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Re: [MMUSIC] ice-options attribute: session- and media-level?

Roman Shpount <roman@telurix.com> Mon, 23 April 2018 17:03 UTC

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From: Roman Shpount <roman@telurix.com>
Date: Mon, 23 Apr 2018 13:03:46 -0400
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To: Marc Petit-Huguenin <marc@petit-huguenin.org>
Cc: Suhas Nandakumar <suhasietf@gmail.com>, Peter Saint-Andre <stpeter@mozilla.com>, mmusic WG <mmusic@ietf.org>
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Subject: Re: [MMUSIC] ice-options attribute: session- and media-level?
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Hi All,

I would prefer disaggregated media to be handled separately and keep
ice-options a session level attribute. Dealing with disaggregated media is
a much bigger issue then just adjusting ice-options. For instance, why
ice-options are handled there and ice-lite is excluded? I think ice-lite is
potentially as big of the problem when aggregating media from several
sources. Also, I we sure that making singe ICE agent dealing with two
independent ICE agents does not have any issues? I do not think this was
examined in sufficient detail.

Furthermore, it is possible to define per ICE candidate specific parameters
using ICE candidate extension attributes. I think it would be cleaner to
define things which are specific to only some candidates using this
mechanism vs medial level ice-options.

Regards,

_____________
Roman Shpount

On Mon, Apr 23, 2018 at 12:45 PM, Marc Petit-Huguenin <
marc@petit-huguenin.org> wrote:

> This was done as a consequence of merging this draft in ice-bis:
>
> https://www.ietf.org/archive/id/draft-petithuguenin-mmusic-
> ice-attributes-level-04.txt
>
> There is probably discussions that can be found in the minutes of IETF
> meetings around that time when the WG agreed to that modification.
>
> On 04/20/2018 11:09 PM, Suhas Nandakumar wrote:
> > I am fine with considering ice-options has session level too. I wonder if
> > Marc can chime in on considering it as  media level in the ice-sip-sdp.
> >
> > On Fri, Apr 20, 2018 at 12:07 PM, Peter Saint-Andre <stpeter@mozilla.com
> >
> > wrote:
> >
> >> On 4/20/18 12:37 PM, Roman Shpount wrote:
> >>> Hi All,
> >>>
> >>> I do not think ice-options was ever used as a media level attribute.
> >>> Only two ice-options defined in IANA registry
> >>> (https://www.iana.org/assignments/ice/ice.xhtml) are ice2 and
> rtp+ecn,
> >>> which are both session level.
> >>>
> >>> Furthermore, RFC 5245 section 15.5
> >>> (https://tools.ietf.org/html/rfc5245#section-15.5,) defined that
> >>> ice-options attribute is session level only. Thus, ice-options should
> be
> >>> kept session level for backwards compatibility.
> >>>
> >>> If something more granular then session is needed, I think it should go
> >>> into candidate extension attribute, not into media level ice-options.
> >>>
> >>> Bottom line, I think ice-options should be a a session level only
> >> attribute.
> >>
> >> Agreed.
> >>
> >> In the Trickle ICE spec, we also limited the `trickle` option to session
> >> level only.
> >>
> >> Peter
> >>
> >>
>
>
> --
> Marc Petit-Huguenin
> Email: marc@petit-huguenin.org
> Blog: https://marc.petit-huguenin.org
> Profile: https://www.linkedin.com/in/petithug
>
>
> _______________________________________________
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> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic
>
>

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