I teach middle school in Kansas City, and one of my students is working on a science fair project that involves testing the working distance of cordless home phones.

We'd like to experiment at our school, but the school has a phone system where each room has its own extension on a large network (816-418-XXXX). Is it possible to use a cordless home phone on such a system and call it using the room extension? Phones really aren't my area of expertise, so any help will be greatly appriciated.