I have a PANASONIC CORDLESS KX-TGA 715E cordless phone which seems to have given up the task of working. I don't know if the problem is in the handset or the base charger.
I like it and would like to replace it with something close. Plenty of handsets on ebay, though not this exact one. I imagine handsets of the same vintage would work with the same base unit, but not sure. I also don't know if the handset and base "go together" in any way.
Have you checked the batteries in the phone? They don't last forever. They appear to be a couple of rechargeable AAA batteries. A multimeter should tell you if they are charged to a nominal 1.2V. Probing the 2 connection pins on the base station should indicate if you are getting a charge voltage of maybe 5+V.
Remember that the digital phone and VOIP is here and being fully rolled out in the next couple of years. While you existing phones will still work if connected to your router or adapter box some routers now come with inbuilt answerphones and DECT base station capability giving you more options than just a new base station and handset combination.
DECT base stations and DECT handsets all should be compatible for the BASIC functions (dialling and answering calls). The incompatibility will/may come for the individual manufacturers/model extra functions. For instance you may not be able to access a answerphone message via a handset or the handset may not be able to access the address book on the base station.
I've had a 3-set KX-TG7120E for about 20 years. Replaced batteries a couple of times. That aside it's been no trouble at all. Very rarely used nowadays mind.
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