Why my answering system refuses to my recorded greeting?

I have used the the Dect 6.0 answering system for several years as an extension to my Panasonic 2 Line Desk phone. Just recently, the unit has given a mechanical greeting instead of my recorded greeting. I disconnected the uniden and the panasonic gave the recorded greeting. The Dect 6.0 will not.

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Hi,

What is the model number of the Panasonic phone and the make and model number of the answering machine?

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