“I have a very similar looking older model ATT DECT 6.0 model TL92278 with serial number ending in 1539917 and was wondering if this expansion headset phone would work fine with the older model base since the headsets and batteries are going bad?”
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I bought the extra handset and all I had to do was to set it on the Base Unit for the new 3 handset system for a few moments. It connected fine and works in perfect coordination with the 3 set unit. Hope that helps.
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