<human>: Condense the text into a few key points

Relevant:  I work in public education. I am salaried, working as an administrator in a technology department. My job description includes the phrase "Must support 24/7 uptime". 

There have been some situations where I have been expected to work while I am out on a sick/vacation day. Once I had to work while hospitalized. No one has ever threatened my job, but things have been worded in such a way that I had no choice but to log on. 

How much leeway does my employer have in this situation? Does my job description ever trump approved time off?   

Also-- I have a work cell that must be on and with me at all times. I see no extra compensation for this.  Is this requirement even legal?
<bot>: My public school employer expects me to work during sick and vacation days because I am salaried. What recourse do I have?