Last year we purchased a brand new industrial/office building in Orange
County, CA. The building came with fire sprinklers installed and there
is also a phone line dedicated to call 911 should a fire occur. We are
paying for this phone line apart from the regular phone lines that we
are paying for our normal office use.
I am wondering if there is any mandatory code requirement to have this
fire service phone line standby at all times? Or is it OK to disconnect
this phone line service, but of course, keeping the sprinklers.

Any tips are welcome.

Thanks