Star Trek Online is the latest MMORPG to receive the integrated Vivox voice chat treatment. While players are still a few years short of tapping their command insignias and barking out orders to their party, it's a step in the right direction.
The system allows team and fleet members to chat directly without the need for third-party servers or software such as TeamSpeak or Ventrilo. Joining a channel is automatic when you group with other players, and the implementation features the usual configuration and customization options (including, of course, a push-to-talk binding and the ability to disable the service entirely).
Read all about it at the official STO website.