Aiphone Intercom Door Release With Existing Access Control

Client has 2 doors with door strikes tied into a larger access control system. They want the concierge to be able to open those doors manually, while still keeping the card access for residents.

I am trying to think this out.

Would I have the Aiphone trigger the same power supply that normally powers the doors?

Or would I provide a sperate power supply to trigger the strikes? Somehow I think that either way, I send power back to the device, not in use. If the access control and Aiphone are both tied to a relay, when the Aiphone sends a signal to the relay, that small voltage will work its way back to the access control unit.

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