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Title: affected all my other phones
Review: I ordered this phone as an extension for my base unit. I registered it and it worked fine for one day. The next day, all my phones were echoing and the new handset faded in and out and nobody could hear me on the new handset. I had to return it and deregister it, but my phones still haven't returned to the previous normal state. At this point, I don't know what to do.
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