There is a potential for service problems with add on voip providers such as Vonnage and Magic Jack, they are considered to be regular data customers, while voip from an MSO is given priority over other traffic on the network.
Never argue with an idiot, they will drag you down to their level and beat you with experience. Winston Churchill
This is CABL.com posting #210608. Tiny Link: cabl.co/m2W4