Re: [MMUSIC] I-D Action: draft-ietf-mmusic-opportunistic-negotiation-01.txt

[Christer Holmberg <[e-mail]>]

Hi,

>I agree that ideally we should have all the associated procedures in
>one place and having two specs is not ideal however we have been going
>round this circle for a couple of years now and just need to get this
>done.
>
>Originally we wanted this work to be done in MMUSIC but it got
>dispatched to SIPBrandy but it was later discovered that an update to
>RFC 4568 was needed and that the SIPBrandy charter did not allow this
>so we were told an MMUSIC draft was needed after all to update the RFC
>before the SIPBrandy work could be completed.
>
>I do not want to start again and waste another couple of years lets
>just get it finished.

I suggest that we:

1)	Keep the SIPBRANDY draft as it is. Perhaps they could add a sentence
pointing out that that the normative procedures will be described
elsewhere.
2)	Keep the MMUSIC draft, but we add a proper 'SDP Offer/Answer
Considerations’ section, where we include the normal subsections (create
initial offer, process offer, process answer etc).

Regards,

Christer




>On Wed, Sep 27, 2017 at 9:35 PM, Christer Holmberg
><[e-mail]> wrote:
>> Hi,
>>
>>
>>
>> In the mail you referenced the following is said:
>>
>>
>>
>> “I see your point but Currently SIPBRANDY is chartered to produce
>> Opportunistic SRTP as a BCP. There is also a milestone to
>>
>> inform MMUSIC or other appropriate WGs of any changes needed to support
>> Opportunistic SRTP (Not expected to be published
>>
>> as an RFC).  I think SIPBRANDY is just carrying out what they are
>>chartered
>> to do.”
>>
>>
>>
>> But, draft-ietf-mmusic-opportunistic-negotiation doesn’t really define
>>any
>> procedures ­ it references the SIPBRANDY draft for everything.
>>
>>
>>
>> “[I-D.ietf-sipbrandy-osrtp] describes how Secure Real-time transport
>>
>>               protocol (SRTP) can be negotiated opportunistically.”
>>
>>
>>
>> But, as the SIPBRANDY is only Informational, where are the normative
>> procedures?
>>
>>
>>
>> “The exact negotiation mechanism is however outside the scope of this
>> document,
>>
>>               an example mechanism can be found in
>> [I-D.ietf-sipbrandy-osrtp].”
>>
>>
>>
>> How can negotiation be outside the scope of the document, when the
>>title of
>> the document contains “negotiating”?
>>
>>
>>
>> In addition, the text says that the sipbrandy only contains “an example
>> mechanism”.
>>
>>
>>
>> If we are going to have this document, I think we shall include
>>normative
>> offer/answer procedures. The draft DOES contain some normative
>>procedures,
>> but I think we shall have it all in one place. One shall not have to
>>read
>> both documents just to figure out the offer/answer procedures.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> From: Gonzalo Salgueiro (gsalguei) [mailto:[e-mail]]
>> Sent: 27 September 2017 21:58
>> To: Christer Holmberg <[e-mail]>
>> Cc: [e-mail]
>> Subject: Re: [MMUSIC] I-D Action:
>> draft-ietf-mmusic-opportunistic-negotiation-01.txt
>>
>>
>>
>> Hi Christer -
>>
>>
>>
>> See this:
>> https://mailarchive.ietf.org/arch/msg/mmusic/wov2yErrgtUZURyRyVuVZ6K-nLI
>>
>>
>>
>> Cheers,
>>
>>
>>
>> -G
>>
>>
>>
>> On Sep 27, 2017, at 9:19 AM, Christer Holmberg
>> <[e-mail]> wrote:
>>
>>
>>
>> Hi,
>>
>> I am currently reviewing draft-ietf-sipbrandy-osrtp-03, and the
>>following
>> question comes to my mind: do we really need
>> draft-ietf-mmusic-opportunistic-negotiation? :)
>>
>> Section 3 of draft-ietf-sipbrandy-osrtp-03 already more or less contains
>> SDP Offer/Answer procedures for OSRTP. We can change the name of
>>section 3
>> in that draft to ³SDP Offer/Answer Procedures², modify the structure a
>> little, and add whatever might be missing.
>>
>> Or, am I missing something?
>>
>> Regards,
>>
>> Christer
>>
>>
>>
>>
>>
>> On 14/09/17 19:03, "mmusic on behalf of [e-mail]"
>> <[e-mail] on behalf of [e-mail]> wrote:
>>
>>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>> This draft is a work item of the Multiparty Multimedia Session Control
>>WG
>> of the IETF.
>>
>>       Title           : Negotiating SRTP and RTCP Feedback using the
>> RTP/AVP Profile
>>       Authors         : Andrew Hutton
>>                         Roland Jesske
>>                         Alan Johnston
>>                         Gonzalo Salgueiro
>>                         Bernard Aboba
>> Filename        : draft-ietf-mmusic-opportunistic-negotiation-01.txt
>> Pages           : 7
>> Date            : 2017-09-14
>>
>> Abstract:
>>  This document describes how the use of the Secure Real-time transport
>>  protocol (SRTP) [RFC3711]. can be negotiated using the RTP/AVP (Audio
>>  Video Profile) defined in [RFC3551].  Such a mechanism is used to
>>  provide a means for encrypted media to be used in environments where
>>  support for encryption is not known in advance, and not required.
>>  The same mechanism is also applied to negotiation of the Extended RTP
>>  Profile for Real-time Transport Control Protocol Based Feedback (RTP/
>>  AVPF) [RFC4585].
>>
>>
>> The IETF datatracker status page for this draft is:
>> 
>>https://datatracker.ietf.org/doc/draft-ietf-mmusic-opportunistic-negotiat
>>i
>> on/
>>
>> There are also htmlized versions available at:
>> 
>>https://tools.ietf.org/html/draft-ietf-mmusic-opportunistic-negotiation-0
>>1
>> 
>>https://datatracker.ietf.org/doc/html/draft-ietf-mmusic-opportunistic-neg
>>o
>> tiation-01
>>
>> A diff from the previous version is available at:
>> 
>>https://www.ietf.org/rfcdiff?url2=draft-ietf-mmusic-opportunistic-negotia
>>t
>> ion-01
>>
>>
>> Please note that it may take a couple of minutes from the time of
>> submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>>
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