From a classroom wall phone dial 2600

If you have a 5330e display desk phone, press voice mail button  - # 4 in image

Temporary voice mail pass code is 12345 - after entering, 

please wait a few seconds  until you are told to enter a new pass code.

Follow voice prompts as instructed.

Please note: When you are in your voice mail box -  option # 6 - to change name of phone.