Bought one of these to use with BT Digital Voice, as the Cloud Voice Express app is useless (kept missing calls on Android).
We can now use our DECT system in the office again so that we can transfer calls etc.
Only thing to note is that they will need a firmware update before plugging in to the BT Business Hub, otherwise you'll need to get BT technical support to associate the unit's MAC address to your 'landline' phone number.