Paul Stewart from PacketU comments:

For those that haven’t realized it, our Internet is sort of broken. Intended to be a peer to peer network, this global network has become a network that primarily operates in a client/server mode. Fortunately, this works very well for many use cases. However, there are applications that would work much better in a network that is truly peer to peer. Voice is one such application.

Read more at: Ubiquitous IPv6, A Killer App for VoIP?