If steam version go to: C:\Program Files (x86)\Steam\steamapps\common\911 First Responders\Mods\Los Angeles Mod v2.1\Specs  where ever you have the game installed, in there look for these files  fp_params_challenge fp_params_endless  and you can set the calls 0 = off and  1=on also
 
	TO edit files use notepad or notepad++ just right click the files you want to edit and click edit
 
	you can change this to if you want:  
 
	 
 
	<MinDurationBetweenEvents value = "350" /> SET THIS HIGHER if you want calls to come in slower 
	    <MaxIdleDuration value = "100.0" />  SET THIS HIGHER to 
	    <Seed value="0"/> 
	    <BuyFactor value="10.0"/> 
	    <SellFactor value="0.5"/> 
	    <GlobalEventFrequencyFactor value="1.0"/> 
	    <TimeSpeedFactor value="0.0"/> 
	    <StartBudget value="1500000"/> 
	    <MaxBudget value="500000"/> 
	    <Earnings value="5000000"/> 
	    <SquadPriceGrowth value="30.0"/> 
	    <MaxParkingSpace value="150" /> 
	    <InitialEventFrequencyBoost value="100000.0"/> 
	    <InitialEventWaitDuration value="400.0"/> 
	    <starttime value="13:00"/> THIS is the time of the day 
 
	 
 
	Hope this helps