You could use a paging adapter that will close a contact via vox sensor. Look at Bogen, Valcom or Viking - they all have something that you can make work for this application.
Basically its a standard page port on a nortel system, it's connecting to a bogen 70v amplifier. I am looking for a way to activate a strobe light whenever someone is paging.
Or use a matching transformer to connect 70V to input of page adapter (MUST (must) use an appropriate matching transformer!). Many page adapters support closing a contact on sensing voice - often with some adjustment. Granted, this is now how page adapters are designed to be used - but there's no reason that it shouldn't work.
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