How can I protect my mother's land line phone from fraudulent and scam calls?
I manage my elderly mother's AT&T land line telephone account. She lives in an assisted living community in Tennessee. She can successfully call family members and successfully answer incoming calls, but she cannot operate the answering device nor screen incoming calls, and she cannot reliably discriminate between legitimate phone calls and fraudulent scam/phishing calls. Her telephone number has always been regisered on the national do not call registry. I am seeking a solution to restrict or at least reduce incoming calls so that only specific telephone numbers can call her telephone.