If you turn off the E911, your address still shows up on the screen of the emergency dispatcher. If I am not mistaken, the E911 is used to identify which building you are in when you have multiple buildings on the same switch.
If you had three buildings all run by one 672 and entered the correct address for each building by extension, then the correct address would go out for each phone by extension that is dialing 911.
If you have a CIX100 in a little 400 sq foot apartment, you would have no use for the E911 unless you had an extension in the outhouse and it caught fire while taking care of business.
