Hi, On Mon, Mar 3, 2008 at 7:55 PM, Bruce Lowekamp <[EMAIL PROTECTED]> wrote: > On Mar 3, 2008, at 1:23 PM, Henry Sinnreich wrote: > > > Ted, > > > >> The overlay ends up being a path of last resort > > > > Having the media go over 5-10 hops, some of which may pass via several > > continents due to the hashing in the DHT makes such real time media > > worthless due to the delay and cut-offs. > > > > Bruce: Can you comment on this? Reload-03 has no clear text on > > symmetric > > routing for media. > > > > I think that's because we assume a TURN server will be used, if > necessary. I'm somewhat in Ted's camp of "it will be used as a last > resort, regardless of what the draft says" although I think some of > my fellow authors would like to require that implementors explicitly > prevent it from happening.
I don't want to take part in the discussion about media routing across the overlay, I think this is out of scope for now. As far as I see, we are defining a signaling protocol (control plane), but we are keeping in mind that it will have implications for other planes (media, management), this is why we assume a TURN server will be used. Anyway, I fully agree with Ted: "Not all media, and not even all SIP-arranged media, are necessarily real time". For example: - overlay may need to store (and replicate) user's profile, user's (public) keys, and so on - IMHO, offline message delivery is a desired feature. We may need to replicate such information within the overlay By the way, when talking about real-time media, are you considering p2p media? (e.g. chunk-based multisource media delivery) > I think Henry's point that geography comes into play is very > important here. Henning has proposed that AS number be included in > selection of a TURN server. I'd use other term rather than geography. Some kind of performance diagnose may be used to to decide which server/relay to use in which context. Thank you, -- Victor Pascual Ávila Research Engineer Tel. +34 93 542 2906 Fax. +34 93 542 2517 Research Group on Network Technologies and Strategies (NeTS) Universitat Pompeu Fabra (UPF) Pg. de Circumval·lació, 8 Office 358 08003 Barcelona (Spain) http://nets.upf.edu/ _______________________________________________ P2PSIP mailing list [email protected] https://www.ietf.org/mailman/listinfo/p2psip
