Andy is usually a great read but in this case I think that he has forgotten one of the most important parts about an IP-PBX and voice overhead - the ~ 80k load - is only applicable when someone is actually talking. Upwards of 50% of any phone conversation is actually silence - pay attention next time you're on the phone and see how much time there no one is actually talking...it may surprise you. There is actually so much silence in a typical phone call that Cisco had to artificially simulate "white noise" on their IP phone handsets so that people would stop saying “hello, are you there?” Of course, there are a number of other problems with the call going out over the wilds of the internet not the least of which is the total lack of QoS - that's a bigger problem then the limited bandwidth of a DSL circuit...and last time I checked cable modems actually had a higher penetration....though that doesn't solve the bigger problems which is most people quote DOWNLOAD
