Voice Chat Mod 1.8, 1.7.10, 1.7.2 allows you speak with other players in Minecraft, if the other player are far away you won't hear the them, nor can you speak to the them.

Gliby's Voice Chat is a mod for one goal, to get rid of typing to talk, imagine you and group mining, when suddenly a creeper sneaks up on one of your members, if not for Gliby's Voice Chat Mod you couldn't warn him as fast, he would probably die.