Aiphone intercom

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Location
New York
Occupation
Electric al contractor
Good morning,
We installed aiphone 2 wire intercom in 21 apartment building audio only.
1 of the tenant is hearing impaired, now I need to connect his/her tenant intercom with lights.
if someone ring the door His/her lights should blink.
I need help, how to do it. Any guidance or diagram?
Thank you
 
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