The telephone operated as advertised when we tested it at our home.
HOWEVER, when we installed it at my hard-of-hearing mother-in-law's home, it did not work well. There was a great deal of background "noise". Tech support first advised us to verify that the transmission line was analog, vs. digital. The phone only works in analog format. (A Radio Shack salesperson informed me that, even if the transmission line was digital (e.g., Fios), there is a box outside the house which would convert the signal to analog.) I confirmed that the transmission was in analog format. Back to the tech. support, who advised me that there must be a lot of interference (or noise) in the transmission line. The phone amplifies the noise as well as the speaker's voice. Makes sense. She advised me to get a DSL filter (Radio Shack - $14.95). I installed it and it did reduce the noise somewhat, but not enough to make the conversation easy to hear, even to the non-hard-of-hearing ear.
Unfortunately, I had to return the phone.
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