If you order IP Desk Phones from Solgari as part of the solution, they will be delivered pre-configured and will light up with the correct extension to the particular MAC address on the phone, once plugged into your network. You will be provided a list of the provisioned extensions against the MAC addresses and your IT Support or other personal on site should set the phones up on each desk to match each extension.
To set the phones is very simple and please see demo videos below.
T20P & T22P
T26P & T28P
T32G & T38G
T46G & T42G