It looks like the concept of peering is being taken seriously in the cable industry, or at least in the Netherlands it is.
Yesterday SIPX, the world's first cable telephony peering federation project was announced and XConnect along with others are driving this.
I've long been saying privately that one of the issues many of the VoIP companies have is their lack of proper peering relationships, and how important to things like call quality, call set up and tear-down, as well as other things that are important and remain in the signaling path to make the call complete and sound right.
By taking this first step, the Dutch cable industry is acknowledging the importance of making sure there's a neutral hub that allows the telephone calls made over one cable MSO to pass to another with all that's necessary to sound good, be completed quickly and to maintain all the functionality (like DTMF, Caller ID, etc.) that the regular telcos have and more.