DECT Multicell support

[Melvin_XIII]

Hello,
I have a similar issue. We love the Yealink W56P handset and e are willing to go a long way in order to use these handsets. However the Base is not flexible enough for our use.
We have Have 15 Yealink W56P and 4 Jabra DECT headsets that we need to connect to a DECT system which is then connected to a PBX (3CX). The area we need to cover with DECT is too big for just one Base station. We would also like to be able to walk from the reception area of one base station into the area of another without loosing the connection. This means registering the handsts at two station isn't a solution.
Because of the number of devices it is also not a good solution to use 3 base stations each with a repeater.
I would like a multi cell setup. Because Yealink doesn't have one I am looking for others that are compatible with the Yealink W56P.
I have read that there are problems with Gigaset base stations not registering properly. Does the Gigaset N720 work? Does the Snoom M700 work? are there other options worth looking at.
I am at a dead end here. I would appreciate any help I can get.
Thank You,
David Schumann