Re: [MMUSIC] BUNDLE Weekly Summary: Assumptions

Eric Rescorla <ekr@rtfm.com> Fri, 10 May 2013 22:27 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 10 May 2013 15:26:28 -0700
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To: Martin Thomson <martin.thomson@gmail.com>
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Cc: "Cullen Jennings \(fluffy\)" <fluffy@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] BUNDLE Weekly Summary: Assumptions
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On Fri, May 10, 2013 at 3:23 PM, Martin Thomson <martin.thomson@gmail.com>wrote;wrote:

> On 10 May 2013 15:17, Eric Rescorla <ekr@rtfm.com> wrote:
> > On Fri, May 10, 2013 at 3:16 PM, Martin Thomson <
> martin.thomson@gmail.com>
> > wrote:
> >>
> >> On 10 May 2013 15:05, Eric Rescorla <ekr@rtfm.com> wrote:
> >> > I'm sorry to be slow today, but can you point me to the specific MUST
> >> > NOT in
> >> > RFC 5888.
> >>
> >> I struggled to find it too.  It's in 9.2:
> >>
> >>    SIP entities refuse media streams by setting the port to zero in the
> >>    corresponding "m" line. "a=group" lines MUST NOT contain
> >>    identification-tags that correspond to "m" lines with the port set to
> >>    zero.
> >
> > This feels like something we could relax for the offer.
>
> Absolutely.  It seems a little arbitrary.  That said, I'd like to
> understand why the MUST NOT exists.  Of the groupings I understand, I
> can't think of a reason not to allow negotiated-off lines, but I'm
> prepared to be surprised.
>

Indeed.

Of course, if it is a problem we can invent:
a=group-without-5888-restrictions:....

-Ekr