In order for Users to make calls they will need an IP phone. This could be a physical IP phone which sits on a desk, or a softphone which is loaded onto a mobile, tablet, or computer.
In order to allocate an IP Phone to a User there is a secure activation process. Once set-up, the user account is linked to the device. For a physical IP Phone we use a MAC address (this is a unique number which identifies that particular phone). For the BT Cloud Voice 'App' there is a username and password which is set up using the BT Cloud Voice portal.