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Re: [MMUSIC] Offer/Answer PT Questions - text proposal

Roman Shpount <roman@telurix.com> Mon, 07 March 2016 19:34 UTC

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References: <7594FB04B1934943A5C02806D1A2204B37E425AB@ESESSMB209.ericsson.se> <7594FB04B1934943A5C02806D1A2204B37E4BD38@ESESSMB209.ericsson.se> <56D463A3.8070007@alum.mit.edu> <7594FB04B1934943A5C02806D1A2204B37E4D5E9@ESESSMB209.ericsson.se> <56D4B1F1.2070706@alum.mit.edu> <7594FB04B1934943A5C02806D1A2204B37E4D951@ESESSMB209.ericsson.se> <66F2264B-3CA3-4650-88B6-89FC64D5FD29@csperkins.org> <7594FB04B1934943A5C02806D1A2204B37E4DB7C@ESESSMB209.ericsson.se> <56D4C0F5.50901@alum.mit.edu> <7594FB04B1934943A5C02806D1A2204B37E4EAD1@ESESSMB209.ericsson.se> <56D5CAA0.2060901@alum.mit.edu> <CAD5OKxtdmhW-opmp2TQou5wYbz70FdUvftr1PAZb9YiW4crevA@mail.gmail.com> <56D5E81F.2040306@alum.mit.edu> <CAD5OKxtXzhP9L-V6O5NVtCN4aQHy9X8Fpkc0_xKdWmtR03h4KQ@mail.gmail.com> <56D5EE38.2060706@alum.mit.edu> <7594FB04B1934943A5C02806D1A2204B37E5401A@ESESSMB209.ericsson.se> <56D70A1E.4020108@alum.mit.edu> <CAD5OKxtt2w=RB6FvsHwWeWBb1mSF7pO2+hBZM2VtgKAin846uw@mail.gmail.com> <56D7158B.4060104@alum.mit.edu> <CAD5OKxte9JQVMEwi9jf0ov7qGTzCzXXg5W3xSBzT0iKNMCJ3NQ@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B37E54908@ESESSMB209.ericsson.se> <CAD5OKxvUdeF8HRq1d_H63SRa33Zynx=f2p=vVb-44x1x6DnGOQ@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B37E556A0@ESESSMB209.ericsson.se> <CAD5OKxu2WWt1abKMRW+yzKu9napxB+0Ofy6zZv1rFe2c=2eDsQ@mail.gmail.com> <949EF20990823C4C85C18D59AA11AD8BADE98190@FR712WXCHMBA11.zeu.alcatel-lucent.com> <CAD5OKxt_hxfmXOYn5N3TOSJ4r5_hnLVJEtP=SwqKnxOcrRzSQQ@mail.gmail.com> <A8830380-5F2B-4554-B074-A878698CBF3F@csperkins.org> <949EF20990823C4C85C18D59AA11AD8BADE991AC@FR712WXCHMBA11.zeu.alcatel-lucent.com>
Date: Mon, 07 Mar 2016 14:34:21 -0500
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From: Roman Shpount <roman@telurix.com>
To: "Drage, Keith (Nokia - GB)" <keith.drage@nokia.com>
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Cc: Christer Holmberg <christer.holmberg@ericsson.com>, EXT Colin Perkins <csp@csperkins.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Offer/Answer PT Questions - text proposal
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On Sun, Mar 6, 2016 at 8:00 PM, Drage, Keith (Nokia - GB) <
keith.drage@nokia.com> wrote:

> This is my understanding as well.
>
>
>
> It would be good to know what the starting point for Roman’s RTP mixers is
> – what does he think they conform to?
>
>
>
> Keith
>
>
>
> *From:* EXT Colin Perkins [mailto:csp@csperkins.org]
> *Sent:* 06 March 2016 11:50
> *To:* Roman Shpount
> *Cc:* Drage, Keith (Nokia - GB); mmusic@ietf.org; Paul Kyzivat; Christer
> Holmberg
> *Subject:* Re: [MMUSIC] Offer/Answer PT Questions - text proposal
>
>
>
> On 4 Mar 2016, at 19:13, Roman Shpount <roman@telurix.com> wrote:
>
>
>
> On Fri, Mar 4, 2016 at 7:28 AM, Drage, Keith (Nokia - GB) <
> keith.drage@nokia.com> wrote:
>
> Note that RFC 7656 also gives the definition of RTP session.
>
>
>
> I think RFC 7656 ignores existence of RTP mixers which makes large number
> of its definitions, including RTP session, inaccurate.
>
>
>
> To me, the definition of an RTP session in Section 2.2.2 of RFC 7656 looks
> accurate even accounting for RTP Mixers (as RTP mixer is defined in RFC
> 3550).
>
>
>
> Many RTP topologies use middleboxes that are not RFC 3550 compliant, so
> don’t fit with this definition of an RTP Session, but that’s a problem with
> they way those middleboxes are defined. RFC 7667 tries to identify some of
> these issues.
>
I think I misread the RFC 7656 RTP Session definition as only containing
two SSRC at any give time. This was my mistake. RFC 7656 RTP Session
definition is correct.

Sorry for confusion and note to increase coffee intake on Fridays.
_____________
Roman Shpount

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