Phone provisioning or auto provisioning is an easy and time-saving way to configure IP phones for IP PBXs. With phone provisioning, all user information can be entered via the IP PBX web interface. Required is the MAC address of the IP Phone, the desired extension and the caller ID which is displayed on the called party phone display. The IP Phone receives the configuration via the local network. This offers many advantages, i.e. it is possible to configure phones centralized, which saves a lot of time and money.