Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations) in draft-ietf-mmusic-rfc8843bis-06

"Murray S. Kucherawy" <superuser@gmail.com> Sat, 04 December 2021 20:58 UTC

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References: <443b55f8-9d42-6728-de87-36a8392aaa10@cisco.com> <CAOLzse3aNuKCp9jSXyzAdLjpaCZUzL4K071k3zLTWoE3Fry-BA@mail.gmail.com> <HE1PR07MB4441163C03DA3FA9A88B0114939F9@HE1PR07MB4441.eurprd07.prod.outlook.com> <CAOLzse1JMd=re=96OQR1qD6wj_SJnwRdUGAzU69k4v=gr4LcvQ@mail.gmail.com> <HE1PR07MB44419673CDC9E5C1CD76F04593609@HE1PR07MB4441.eurprd07.prod.outlook.com> <CAOLzse3e0bmNwkz_2T6QvpQYs5Q3dqB8YnEoVQp=YRPhGP+6Vw@mail.gmail.com> <CAD5OKxs25qiRvvFZDzda2CWun3MAwZxz8WrGYJdDHEgdB1d0ng@mail.gmail.com> <HE1PR07MB44415ADB77F0EA6B8732DB2393619@HE1PR07MB4441.eurprd07.prod.outlook.com> <CAOLzse3yFO+iAWEeqrv_WZTZZi0xO3C3pGL+G13-59N4+kgj-A@mail.gmail.com> <HE1PR07MB44418958A9C748993B42342293649@HE1PR07MB4441.eurprd07.prod.outlook.com> <CAD5OKxuwy6dJdZfvmHtTSwdffz0efiWRkf6fVGLoDJD2kgayfw@mail.gmail.com> <CAOLzse26gsHrTfffeFanKPh+zBUvo4bB29MeuKsVWrq2gyq-2w@mail.gmail.com> <HE1PR07MB44419D003F32B7992D8208BB93669@HE1PR07MB4441.eurprd07.prod.outlook.com> <da187426-670e-8a00-cfb5-d562213dcf7d@cisco.com> <HE1PR07MB444195E3707CCABC34326B2E93699@HE1PR07MB4441.eurprd07.prod.outlook.com> <CAD5OKxtnAg+XwRmHyTczQGByhu6oeAjBmgV_BD5vgbedD1pJpw@mail.gmail.com> <VI1PR07MB4447D45204EFAEF7F7928E37936A9@VI1PR07MB4447.eurprd07.prod.outlook.com> <HE1PR07MB4441B9EB1CC4682AF0E65B7D936A9@HE1PR07MB4441.eurprd07.prod.outlook.com> <CAD5OKxuz+yGSakmsUv9UjFUnruROG2ZCOqTQ3ix0b8i4snZs8Q@mail.gmail.com>
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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Sat, 04 Dec 2021 12:57:41 -0800
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To: Roman Shpount <roman@telurix.com>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, Flemming Andreasen <fandreas@cisco.com>, "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>, Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org>, mmusic <mmusic@ietf.org>
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Subject: Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations) in draft-ietf-mmusic-rfc8843bis-06
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Thanks for the extra effort to clear this up.

I've reviewed the change between -04 (which the IESG approved) and -08 (the
current version) and find the changes are largely informative only, so I
don't think a second IETF-wide Last Call is necessary.  I'm going to
indicate such to the IESG and give them a few days to object; absent any
such objections, I'll release it from its IESG hold in the RFC Editor queue.

-MSK


On Fri, Dec 3, 2021 at 3:08 PM Roman Shpount <roman@telurix.com> wrote:

> Thank you!
> _____________
> Roman Shpount
>
>
> On Fri, Dec 3, 2021 at 4:32 PM Christer Holmberg <
> christer.holmberg@ericsson.com> wrote:
>
>> Hi,
>>
>>
>>
>> Based on Roman’s comments, I have submitted a new version (-08) of
>> 8843bis.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>>
>>
>>
>> *From:* mmusic <mmusic-bounces@ietf.org> *On Behalf Of *Christer Holmberg
>> *Sent:* perjantai 3. joulukuuta 2021 11.19
>> *To:* Roman Shpount <roman@telurix.com>
>> *Cc:* Flemming Andreasen <fandreas@cisco.com>; mmusic-chairs@ietf.org;
>> mmusic <mmusic@ietf.org>
>> *Subject:* Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations)
>> in draft-ietf-mmusic-rfc8843bis-06
>>
>>
>>
>> Hi Roman,
>>
>>
>>
>> Regarding the nits in 7.4.1 and the missing comma in 7.6, I will fix as
>> suggested.
>>
>>
>>
>> Regarding the “rewriting” wording, I think it should be either “e.g., by
>> rewriting” or “and e.g., rewrite”. Simply “e.g., rewrite” does not sound
>> right to me.
