Poly headset swyxit compatibility

Hi

We have a customer who prefers Poly headset and working answer key is important.

Is the answer key working with swyxit and Poly Savi headsets ? 

https://www.enreach.de/de/produkte/drittanbieterprodukte/audio-geraete/poly-dect-headsets

Do you have any experience ?

Thanks for advice

//Jan