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

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 23 April 2018 07:13 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Suhas Nandakumar <suhasietf@gmail.com>
CC: "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] ice-options attribute: session- and media-level?
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Date: Mon, 23 Apr 2018 07:12:54 +0000
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Subject: Re: [MMUSIC] ice-options attribute: session- and media-level?
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Hi Suhas,

>> Section 4.6 of draft-ietf-mmusic-ice-sip-sdp-20 defines the ‘ice-options’ attribute as both session- and media-level.
>>
>>However, there is no description of what it means to use the attribute on media-level. Does it mean that the indicated ICE extension is only used for that particular media stream?
>
> [Suhas] Section 10.2 defines explanation of each ice-options attributes for media-level and session level considerations.
> https://tools.ietf.org/html/draft-ietf-mmusic-ice-sip-sdp-20#section-10.2

That text is VERY confusing  - especially the stuff about “media-level attributes being MUST be aggregated on session-level”.

Also, the text seems to define such “aggregation rules" for the “rtp+ecn” option. If so, shouldn’t the draft update RFC 6679?

Related to that, the text says that the the “rtp+ecn” option can only be used on session-level if it applies to all media, otherwise it has to be on the media-level. How does that fulfil the “MUST aggregate to session-level” requirement?

Regards,

Christer





Also, section 5.12 of draft-ietf-mmusic-sdp-mux-attributes-16 indicates the attribute as session only (“S”).

Is there a need to define it as media-level attribute?

Regards,

Christer


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