>>
>>
>>
>> But, someone who is more fluent in English than I am can of course
>> correct me :)
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>>
>>
>>
>> *From:* Roman Shpount <roman@telurix.com>
>> *Sent:* perjantai 3. joulukuuta 2021 1.21
>> *To:* Christer Holmberg <christer.holmberg@ericsson.com>
>> *Cc:* Flemming Andreasen <fandreas@cisco.com>; mmusic-chairs@ietf.org;
>> mmusic <mmusic@ietf.org>
>> *Subject:* Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations)
>> in draft-ietf-mmusic-rfc8843bis-06
>>
>>
>>
>> Hi Christer,
>>
>>
>>
>> I have reviewed the changes and there are a couple of nits:
>>
>>
>>
>> In 7.4.1:
>>
>> "answeris" should be  "answer is"
>>
>>
>>
>> In 7.6
>>
>> "In this situation the endpoint" should be "In this situation, the
>> endpoint" (missing comma).
>>
>>
>>
>> "Therefore, the 3PCC controller SHOULD take actions to mitigate this
>> problem, e.g., by rewriting the subsequent BUNDLE offer into a valid
>> initial BUNDLE offer (Section 7.2), before it forwards the BUNDLE offer to
>> a UA."
>>
>>
>>
>> should be
>>
>>
>>
>> "Therefore, the 3PCC controller SHOULD take actions to mitigate this
>> problem, e.g., rewrite the subsequent BUNDLE offer into a valid initial
>> BUNDLE offer (Section 7.2), before it forwards the BUNDLE offer to a UA."
>>
>>
>>
>> Best Regards,
>>
>> _____________
>> Roman Shpount
>>
>>
>>
>>
>>
>> On Thu, Dec 2, 2021 at 3:54 AM Christer Holmberg <christer.holmberg=
>> 40ericsson.com@dmarc.ietf.org> wrote:
>>
>> Hi,
>>
>>
>>
>> I just submitted a new version (-07), which implements the changes based
>> on Paul’s comments.
>>
>>
>>
>> Thank You to everyone who provided comments and input! :)
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>>
>>
>>
>> *From:* Flemming Andreasen <fandreas@cisco.com>
>> *Sent:* maanantai 29. marraskuuta 2021 20.13
>> *To:* Christer Holmberg <christer.holmberg@ericsson.com>;
>> mmusic-chairs@ietf.org
>> *Cc:* mmusic <mmusic@ietf.org>
>> *Subject:* Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations)
>> in draft-ietf-mmusic-rfc8843bis-06
>>
>>
>>
>>
>>
>> On 11/29/21 11:58, Christer Holmberg wrote:
>>
>> Chairs,
>>
>>
>>
>> Can I submit a new version of the document, with the changes suggested
>> below?
>>
>>
>> Please do. Also, did Paul Kyzivat's comments get resolved / updated ?
>>
>> Thanks
>>
>> -- Flemming
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>> ------------------------------
>>
>> *From:* Justin Uberti <juberti@alphaexplorationco.com>
>> <juberti@alphaexplorationco.com>
>> *Sent:* Monday, November 29, 2021 1:46 AM
>> *To:* Roman Shpount <roman@telurix.com> <roman@telurix.com>
>> *Cc:* Christer Holmberg <christer.holmberg@ericsson.com>
>> <christer.holmberg@ericsson.com>; Flemming Andreasen <fandreas@cisco.com>
>> <fandreas@cisco.com>; mmusic <mmusic@ietf.org> <mmusic@ietf.org>
>> *Subject:* Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations)
>> in draft-ietf-mmusic-rfc8843bis-06
>>
>>
>>
>> Looks good to me too.
>>
>>
>>
>> On Sun, Nov 28, 2021 at 2:13 AM Roman Shpount <roman@telurix.com> wrote:
>>
>> This still works for me.
>>
>> _____________
>> Roman Shpount
>>
>>
>>
>>
>>
>> On Sat, Nov 27, 2021 at 4:33 PM Christer Holmberg <christer.holmberg=
>> 40ericsson.com@dmarc.ietf.org> wrote:
>>
>> Hi,
>>
>>
>>
>> Is everyone else ok with the changes?
>>
>>
>>
>> Change #1:
>>
>>
>>
>> Change ‘Offer’ and ‘Answer’ to ‘offer’ and ‘answer’ throughout the
>> document.
>>
>>
>>
>>
>>
>> Change #2:
>>
>>
>>
>> OLD:
>>
>>
>>
>>    In some 3rd Party Call Control (3PCC) scenarios a new session will be
>>
>>    established between an endpoint that is currently part of an ongoing
>>
>>    session and an endpoint that is currently not part of an ongoing
>>
>>    session.  The endpoint that is part of a session will generate a
>>
>>    subsequent SDP Offer that will be forwarded to the other endpoint by
>>
>>    a 3PCC controller.  The endpoint that is not part of a session will
>>
>>    process the Offer as an initial SDP Offer.
