http://planetquake.gamespy.com/View.php?view=Guides.Detail&id=48&game=4/callvote [proposed vote]
This command can be used to propose changes on a server, and allow all the players on the server to vote on it. This can be used to change maps, game modes, settings, and even kick players if necessary. To vote on a proposed change, press F1 to vote "yes" and F2 to vote "no".
Examples:
callvote map q3dm9
callvote g_gravity 100
callvote kick sluggo
You can also type /callvote by itself to see other options.
(callvote nextmap
callvote map_restart)
This command may not work on all servers. Also,
other players may not like you for using it. Be careful.
On some servers, this may not work at all.