▁T ET RA ▁network ▁for ▁the ▁duration ▁the ▁end ▁user ▁conser ves ▁the ▁terminal ▁under ▁his ▁possession . ▁ ▁Status ▁SD S ▁provides ▁the ▁end ▁user ▁with ▁a ▁mechanism ▁for ▁generating ▁a ▁ 4 4 0   Hz ▁repeating ▁tone ▁that ▁signals ▁a ▁fra ud ▁occurrence ▁to ▁members ▁within ▁the ▁same ▁( dynamic ▁or ▁static ) ▁Group ▁Short ▁Sub scri ber ▁Identity ▁( G SS I ) ▁or ▁to ▁a ▁specific ▁Ind ividual ▁Short ▁Sub scri ber ▁Identity ▁( I SS I ) ▁for ▁the ▁duration ▁of ▁the ▁assignment ▁( an ▁hour , ▁a ▁morning ▁pat rol ▁or ▁a ▁given ▁short ▁period ▁allocated ▁to ▁the ▁assignment ). ▁The ▁advantage ▁being ▁that ▁each ▁of ▁the ▁end ▁users ▁may ▁attach ▁themselves ▁to ▁any ▁given ▁terminal , ▁and ▁group ▁for ▁short ▁dur ations ▁without ▁requiring ▁any ▁major ▁re configuration ▁by ▁means ▁of ▁radio ▁software ▁programming ▁tools . ▁Similarly , ▁the ▁ag gression ▁feature ▁functions , ▁but ▁with ▁a ▁higher ▁tone ▁frequency ▁( 8 8 0   Hz ), ▁and ▁with ▁a ▁quick er ▁repet it ious ▁nature , ▁so ▁to ▁highlight ▁the ▁ur gency ▁of ▁the ▁alert . ▁ ▁The ▁parameters ▁tab ▁provides ▁an ▁essential ▁means ▁to ▁the ▁terminal ▁end - user ▁allowing ▁them ▁to ▁pre - configure ▁the ▁target ▁( pre program med ▁I SS I ▁or ▁G SS I ▁) ▁destination ▁communication ▁number . ▁With ▁this ▁pre - program med ▁destination ▁number , ▁the ▁end - user ▁shall ▁l ia ise ▁with ▁the ▁destination ▁radio ▁terminal ▁or ▁roll ▁allocation ▁server , ▁and ▁may ▁communicate