>>
>>
>>
>>    The Session Initiation Protocol (SIP) [RFC3261 <https://datatracker.ietf.org/doc/html/rfc3261>] allows a User Agent
>>
>>    Client (UAC) to send a re-INVITE request without an SDP body
>>
>>    (sometimes referred to as an empty re-INVITE).  In such cases, the
>>
>>    User Agent Server (UAS) will include an SDP Offer in the associated
>>
>>    200 (OK) response.  If the UAS is a part of an ongoing SIP session,
>>
>>    it will include a subsequent offer in the 200 (OK) response.  The
>>
>>    offer will be received by a 3PCC controller (UAC) and then forwarded
>>
>>    to another User Agent (UA).  If the UA is not part of an ongoing SIP
>>
>>    session, it will process the offer as an initial SDP Offer.
>>
>>
>>
>> NEW:
>>
>>
>>
>>    In some 3rd Party Call Control (3PCC) scenarios a new session will be
>>
>>    established between an endpoint that is currently part of an ongoing
>>
>>    session and an endpoint that is not currently part of an ongoing
>>
>>    session. In this situation the endpoint that is not part of a session,
>>
>>    while expecting an initial offer, can receive an SDP offer created as
>>
>>    a subsequent offer. The text below describes how this can occur with
>>
>>    the Session Initiation Protocol (SIP)[RFC3261 <https://datatracker.ietf.org/doc/html/rfc3261>].
>>
>>
>>
>>    SIP allows a User Agent Client (UAC) to send a re-INVITE request without
>>
>>    an SDP body (sometimes referred to as an empty re-INVITE). In such cases,
>>
>>    the User Agent Server (UAS) will include an SDP offer in the associated
>>
>>    200 (OK) response, and when the UAS is a part of an ongoing SIP session,
>>
>>    this offer will be a subsequent offer. This offer will be received
>>
>>    by the 3PCC controller (UAC) and then forwarded to another User Agent (UA).
>>
>>    When that UA is not part of an ongoing SIP session, as noted above,
>>
>>    it will process the offer as an initial SDP Offer.
>>
>>
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>>
>>
>>
>>
>>
>> *From:* mmusic <mmusic-bounces@ietf.org> *On Behalf Of *Justin Uberti
>> *Sent:* torstai 25. marraskuuta 2021 1.16
>> *To:* Christer Holmberg <christer.holmberg@ericsson.com>
>> *Cc:* Flemming Andreasen <fandreas=40cisco.com@dmarc.ietf.org>; mmusic <
>> mmusic@ietf.org>
>> *Subject:* Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations)
>> in draft-ietf-mmusic-rfc8843bis-06
>>
>>
>>
>> Good suggestion, that works for me.
>>
>>
>>
>> On Wed, Nov 24, 2021 at 3:17 AM Christer Holmberg <
>> christer.holmberg@ericsson.com> wrote:
>>
>> Hi,
>>
>>
>>
>> Maybe we instead of saying “as described below” could say ”The text below
>> describes how this can occur with SIP”.
>>
>>
>>
>> That way the 1st paragraph remains independent from SIP.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>>
>>
>>
>> *From:* Roman Shpount <roman@telurix.com>
>> *Sent:* tiistai 23. marraskuuta 2021 20.54
>> *To:* Justin Uberti <juberti@alphaexplorationco.com>
>> *Cc:* Christer Holmberg <christer.holmberg@ericsson.com>; Flemming
>> Andreasen <fandreas=40cisco.com@dmarc.ietf.org>; mmusic <mmusic@ietf.org>
>> *Subject:* Re: [MMUSIC] 1-week WGLC on Section 7.6 (3PCC Considerations)
>> in draft-ietf-mmusic-rfc8843bis-06
>>
>>
>>
>> Justin,
>>
>>
>>
>> Part of the reason for the non-SIP language and renaming the section was
>> to make it clearer that it can apply to WebRTC, not just SIP. I think the
>> goal here is to come up with the language that can be referenced from the
>> JSEP draft, which should reduce your work.
>>
>> _____________
>> Roman Shpount
>>
>>
>>
>>
>>
>> On Tue, Nov 23, 2021 at 1:29 PM Justin Uberti <
>> juberti@alphaexplorationco.com> wrote:
>>
>>
>>
>>
>>
>> On Tue, Nov 23, 2021 at 2:00 AM Christer Holmberg <
>> christer.holmberg@ericsson.com> wrote:
>>
>> Hi,
>>
>> >>>1) for some reason, "offer" has been replaced with "Offer" throughout
>> the document. This is a minor nit, but seems incorrect to me.
