Hello,
on Ascom DECT 800 we had also no handover-functions ! , also with different Handsets. But with some other it works.
But then we tested a new Dect-Station with multi-site funktion ( more subnet funktion for different locations ) and there we have also verry good handover function
and can use this Handsets in different "Subnet-locations" without reregister them, they will moved automaticly to the new logged in Dect-stations.
Also we had activated a central Phonebook ( XLs or SQL possible ) for some dedicated phones and the performance is good.
We would test them more, and then give an information in PPT of Swyx .
For "untested" versions please contact me directly for further informations.
Frank