Sadly no, Doomsday does not implement native VoIP support for multiplayer chatting. However it should be possible to use third-party services such as TeamSpeak.
VoIP integration would certainly make for a nice plugin project, however, should someone want to give it a shot. :-/
Another similar program is Mumble ( http://mumble.sourceforge.net/ ). Mumble also can be integrated into a game to support positional audio. Perhaps the Doomsday devs could consider this as a future feature. But even if not integrated into the game, it still can be used for live chat during gameplay.
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VoIP integration would certainly make for a nice plugin project, however, should someone want to give it a shot. :-/
[:) =D> )