Re: [MMUSIC] BUNDLE: Splitting a BUNDLE

Justin Uberti <juberti@google.com> Tue, 21 May 2013 22:41 UTC

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From: Justin Uberti <juberti@google.com>
Date: Tue, 21 May 2013 15:41:14 -0700
Message-ID: <CAOJ7v-0OfJehPUtH33+r5O6Vjok9x7VrAB-a5tpPnzxNKMA3HA@mail.gmail.com>
To: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] BUNDLE: Splitting a BUNDLE
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Agree completely. Otherwise media may show up at an unexpected port for the
offerer.


On Tue, May 21, 2013 at 7:52 AM, Cullen Jennings (fluffy)
<fluffy@cisco.com>wrote;wrote:

>
> On May 14, 2013, at 6:01 AM, Christer Holmberg <
> christer.holmberg@ericsson.com> wrote:
>
> > Hi,
> >
> >>>> We seem to have an agreement that, when an SDP offer contains an m-
> >>>> line associated with a bundle group, it is ok to leave that m- line
> >>>> outside the bundle group in the SDP Answer.
> >>>>
> >>> Now, there has been some discussions about b>
> >>> Yes, this is the conclusion I reached. I wish it weren't true. But I
> >>> think there must be a mechanism for the new bundle to be rejected, and
> >>> if it is first proposed in the answer then that isn't possible.
> >>>
> >>> IMO this is a rare enough case that suffering another O/A is
> acceptable.
> >>
> >> I agree with Paul here.
> >
> > Me too :)
> >
> >> Allowing a new group (bundle) to be created in an answer is a much
> larger deviation from RFC 5888 than allowing an m= line with a zero port to
> be in a group, and the accept/reject problem can't be solved.
> >
> > Note that there are two cases:
> >
> > 1) A new bundle is created in the answer
> >
> > 2) An m- line is moved from bundle_x in the offer to bundle_y in the
> answer. bundle_y was also present in the offer, so it is not created by the
> answerer.
> >
> > In my opinion 2) should not be allowed either, as the m- line was not
> present in bundle_y in the offer.
> >
>
> Agree with you and to say more …
>
> I think that both 1 and 2 should *not* be allowed. There is no use case to
> drive needing them and it is complicated. That can be done with a new offer
> if needed.
>
>
> > Regards,
> >
> > Christer
> >
> >
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