Earlier quoted context omitted.
Sorry you missed some steps there: - Just set up a sip server with appropriate SRV records in the DNS. - Discover that you also need A records (that now collides with webserver on your domain), because not every client supports SRV. (and some also need NAPTR) - Discover that half of the phones are not compatible with your server out of the box. - Discover that to support vendor A you need to enable X and to support v…
Yeah. I also didn't supply server setup instructions and service configuration examples. Sorry. We do have a distributed voip network. But yes, it does need work to improve it. Skypes simplicity is what makes it so popular.
XMPP/jingle is in a much better position to be the distributed answer. SIP is not.