I have recently got ftp with a Business Smart Hub 3 and the Cisco desk phone.
Is there a cordless phone I can add to this? Would the BT essential VOIP phone work with this set up?
Install the BT Cloud Voice Express app on your mobile then you will have your business number on your mobile as well as your Cisco desk VOIP phone. When someones calls both will ring and you can answer on either Cisco or mobile. Mobile also works over mobile data when out of office etc.