There are three call‐forwarding options.

To access all three options, click the Options button then click Call Forwarding in the Options dialog box.

Turn off call forwarding – calls will ring in Skype for Business and your desk phone.

Forward my calls to – sends calls directly to voice mail, another number, a Contact, or a Delegate.

Simultaneously ring – calls will ring in Skype for Business and your desk phone, while also ringing at another location that you set. Simultaneous ring must be selected to use the Skype for Business Mobile App.