Re: [Slim] Ticket #35 Have an attribute to abbreviate the bidirectionally-symmetric case

[Gunnar Hellström <[e-mail]>]

Den 2017-06-08 kl. 19:19, skrev Natasha Rooney:
> Related draft: 
> https://datatracker.ietf.org/doc/draft-ietf-slim-negotiating-human-language/ 
> <https://datatracker.ietf.org/doc/draft-ietf-slim-negotiating-human-language/?include_text=1>
>
> Hi all,
>
> Please review the below ticket and respond on-list to comments. We are 
> working through our final tickets before progressing the draft.
> https://trac.ietf.org/trac/slim/ticket/35

It is a good goal and a good proposal. But it causes complications and 
increased complexity, so sadly, I propose to reject it.

The complications are:
1. We would need to introduce a rule to not use hlang-send and 
hlang-recv in a media description where the symmetric hlang is used. 
That would cause undefined preference situations between languages.

2. If the offer contains the symmetric hlang, and the answering party 
has settings for different preferences in the different directions, the 
answering party needs to make a logical analysis and respond with the 
asymmetric attributes. The offering party then also needs to analyze 
this answer in asymmetric attributes and compare to what it originally 
sent in symmetric to find out how to start the call.  These operations 
add complexity in an undesirable way.  Maybe not super complex, but 
anyway added complexity.

/Gunnar


>
> Natasha
>
> Natasha Rooney | Internet Engineering Director | Internet and Web Team 
> | Technology | GSMA | [e-mail] <mailto:[e-mail]> | +44 
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Gunnar Hellström
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