It really depends on how many stations and how far they are away. Generally speaking, it you are feeding just 1 or 2 stations, ISDN is a cheaper route @ about .25/min long distance. You can do the math on equip/toll charges, but by the time you hit 3-4 stations, the sat time + ISDN to get it to the uplink is cheaper. The sat time can be had for $95 - $110/hour.