Scanning my feeds tonight, I noticed an image in Jeff Pulver’s collage of Supercomm photos. Looks like a June 2005 article on peer-to-peer SIP by Kundan Singh and Henning Schulzrinne (second row of images, far right). The URL is visible, so I took a look, sure enough, a mini-site complete with architecture and implementation of a peer-to-peer SIP overlay.
The summary says, in part …
We propose a pure P2P architecture for the Session Initiation Protocol (SIP)-based IP telephony systems. Our P2P-SIP architecture supports basic user registration and call setup as well as advanced services such as offline message delivery, voice/video mails and multi-party conferencing.
On the site, there are links to some talks by Henning and Kundan on this topic, and an implementation report, whose abstract states:
Our architecture for peer-to-peer internet telephony using the Session Initiation Protocol (SIP) supports basic user registration and call setup as well as advanced services such as offline message delivery, voice/vido mails and multi-party conferencing. In this paper, we describe the design and implementation of our P2P-SIP client adaptor, SIPPeer, using pseudo code and example messages. We also explain how to use existing SIP user agents such as X-lite and Cisco IP phone with SIPPeer to participate in P2P network.
This looks to be very interesting, especially combined with the RFI issued by Henry Sinnreich at pulver.com yesterday
UPDATE: A nice piece was written on this topic in Advanced IP Pipeline. Some useful links at the bottom.
UPDATE: There’s a new site p2psip.org, that has numerous links and information on this topic, including links to IETF drafts.