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Two-way communication system circuits

Question asked by yesongs on Jun 16, 2020
Latest reply on Jun 19, 2020 by blair

NFPA 72 in 24.8.6 mandates that:

"Two-way telephone communications service shall be capable of permitting the simultaneous operation of any five telephone stations in a common talk mode."

In my case I have a UL listed panel, providing this function but ONLY for one circuit, while in the building there are 3 circuits each one for each of the stairs (telephone jacks in the stairs according local AHJ requirements).

Should the people being in different stairs be able to communicate with each other?