A year ago I bought a reconditioned Panasonic KX-TG200. The microphone
was bad. People had a hard time hearing me. I shipped it to a repair
station under warranty. They replaced the mic and it has worked well ever since. I had to pay shipping to them. Return shipping was free.
I think that the problem with cordless phones is the quality control!
It seems like no two are the same. Well, that maybe an exaggeration but...
e-town.com has ratings on various phones...FYI