When you call the Fonznik this is what you can expect.
In yellow - the Fonznik
In white - You, the caller
You will by identified by the number or SIP URI that you are calling from. The phone number can be a land-line number or a cell-phone number. All the numbers and SIP URIs (<you>@reg1.fonznik.com) can be added to the ANI List on the Fonznik web-app.
This enables the Fonznik to greet you, know which contact list to use, and who to bill.