Voice Chat in Online Games - New Revolution in MMOGs

There's a lot you can do in pervasive online worlds like Second Life or World of Warcraft, but the one thing that's missing is integrated voice.

But now Vivox is readying an in-game voice service that may help draw players into games and keep them engaged, rather than serving as an open door to other worlds.
For Eve Online, Vivox is integrating voice directly into the game's interface, for rollout this fall.
And one voice feature planned for later release will actually call players back into the game. Voice messages sent in-game will relay to the real world, so impending battles can be met with calls-to-arms to team members not even logged in.

- Deepak Abbot