Re: [MMUSIC] Bundle, TURN and Legacy Interop
worley@ariadne.com (Dale R. Worley) Thu, 14 March 2013 19:30 UTC
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Subject: Re: [MMUSIC] Bundle, TURN and Legacy Interop
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> From: "Hutton, Andrew" <andrew.hutton@siemens-enterprise.com> > > It seems that one of the motivations of the current bundle-03 > proposal is that the first offer is compatible with a legacy device > and that a second offer is required for bundle (See > http://www.ietf.org/proceedings/86/slides/slides-86-mmusic-9.pdf) It seems to me that this is suboptimal from the point of view of connection establishment. It's not difficult to arrange an offer that is compatible with both a legacy endpoint (except for perhaps TURN ICE candidates for the fallback "constituent" ports) and with a supporting endpoint. The essential thing is to have a separate bundle m= line so you can in effect offer both the bundle and the constituents simultaneously. If the offerer discovers that it is talking to a legacy endpoint, it can update the offer with TURN ICE candidates for the constituent ports. (If the offerer doesn't want to have to reoffer for legacy endpoints, it can preallocate enough TURN candidates.) The result is that you can establish communication with supporting endpoints in one offer/answer cycle, and the offerer chooses between needing a reoffer for legacy endpoints when TURN is required vs. preallocating enough TURN relays. I don't see a reason to optimize the offer/answer technique to slow down connection to supporting endpoints and speed it up for legacy endpoints. Dale
- [MMUSIC] Bundle, TURN and Legacy Interop Hutton, Andrew
- Re: [MMUSIC] Bundle, TURN and Legacy Interop Christer Holmberg
- Re: [MMUSIC] Bundle, TURN and Legacy Interop Hutton, Andrew
- Re: [MMUSIC] Bundle, TURN and Legacy Interop Dale R. Worley