One of the talked about but not yet enabled features is some sort of in-game radio comms that will possibly use realistic range and line-of-sight constraints (like simulating a real radio transmitter/receiver).
Apart from that, what we currently have is the trusty old teamspeak and ventrillo. The way it usually works is similar to IL2, the server address for the voice software server is usually specified on the server's homepage and also within the multiplayer browser interface, as part of the server description.
Servers are joined by a built-in multiplayer browser, but the game engine also supports external tools (like Hyperlobby for example) as long as their creators take the time to code the relevant support into their clients. I think that the developer of Hyperlobby recently stated he's going to add support for CoD.
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