My KX-TGA651E phone works properly on outgoing calls but in incoming calls, I can't hear the caller but they can hear me and I get an echo of my own voice. My other Panasonic phone works perfectly.
The first phone is on the original base (both 15 years old). This one is another Panasonic phone but a different model - usually they'd all be compatible and it is to the extent that the base recognises it. The base also allows incoming and outgoing calls but the incoming calls have no audio.
I'm wondering if the new Virgin Media phone system has put a spanner in the works.
The problem with different bases/handsets is that they may not be coded between the base/handset if they are of a different version
if they were universal, it would mean that you would be able to use a neighbour's phone connection to make calls.
Manual for the version you have
Before spending a lot on a new system check if the issue still occurs with a single corded handset plugged into the master socket/hub depending on which system you are on.
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