StartVoteMap
From the Scripting Manual
procedure StartVoteMap(Mapname, Reason: string); Parameter Info: Mapname (String): Case sensitive name of the map to be voted, excluding the .PMS file extension. Reason (String): Text that will appear as the reason of the Map Vote. Description: This function will start a map vote for (Mapname) and will appear as started by Server with the (Reason) as a reason.
Examples
StartVoteMap('ctf_Kampf', 'Time to spray!'); //Start a map vote for ctf_Kamf