License usage for product Windows Server is nearing the maximum number of per server licenses purchased

I'm getting the following error message:
License usage for product Windows Server is nearing the maximum number of per server licenses purchased

I go into server management and it tells me I have 30 installed license.  It also says I have 18 maximum usage.  Are they telling me I can only use 18?  We never have more than 30 people logged in so I'm not sure what to think.  

Thank you.
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If your server has thirty CALs, and you will never have more than thirty concurrent logins, then you have nothing to worry about.

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SCarroll9025Author Commented:
Do cell phones count - or is it just computer logins?
Any time a client accesses the server, it uses one CAL for the duration of the login.  Short answer- if you have to log in, you're using a CAL until you log out.
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