I race my CLI vs your GUI any day on any of a list of tasks and see who finishes faster and has them all done correctly.

If you can get access to change a name on a digital or IP Phone type "plis 1 0 2 EXT" where EXT is the extension number you want to chage
Analog phone would be "plis 1 0 1 EXT" Careful alot of people think they are Calling "Joe at 500" because the phone tells them Joe when they dial 500 if you get an error with the plis commands. 3 places to check would be Hunt 0 EXT; BOSS 0 EXT; and LIB 0 0 EXT, These can all ring extensions and have unique names.

Too Much ?? Get a Certified Tech.