Norm,

Thanks for the link--I had seen the NANPA standard, and I agree that while a standard is a great starting point, it is voluntary. I don't think VOIPo should feel obliged to support ALL of those VSC's, by any stretch. My thought is that if you intend to market VOIPo as a POTS replacement, you'd want feature codes to match up as much as possible, as it seems telcos have pretty much followed the standard. It seems that many VoIP companies have gone 'wild West' on the feature codes, and at least respecting the standards (ie. following them when it makes sense, acknowledging that they exist, etc.) is a plus in my book.