[Slim] Question about "asymmetrical language use"

Bernard Aboba <bernard.aboba@gmail.com> Tue, 09 January 2018 23:07 UTC

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From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Tue, 9 Jan 2018 15:07:17 -0800
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To: slim@ietf.org, =?UTF-8?Q?Gunnar_Hellstr=C3=B6m?= <gunnar.hellstrom@omnitor.se>, Randall Gellens <rg+ietf@randy.pensive.org>
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Subject: [Slim] Question about "asymmetrical language use"
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In Section 5.1 of -22, I noted the following sentence:

" When placing an emergency call, and in any other case where the language
cannot be inferred from context, in an offer each media stream primarily
intended for human language communication SHOULD specify both (or for
asymmetrical language use, one of) the 'hlang- send' and 'hlang-recv'
attributes."

[BA] In our previous discussions, we have talked about scenarios (e.g.
speech impaired, but not hearing impaired) in which it is useful to include
both 'hlang-send' and 'hlang-recv' so as to accommodate user needs.
Wouldn't such a scenario qualify as "asymmetrical language use"?  If so,
how could the user's needs be accommodated with only one of the
'hlang-send' or 'hlang-recv' attributes?