W80 and W90 GAP compatibility

[Xerox]

Not found a specific DECT multicell subforum, posting here...

Are W80 and W90 DECT systems compatible with standard GAP profiles , thus usable with third party cordless phone ( Gigaset, Panasonic, Innovaphone and so on...) ??

Are by the same principle Yealink WXX dect phones usable in other brands multicell systems ?

I'm planning to use Yealink W90 as "default" DECT system for VoIP pbx, I have high demand to keep already working almost new non-Yealink handsets.

Thanks.