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How old is your Panasonic phone system?
Also, are these two handsets, connecting to the same base unit?
And when did this problem first occur?
Hi thank you for that info.
The first thing I would do to rule out an electronic component failure is to reset everything including the Avaya system.
Remove any batteries these phones may have and then unplyg all of them for their respective phone lines and power supplies or turn off the power at the main for 30 full minutes. Then you can replace any batteries in this system and re power the units then replace the phone lines all in that order.
Please let me knwo if that solves the issue?
If it does great!
Then please rate kindly. But if not, do not rate yet but please let me knwo and I will go further with you on this problem.