I'm looking into a notification device for a small school. In case of an intruder, attack, etc., they want something in each classroom that a teacher can press and run, that will make an announcement to the rest of the school.

They have a Nortel MICS phone system, with a phone in each classroom.
There is a single Valcom page horn in the gym, accessed via the Nortel's page port.

I've looked at the Viking DNA-510. Looks like it would work only for the page horn. Anything available to also allow a prerecorded message to the Nortel phones?

Thanks.
Jim