This is an easy change, but see if you can find out the reason as there may be a better way to do what ever he wants to do.
Making this change could cause other thing not to work any more like Speed Dial lists, NCFW on ACD groups, Auto Dial Keys.
So again YES this is an EASY change, but do you really want to do it????????
This is a Signature and not part of the answer, it appears on every reply.
This is an Analogy so don't take it personally as some have.
Why change the engine if all you need is to change the spark plugs.