StartVoteMap
From the Scripting Manual
procedure StartVoteMap(voter: byte; mapname: string); Parameter Info: voter (Byte): Player ID of the player who will appear as the Vote Starter. mapname (String): Case sensitive name of the map to be voted, excluding the .PMS file extension. Description: This function will start a map vote for (mapname) and will appear as started by (voter).
Examples
StartVoteMap(1,'ctf_Kampf'); //Start a map vote for ctf_Kamf from player 1