I only have 1 telephone line to choose from so I will go into it. You will notice a red flag on the right of the page. This means that the extension is unregistered. If the phone was registered there would be no flag and if there is a green flag it means the phone is on a call.
Under the telephone line you will see there is a field called “If unregistered, forward to”. In this field put your mobile or another phone you want to forward to. This will forward off your calls when your internet is down. Once down go to the bottom of the page and press save.
Input your search keywords and press Enter.