Comcast is essentially a VOIP service. I am pretty sure that the Bluebox won't work well with it. Similarly, you can't run a fax machine (same basic technology) over VOIP. The data doesn't like being re-converted over a G.711 codec. Kevin Kidd wrote: > Hi again, > > I am full of odd ball questions this week. > > I have a client with 3 Comrex POTS Blue Boxes