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Re: [MMUSIC] Benjamin Kaduk's No Objection on draft-ietf-mmusic-t140-usage-data-channel-12: (with COMMENT) - Christer's 2nd reply

Gunnar Hellström <gunnar.hellstrom@ghaccess.se> Wed, 08 April 2020 21:17 UTC

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To: Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org>, Benjamin Kaduk <kaduk@mit.edu>, The IESG <iesg@ietf.org>
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From: Gunnar Hellström <gunnar.hellstrom@ghaccess.se>
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Date: Wed, 08 Apr 2020 23:17:32 +0200
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Subject: Re: [MMUSIC] Benjamin Kaduk's No Objection on draft-ietf-mmusic-t140-usage-data-channel-12: (with COMMENT) - Christer's 2nd reply
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Hi,

Please note that I am moving to a new e-mail address.

Den 2020-04-08 kl. 23:01, skrev Christer Holmberg:
>
> Hi,
>
> I noted there were one more place where Gunnar asked for my input. I 
> am addressing that in this reply.
>
> (Gunnar, let me know if there is something I've missed.)
>
>     ----------------------------------------------------------------------
>
>     COMMENT:
>
> ----------------------------------------------------------------------
>
>  .....
>
>     Section 5.2
>
>     >>
>
>     >>     Each T140block is sent on the SCTP stream [RFC4960] used to 
> realize
>
>     >>     the T.140 data channel using standard T.140 transmission 
> procedures
>
> >> [T140].  [...]
>
>     >>
>
>     >> I'm not really sure what is meant by "standard T.140 transmission
>
>     >> procedures" -- is that supposed to cover the process by which 
> the webrtc
>
>     >> stack receives the T.140 input or something done within webrtc?
>
> >
>
>     > This is esseentially chapter 7 of T.140. It is at least to use 
> UTF-8
>
>     > coding as specified in T.140. And start after channel 
> establishment by
>
> > sending UTF-8 BOM. It is also to not buffer longer than 500 ms, even if
>
>     > that is also said in another place.
>
>     >>
>
>     >>     Data sending and reporting procedures conform to [T140].
>
>     >>
>
>     >> I don't see any instance of the string "report" in
>
>     >> file:///home/bkaduk/Downloads/T-REC-T.140-199802-I!!PDF-E.pdf; am I
>
>     >> missing something?
>
> >
>
> > Right. There is only one response specified in T.140. It is the
>
> > "Unsupported request" in section 8.7. But that cannot really be called a
>
> > report. Maybe another reference was intended here.
>
>     > draft-ietf-rtcweb-data-channel could be intended for the 
> sending, but it
>
>     > has nothing on reporting. W3C webrtc has requirements on 
> reporting for
>
>     > statistics, but I doubt that that was intended. Over to Christer...
>
> I don’t know where “reporting” is coming from. It was already in the 
> old schwarz draft (that this draft replaced).
>
> I also had a look in T.140, and couldn’t find anything related to 
> reporting.
>
> My suggestion is to remove it.
>
Fine with me.

/Gunnar

>  Regards,
>
> Christer
>
>
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-- 
Gunnar Hellström
GHAccess
gunnar.hellstrom@ghaccess.se

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