I always install my own strikes and power supplies so I guess I should go into a little more detail here. I use timer relays on the strikes so a pulse will trip the time delay relay and hold it for 5 to 10 seconds.
I believe a timer relay should always be used regardless of the release method, whether it be paging contact, ringer, or a simple button, it should be a consistent time. If you use the paging method and accidentally don't hang the phone up, the strike will stay engaged and depending on the duty cycle of the strike, it could burn out.
