Re: [Ecrit] URN: for people with hearing loss

[Gunnar Hellström <[e-mail]>]

I doubt that the URN is the right mechanism for separating different 
technologies and media used for the emergency call. That gets in 
conflict with the specification of service type on the application level 
that was the original idea of using subtypes in the URN.  You cannot 
specify "coastguard" and "text" at the same time, or you need a 
complicated logic that allows to hang the technology specification as a 
sub-service on any of the other services ( "sos.coastguard.text" ).

The IETF SLIM WG is working with indication of desired language and 
modality.  Emergency service is one of the main applications. We have 
only identified spoken, written and signed modalities, but also briefly 
discussed if "message" would be needed, as would be the need for SMS and 
fax. (with written modality we mean real-time text declared as text 
media. )  Maybe that mechanism can be considered for your needs.

If you continue on the subtype track, I also agree that "hearing-loss" 
is not a good term to use, and also not "text".

Maybe "message" if that is what the subtype is intended to handle. Or 
did you intend to handle all mixes of modality that can occur:   sms, 
fax both ways, fax one way and speech the other, real-time text both 
ways, real-time text one way and speech the other, sign language both 
ways, instant messaging both ways, instant messaging combined with 
speech etc. ? How would the device  know for which modality preferences 
to use the service subtype and when to use the regular "sos".

Gunnar

Den 2017-07-12 kl. 00:37, skrev Henning Schulzrinne:
> Several countries have separate numbers (some short, some toll-free) where
> people can send an SMS or fax for emergency assistance. (The US has made
> the decision to use 911 for SMS as well, but that's not relevant for this
> discussion. In those countries, such calls need to be routed separately and
> you can't tell whether you are going to send a fax when dialing...)
>
> One possibility is to use *sos.text *(with the understanding that this
> includes fax; none of the countries I checked separate those), but I'm not
> terribly happy with this label.
>
> I want to avoid something like *sos.hearing-loss* since this assumes that
> only people with hearing loss can use the service. Some countries do
> require some kind of registration, but this does not seem like something we
> want to encode in a URN.
>
> Henning
>
>
>
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Gunnar Hellström
Omnitor
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