). ▁ ▁Emer gency ▁calls ▁Von age ▁offered ▁ 9 1 1 ▁service ▁on ▁a ▁Vo IP ▁platform ▁for ▁the ▁first ▁time ▁in ▁ 2 0 0 3 . ▁For ▁ 9 1 1 ▁location ▁services ▁to ▁work , ▁subscri bers ▁must ▁activ ate ▁the ▁ 9 1 1 ▁calling ▁feature ▁by ▁register ing ▁their ▁full ▁address ▁with ▁the ▁company . ▁Custom ers ▁are ▁responsible ▁for ▁maintain ing ▁their ▁ 9 1 1 ▁location ▁information ▁at ▁all ▁times . ▁ ▁If ▁a ▁customer ▁d ial s ▁ 9 1 1 ▁before ▁the ▁ 9 1 1 ▁ver ification ▁is ▁completed , ▁the ▁call ▁will ▁usually ▁be ▁rout ed ▁to ▁a ▁national ▁ 9 1 1 ▁call ▁center ▁where ▁basic ▁information ▁must ▁be ▁given ▁( name , ▁location , ▁nature ▁of ▁emer gency , ▁etc .), ▁after ▁which ▁the ▁call ▁is ▁transferred ▁to ▁a ▁local ▁public ▁service ▁answering ▁point , ▁like ▁a ▁local ▁Police ▁Department . ▁ ▁Qu ality ▁of ▁service ▁and ▁equipment ▁compatibility ▁Vo IP ▁service ▁re lies ▁upon ▁consistent ▁broad band - IS P ▁u pt ime ▁and ▁Vo IP - equ ip ment ▁compatibility ▁with ▁the ▁I SP ' s ▁mode m . ▁Although ▁Vo IP ▁was ▁initially ▁optimized ▁for ▁voice , ▁some ▁f ax ▁equipment ▁can ▁be ▁operated ▁over ▁Vo IP , ▁but ▁compatibility ▁of ▁monitor ed ▁alarm ▁systems ▁and ▁other ▁devices ▁is ▁less ▁certain . ▁Von age ▁offers ▁" spe cially ▁commission ed " ▁F ax ▁Line ▁service . ▁Von age ▁recomm ends ▁customers ▁keep ▁a ▁basic ▁traditional ▁land