▁For ▁the ▁customer , ▁this ▁has ▁the ▁benefit ▁of ▁prevent ing ▁network ▁con g estion ▁from ▁inter fer ing ▁with ▁call ▁quality . ▁However , ▁this ▁separation ▁of ▁traffic ▁into ▁separate ▁flows , ▁or ▁Sm art ▁pipe , ▁has ▁been ▁seen ▁by ▁some ▁as ▁a ▁viol ation ▁of ▁net ▁neutral ity , ▁who ▁call ▁instead ▁for ▁equal ▁treatment ▁of ▁all ▁data , ▁or ▁d umb ▁pipe . ▁Other , ▁non - Com cast ▁Vo IP ▁services ▁on ▁Com cast ' s ▁network ▁must ▁use ▁the ▁lower ▁priority ▁public ▁IP ▁addresses . ▁The ▁practice ▁was ▁question ed ▁by ▁the ▁F CC ▁in ▁ 2 0 0 9 . ▁In ▁their ▁response , ▁Com cast ▁stated ▁that ▁services ▁that ▁use ▁tele communic ations ▁are ▁not ▁necessarily ▁tele communic ations ▁services , ▁and ▁noted ▁the ▁F CC ' s ▁current ▁design ation ▁of ▁Com cast ▁Digital ▁Vo ice ▁as ▁an ▁information ▁service ▁ex empt ed ▁it ▁from ▁tele communic ations ▁service ▁reg ulations . ▁Com cast ▁also ▁said ▁that ▁because ▁Com cast ▁Vo ice ▁was ▁a ▁separate ▁service , ▁it ▁was ▁unf air ▁to ▁directly ▁compare ▁the ▁data ▁for ▁Com cast ▁Vo ice ▁with ▁the ▁data ▁for ▁other ▁Vo IP ▁services . ▁ ▁Because ▁tele phone ▁services ▁over ▁Vo IP ▁are ▁not ▁automatically ▁tied ▁to ▁a ▁physical ▁address , ▁X fin ity ▁Vo ice ▁util izes ▁E 9 1 1 ▁to ▁help ▁ 9 1 1 ▁service ▁operators ▁to ▁automatically ▁locate ▁the ▁source ▁of ▁the ▁ 9 1 1 ▁call . ▁Vo ice ▁calls ▁are ▁delivered