you can setup the /tftpboot directory, on your S8300 or S8500 to have the firmware for the 4600 and 9600 IP phones, you can edit files (such as the 46xxsettings.txt file using "vi"), you can move files around, look at logs from CM, there are thousands of reasons for learning a little bit (or a lot) of linux when you start working on AVAYA's S-Series servers.
mitch
AVAYA Certified Specialist