Title: Don't Buy More Than 1
Product review: Before I purchased the units I called ttsystems the distributor to make sure there would be no compatability issues using more than 1 unit. I needed 5 but chose to buy just 3 in case there was a problem and there was. They do not display Call Waiting ID because all 3 are trying to send the siganls back to the switching station at the phone company at the same time, a problem that I was afraid of but was told by ttsystems did not exist. My phone service is provided by Verizon and is about as industry standard as you can get. The Call Back feature also does not work with multiple units. If you need Call Waiting Caller ID Displays and you need more than one this is DEFINITELY NOT the unit for you.
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