Web User Interface
Advanced - Behavior (Tab) - Phone Behavior (Section): Auto Dial Target
Phone User Interface
Settings → Call Features → Outgoing Calls → Auto Dial
Together with auto_dial, this setting is intended for phones used to dial one number only (in waiting areas like airport lounges or in waiting rooms, for example) by simply picking up the receiver. The phone will dial the number when the number of seconds specified in auto_dial has elapsed since the last digit was typed.
An IP address :e.g. <126.96.36.199:5062> or a valid phone number or extension