... Call pickup, paging. 4.Function of Key Phone-Hand-free, Redial, Conference, Hold, Memory, Monitor, and disconnect ... __ for Co. Line holding. “LINE ”– for fetch a free Co. line. “INT”- for internal calling “TRF” __ ... number redialing “ ” - Increase the volume of hand free, handset, and ringing. “ ” __ Decrease the volume ... of hand free, handset, and ringing. (6)The adjustment of ...