Re: [Slim] Modality preference

Brian Rosen <> Mon, 19 June 2017 13:31 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 7C029129534 for <>; Mon, 19 Jun 2017 06:31:54 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.889
X-Spam-Status: No, score=-1.889 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_SPF_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: (amavisd-new); dkim=pass (2048-bit key)
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id ZFox-pPhtt8b for <>; Mon, 19 Jun 2017 06:31:52 -0700 (PDT)
Received: from ( [IPv6:2607:f8b0:400e:c00::243]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by (Postfix) with ESMTPS id 23F1E131453 for <>; Mon, 19 Jun 2017 06:31:52 -0700 (PDT)
Received: by with SMTP id w12so16975792pfk.0 for <>; Mon, 19 Jun 2017 06:31:52 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20150623; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=/U8o23s3oSu64Ebb32AffDfCZe8kFtD/dKdp52fGTOs=; b=rfsSNA0gIr4RELoV0WEbdWfp9SXmpHQr5h90tebHZDQK1DkvlmBAAYfaX1UfK4Ouq9 QZ2wZnQdBoi8AVDw1MHC3UwzVswEOugStVyw4hqHEWR2lQWwu0S0QLR/y0qoeNThss6t 4HKAGxmACGS6YByHYpkDVRIX7/9dXDXnpXF+lZ36HhGTRwJ2XltOzUHSo7a1GLTkndY3 ePHCr+ydzaelaX6ZBDRXSgnj/w7aqyEL9zoi3tWRCNPY16dEU0v1baQ1GNtZ5QICXsUZ Ys/PybcjoVov2FDBWeU6C3Gr6eLqMf/vsoN5lPnfRhqwQTK3eVbajH86bQDo5TKNqmkK Z3mA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=/U8o23s3oSu64Ebb32AffDfCZe8kFtD/dKdp52fGTOs=; b=PhHVVFrkDqCC+rB4ljeJy1TQ11KY3PVqFm4qr/oqSrXeNCqkP9h2BHid9DyCMr1wW6 hm4oj+LmdEOBcaLSTpHuq3NFUvbY8sq6YH5bQxXEB3W5tYT6gUd2lqWfSQtjWmHwzKSz 8G4KugVAt75NUmdztJsffQuWSdrQtijNPZNdyHTnc0Vj9VTsnG2SKnT96lJ9wFVysghZ 3mk610mC3lUR2Ria0dnmdyV9C2ZsAp85q9P5K+vjCZpHeUmZAaUz1HLMlPRcfNfeTFoZ DEtZvsAm91dG5FZxj9cqCm2imAN2DmBLD0ULG48712md0sHnlIDMJpXhCm0pd6oqGhbt mIZw==
X-Gm-Message-State: AKS2vOyNS9DUv7+Coanum4hzH4tUHnwFykrNhC25t1zIubVmg81Lh+dx ue57SUxtIG8Kx95sNIIwCA==
X-Received: by with SMTP id 3mr29910105pls.220.1497879111774; Mon, 19 Jun 2017 06:31:51 -0700 (PDT)
Received: from [] ( []) by with ESMTPSA id n9sm7068532pgf.50.2017. (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 19 Jun 2017 06:31:51 -0700 (PDT)
Content-Type: text/plain; charset="utf-8"
Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\))
From: Brian Rosen <>
In-Reply-To: <>
Date: Mon, 19 Jun 2017 09:31:48 -0400
Content-Transfer-Encoding: quoted-printable
Message-Id: <>
References: <>
To: Filip Asplund <>
X-Mailer: Apple Mail (2.3273)
Archived-At: <>
Subject: Re: [Slim] Modality preference
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Selection of Language for Internet Media <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Mon, 19 Jun 2017 13:31:54 -0000

We’ve been working on supporting emergency services with multiple media for some time in the NENA Next Generation 9-1-1 project.

At least in the U.S., all media offered should be accepted.  The language preference will be negotiated, and based on the result, an interpreting service may be bridged into the call.
As such, a modality preference is not seen as valuable, and in fact, could be considered harmful, as the call taker should be trained to provide an initial answer in all media negotiated and react to the user’s actions thereafter.  An important characteristic of emergency services when viewed from the lens of the slim work is that the mechanisms have to work for the small percentage of cases where the normal mechanisms fail.  In this case, it would be use of a device with language and media preferences labeled by a user who isn’t the usual user of the device when an emergency call is placed.  You do NOT want to assume that the labeled preferences are actually the real preferences.  You bias your responses by the preferences, but you have to allow for variation when the call is actually answered.  So, answering in all offered media is something we would do, regardless of what the highest media preference was. 

Another reason why media preference is not really wanted is that emergency services can use other media even when the user doesn’t prefer to use them.  An audio feed for a deaf caller can be helpful to identify what is happening around the caller.  A video feed for a blind caller (if the device really made the offer) could similarly be useful.

So, I think this is not a useful capability for emergency services and if it was in the offer, I’d tend to want to ignore it and accept all media, with an initial greeting in the preferred language.


> On Jun 19, 2017, at 7:43 AM, Filip Asplund <> wrote:
> In development of emergency services the need of modality preference has been identified.
> It seems to me that the functions specified in draft-hellstrom-language-grouping is what we need for emergency services.
> -- 
> Best regards
> Filip Asplund
> Developer
> Omnitor AB
> _______________________________________________
> SLIM mailing list