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Alexa would have been ideal, unfortunately, her voice is a bit too quiet and shaky for voice recognition, she does have Alexa already, but she doesn't use it as it doesn't work for her.
She also has an emergency call line that works fine but not for phone calls except in an emergency.
I agree The Builder, it should be very simple, but nobody seems to do it! An opportunity for a business for somebody for sure, it's a situation I have come across a few times, there must be hundreds of people out there looking for something similar. If I was a bit younger and not so busy, I would look into setting up such a service for sure!