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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

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 08 April 2020 21:01 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Gunnar Hellström <gunnar.hellstrom@omnitor.se>, Benjamin Kaduk <kaduk@mit.edu>, The IESG <iesg@ietf.org>
CC: "fandreas@cisco.com" <fandreas@cisco.com>, "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>, "draft-ietf-mmusic-t140-usage-data-channel@ietf.org" <draft-ietf-mmusic-t140-usage-data-channel@ietf.org>
Thread-Topic: [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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Date: Wed, 08 Apr 2020 21:01:25 +0000
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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,



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.



    Regards,



    Christer

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