The seventh patch for F1 2012 is now available via Steam, upgrading the PC version of this racing game published by Codemasters. It adds a Push To Talk option - this can be turned on in the Audio Options (My F1 -> Audio) and is bound to T by default. The key used can be edited in My F1 -> Driving Controls -> View / Customise Profile.
The patch also adds a Disable All Voice Comms option. This can be turned on in the Audio Options (My F1 -> Audio) and will disable all outgoing and incoming voice communication.