Re: [MMUSIC] Bundle offer with different ports - where to expect media?
Suhas Nandakumar <suhasietf@gmail.com> Thu, 23 May 2013 08:43 UTC
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References: <7594FB04B1934943A5C02806D1A2204B1C374357@ESESSMB209.ericsson.se> <519A1336.9010001@jitsi.org> <9F33F40F6F2CD847824537F3C4E37DDF1159D127@MCHP04MSX.global-ad.net> <519A229D.7090204@jitsi.org> <7594FB04B1934943A5C02806D1A2204B1C374463@ESESSMB209.ericsson.se> <519A2768.5010904@alum.mit.edu> <CAPvvaa+A=LkYp9A+wENAABwCYaQcD0HVeX4o+O_16iJRPXZfNw@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B1C3744DC@ESESSMB209.ericsson.se> <CAPvvaaJsPNk1DAJXYoc8aUgZ0ZayV_8q84W=Mm7vwuRRGuwC-g@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B1C374572@ESESSMB209.ericsson.se> <519A3883.8060006@jitsi.org> <519A3C8F.3040309@alum.mit.edu> <519B343A.30704@jitsi.org> <519BB598.1030909@alum.mit.edu> <CAOJ7v-398_MiXLWjexU0Z0xQju3A-zWuQFkWkJSLPA5UEGAu+g@mail.gmail.com> <CABkgnnXqBzteoxH2qWBw1Xn9PHt2r___UCsp1Eoq4o8_VWvBZg@mail.gmail.com> <CAOJ7v-2xXb=uz3jBAKSXhyJ2mU9BGvYHZ=dkeKcZTWov7udWKQ@mail.gmail.com> <519CCE58.3000807@alum.mit.edu> <CAMvTgcdPZfBTyzoBZGCdJiHX+TaL3_T8+MnxH8+6vQPFTD4ZOA@mail.gmail.com> <CAOJ7v-1tmfy4Fu05ChcpbZT=bO-zr05qtOh9Lnw5bprbUEnoDw@mail.gmail.com>
Date: Thu, 23 May 2013 01:43:29 -0700
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From: Suhas Nandakumar <suhasietf@gmail.com>
To: Justin Uberti <juberti@google.com>
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Cc: mmusic <mmusic@ietf.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] Bundle offer with different ports - where to expect media?
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On Wed, May 22, 2013 at 3:55 PM, Justin Uberti <juberti@google.com> wrote: > I think we could do this using the existing syntax, e.g. > > an offer of a=group:BUNDLE A B C would indicate that the offerer would > prefer A, B, and C to be muxed onto A, and > an answer of a=group:BUNDLE C A would indicate that the answerer is going > to mux C and A onto C, and send B unbundled. > > > Agree with this. This also fits with the way to categorization for Attr Muxing as TRANSPORT. > > On Wed, May 22, 2013 at 7:11 AM, Kevin Dempsey <kevindempsey70@gmail.com>wrote: > >> Would it make it simpler if the offer included an attribute in bundled m= >> lines that said where to send the media if bundle is supported by the >> answerer; and for the answer to include an attribute that said where it was >> going to send the media (ie. to the bundled destination or the unbundled >> destination) >> >> >> On 22 May 2013 14:55, Paul Kyzivat <pkyzivat@alum.mit.edu> wrote: >> >>> On 5/22/13 1:00 AM, Justin Uberti wrote: >>> >>> Taking into account Emil's suggestion as well, this leads to this >>>> restatement of the rules: >>>> >>>> 1.1) An offerer must be prepared to receive unbundled traffic on the >>>> offered ports, as if talking to a legacy endpoint. >>>> 1.2) An offerer must be prepared to receive bundled traffic on any port, >>>> except the port associated with the last m= line. >>>> 2) Once the answer is received, the decision on bundled/unbundled and >>>> which ports to use is finalized. >>>> 2.1) BUNDLEd m= lines use the port of the m= line that appears first in >>>> the bundle. >>>> 2.2) Unused ports can be discarded at this point. >>>> 3.1) m= lines offered with distinct ports may be omitted from the bundle >>>> answer, in line with RFC 5888. >>>> 3.2) m= lines offered with the same port may not be omitted from the >>>> bundle answer, since there is no unbundled port from them to fall back >>>> to. >>>> 3.3) m= lines that are rejected are omitted from the bundle answer, per >>>> RFC 5888. >>>> >>>> Quick check on 2.1: are we using the m= line that appears first in the >>>> SDP, or the m= line that appears first in the a=group:BUNDLE? >>>> >>> >>> IMO it would be best to use the lexically first m-line that has a >>> non-zero port and that appears in the bundle group of the answer. >>> >>> Alternately, it *could* be the m-line with non-zero port that appears >>> first in the bundle group of the answer. But if so, the exception in 1.2 >>> would also need to be correspondingly adjusted. >>> >>> AFAICT the only reason to mention that exception in 1.2 is that might >>> provide an opportunity for optimization, by setting up the port with >>> simpler code that doesn't support bundling. I don't see a requirement in >>> 5888 that the bundle group in the answer be ordered the same way as in the >>> offer. So the one m-line guaranteed not to receive bundled traffic would >>> then not be predictable at the time of the offer, so could not be >>> exploited. This problem doesn't exist if the lexical ordering of m-lines is >>> used. >>> >>> Thanks, >>> Paul >>> >>> >>> ______________________________**_________________ >>> mmusic mailing list >>> mmusic@ietf.org >>> https://www.ietf.org/mailman/**listinfo/mmusic<https://www.ietf.org/mailman/listinfo/mmusic> >>> >> >> > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic > >
- [MMUSIC] Bundle offer with different ports - wher… Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Hutton, Andrew
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Hutton, Andrew
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Cullen Jennings (fluffy)
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Eric Rescorla
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Kevin Dempsey
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Dale R. Worley
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Suhas Nandakumar
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Cullen Jennings (fluffy)
- Re: [MMUSIC] Bundle offer with different ports - … Cullen Jennings (fluffy)
- [MMUSIC] When a bundle offer is forked Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Parthasarathi R
- Re: [MMUSIC] When a bundle offer is forked Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] When a bundle offer is forked Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Dale R. Worley
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] When a bundle offer is forked Christer Holmberg
- Re: [MMUSIC] When a bundle offer is forked Parthasarathi R
- Re: [MMUSIC] When a bundle offer is forked Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Parthasarathi R
- Re: [MMUSIC] When a bundle offer is forked Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] When a bundle offer is forked Cullen Jennings (fluffy)