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

[Christer Holmberg <[e-mail]>]

Hi,

In the middle of my BUNDLE euphoria, it seems like I mixed up some things.

RFC 5245 defines ice-options as session-level only, and that is what we
also agreed for ice-sip-sdp, so all good :)

Regards,

Christer



On 20/06/18 10:21, "mmusic on behalf of Christer Holmberg"
<[e-mail] on behalf of [e-mail]>
wrote:

>Hi,
>
>>>>> The draft defines the ice-options SDP attribute, so the draft needs
>>>>> to define what type (media and/or session) of SDP attribute it is.
>>>>
>>>> At the syntax level, yes. Sematically, however, is it perhaps the job
>>>> of the ICE specification to define whether ICE extensions (however
>>>> encoded in a using protocol) are session-level or media-level?
>>> 
>>> whether session level, media level, or both is required as part of the
>>> registration of the attribute. It is considered part of the syntax
>>> even though it isn't part of the ABNF.
>>> 
>>> Of course the semantics of its use is also tied up in whether it is
>>> session or media level, and so needs to be described as part of the
>>> semantics as well.
>>
>> Hi Paul,
>>
>> I guess my concern is this: now that we've decoupled ICE from SDP, we
>>might lose synchronization between SDP bindings
>> and non-SDP bindings, which wouldn't be good for interoperability. As I
>>understand it, the ice-options attribute can include
>> a variety of tokens (e.g., 'ice2' or 'rtp+ecn'). Should it be the
>>responsibility of a token spec to specify whether a token is session
>> level or media level, or is that best handled at the attribute layer? I
>>am not an SDP expert so I might be missing something fundamental...
>
>Assuming that ICE options can be both media and session, I think each
>individual token spec needs to define which it is applicable to. However,
>RFC 6336 does not currently require to explicitly indicate whether an
>option is media and/or session - eventhough a description of the token is
>required.
>
>But, never the less, the ice-sip-sdp draft still needs to define whether
>the ice-options SDP attribute is media, session or both :)
>
>Regards,
>
>Christer
>
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