Vivox will Provide Voice Chat for World of Tanks

Overlord: Bulit-in voice chat will be available for platoons (one channel per platoon) in standard battles and in team mode as well (one channel per team). No premium account required of course to use it, apart from tha fact that premium is required to create a platoon/team, ie at least one person should have it.
It will be push-to-talk system, that can be disabled completely from game menu.