This has lowered my ping by 14. It was 46 and is now 32.
Turning on the console.
-Start by opening the game.
----Then go to "Options and Controls"
----Select "Game options"
----Select Yes in enable console
Increasing the max packet flow. (DO NOT BE IN A GAME SERVER)
-At the main screen of Call of Duty Press "~" tilde
----Then enter the following "cl_maxpackets 100"
Now i cannot guarantee this will work for everyone and not all ISP's will allow this. But like i said it lowered my ping by 14
This info was given to me by GunnerB1