>> >>
>> >> I did that, because in the previous version we already used "BUNDLE
>> Offer", so I thought I'd do it to be consistent.
>> >
>> > The problem though is that "answer" still is in lowercase so that
>> introduces its own inconsistency.
>>
>> Good catch. I was actually going to change that too, but now realized I
>> forgot to.
>>
>> I have no strong opinion regarding whether we use upper- or lowercase, as
>> long as we are consistent.
>>
>> > Generally I think we should avoid capitalization of common words to
>> avoid confusion.
>>
>> I can change everything to lowercase.
>>
>>
>>
>> Sounds good.
>>
>>
>> ---
>>
>> >>>2) The first two paragraphs of 7.6 say similar things and it's not
>> clear to me why they both exist. Here is my suggested revision:
>> >>
>> >> The first paragraph is more general, while the second paragraph
>> describes how it is realized in SIP.
>> >
>> > Understood, but I feel like that intent was not totally clear in the
>> current text.
>>
>> I am mostly fine with your suggested modification.
>>
>> However, as we don't really talk about "offer semantics" elsewhere in the
>> document, perhaps:
>>
>> "In this situation the endpoint that is not part of a session can receive
>> an SDP offer, created as a
>> subsequent offer, while expecting an initial offer, as described below."
>>
>>
>>
>> That works. It might be easier to understand with the "while expecting an
>> initial offer" clause first:
>>
>>
>>
>> "In this situation the endpoint that is not part of a session, while
>> expecting an initial offer, can receive an SDP offer created as a
>>
>> subsequent offer, as described below."
>>
>>
>>
>> But I am fine either way.
>>
>>
>>
>> Regards,
>>
>> Christer
>>
>>
>>
>>
>>
>> OLD:
>>
>>    In some 3rd Party Call Control (3PCC) scenarios a new session will be
>>    established between an endpoint that is currently part of an ongoing
>>    session and an endpoint that is currently not part of an ongoing
>>    session.  The endpoint that is part of a session will generate a
>>    subsequent SDP Offer that will be forwarded to the other endpoint by
>>    a 3PCC controller.  The endpoint that is not part of a session will
>>    process the Offer as an initial SDP Offer.
>>
>>    The Session Initiation Protocol (SIP) [
>> https://datatracker.ietf.org/doc/html/rfc3261] allows a User Agent
>>    Client (UAC) to send a re-INVITE request without an SDP body
>>    (sometimes referred to as an empty re-INVITE).  In such cases, the
>>    User Agent Server (UAS) will include an SDP Offer in the associated
>>    200 (OK) response.  If the UAS is a part of an ongoing SIP session,
>>    it will include a subsequent offer in the 200 (OK) response.  The
>>    offer will be received by a 3PCC controller (UAC) and then forwarded
>>    to another User Agent (UA).  If the UA is not part of an ongoing SIP
>>    session, it will process the offer as an initial SDP Offer.
>>
>> NEW:
>>
>>    In some 3rd Party Call Control (3PCC) scenarios a new session will be
>>    established between an endpoint that is currently part of an ongoing
>>    session and an endpoint that is not currently part of an ongoing
>>    session.  In this situation the endpoint that is not part of a session
>>    can receive SDP with subsequent offer semantics in an initial
>>    SDP Offer, as described below.
>>
>>    The Session Initiation Protocol (SIP) [
>> https://datatracker.ietf.org/doc/html/rfc3261] allows a User Agent
>>    Client (UAC) to send a re-INVITE request without an SDP body
>>    (sometimes referred to as an empty re-INVITE).  In such cases, the
>>    User Agent Server (UAS) will include an SDP offer in the associated
>>    200 (OK) response, and when the UAS is a part of an ongoing SIP
>> session,
>>    this offer will be a subsequent offer. This offer will be received
>>    by the 3PCC controller (UAC) and then forwarded to another User Agent
>> (UA).
>>    When that UA is not part of an ongoing SIP session, as noted above,
>>    it will process the offer as an initial SDP Offer.
>>
>> On Wed, Nov 17, 2021 at 3:16 PM Flemming Andreasen <fandreas=mailto:
>> 40cisco.com@dmarc.ietf.org> wrote:
>> Greetings MMUSIC
>>
>> We previously submitted draft-ietf-mmusic-rfc8843bis for publication,
>> however subsequently, the issue of 3rd Party Call Control came up and as a
>> result of that, Section 7.6 has been updated accordingly.
>>
>> We are hereby starting a 1-week WGLC on Section 7.6 only in
>> draft-ietf-mmusic-rfc8843bis-06.
>>
>> If you have any comments on Section 7.6, please send those to the
>> document authors and the MMUSIC mailing list by Wednesday November 24,
>> 2021. If you review it but do not have any comments, please send a note to
>> that effect as well.
>>
>> Thanks
>>
>> -- Flemming (MMUSIC co-chair)
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