Fire Alarm System Dialers

Given 20 buildings on the same property that require fire alarm systems, is it more reliable for each building to have its own CP and telephone dialer than to have one CP and one dialer at one building communicating to a required central station? I know it's less money to have one CP and 2 phone lines for this many buildings under same ownership, but is each building alarm system more reliable to communicate to central station with there own dialers?
Original Post
If each building has it's own phone line direct to the phone company trunk line, then separate dialers with separate phone line is the most reliable.

If each building is wired on site to a master phone set then to the phone company trunk line, then there is no higher reliability for each building to have it's own dialer.

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