Ahha. It has not happened to me so far. Right now, it won't happen because I have this flashing light to alert me that the phone is ringing and so forth, so I can answer the phone myself without depending on a hearing person.
If you need more research on finding flashing lights for doorbell, phone ringing, and so forth, you can find them online. Hearmore.com is one of them. HarrisCommunication is another. There are so many manufacturers and distributors everywhere in the world online. Good luck. 
