[DiThi]

Shaping is not a problem at all. The problem is how you decide that shaping. If you're client of a network and you pay more for more priority inside that network they can do that, but as soon as the packet leaves it, it should have the same priority as anything else. And in practice you should never need such a service, as long as there's enough capacity. QoS can prioritize VoIP traffic without having to look to the source, destination or content. There's many clues for that which don't rely on having a list of source/destination tables or content matching.