Hi Jérôme, standardizers, I saw that Jérôme had resubmitted av_conferences, and since this is an area of interest of mine, and one I sadly lack the detailed understanding to drive, I reviewed it with some interest. Firstly, this is, in my view, a major step forward and I would welcome it being published as a XEP. This is despite my suspicion that it will need more work. The main areas are around signalling for some of the cases that are hinted at. For example, bounded/demand forwarding, resolution selection, and so on. The biggest structural change - I think - is that the spec assumes that participants would get one or more SSRCs bound to them, and I suspect the "right" way to achieve a good result in the client is to bind SSRCs to UX elements; so a SSRC maps to "The 4th most recent speaker", or "This pinned particiant", for example - and the Focus then instructs the SFU to map an inbound stream to that SSRC accordingly. That implies that <origin/>, which maps to the <content-add/> set in Jingle, would need to be replaced with something that's part of the <description-info/> instead. Obviously this is all with the caveat that I have no idea what I'm talking about, really... But, I would really love to see interoperable multiparty calls in XMPP. Dave.