Re: [Ecrit] IETF ECRIT Design Team on Premature Call Termination

You can get voicemail from call forwarding, network congestion, etc, in
addition to making a call.  UI can't fix that.  Interestingly, I don't
recall ever reading anywhere else about the feature you described.  I wonder
if in fact it is implemented widely.  

There isn't anything magic about cellular networks AFAIK; what makes you
believe that cellular networks should be treated differently for emergency
calls?

I'd bet that the outcome where CPH is employed is quite a bit higher than
those where the caller can hang up.  People under stress do stupid things
quite often.  Call takers tend to have better judgment on when a call should
be taken down.  YMMV

I agree that the mechanism must fail safe.

Brian

From: Randall Gellens [mailto:randy@qualcomm.com] 
Sent: Friday, October 17, 2008 7:21 PM
To: Tschofenig, Hannes (NSN - FI/Espoo); ext Marc Linsner; Brian Rosen
Cc: ECRIT
Subject: Re: [Ecrit] IETF ECRIT Design Team on Premature Call Termination

At 4:13 PM +0300 10/9/08, Hannes (NSN - FI/Espoo) Tschofenig wrote:

Folks, we need to get things going. Here is my suggestion:

1) Read through Brian's draft again
http://tools.ietf.org/id/draft-rosen-ecrit-premature-disconnect-rqmts-00
.txt
2) Take a look at the previously received comments
   - during the IETF meeting
   - after the meeting on the list
   Here are some links: 
http://www.ietf.org/mail-archive/web/ecrit/current/msg05450.html
http://www.ietf.org/mail-archive/web/ecrit/current/msg05447.html
3) Determine whether we can agree on some of the requirements.

Here is one issue:

In jurisdiction where there is no CPH and PSAP calls back the originator,
is CPH and call-back perceived different?(Ted)

Yes it's different. Real problem is you can get Voicemail.. Instead of
the originator.
Originator can also make a call, with CPH, originator can't make another
call. (Brian)

Currently, cell phones don't implement CPH, but most do implement a feature
that, for some time period following an emergency call, the phone can't be
used to place a new call unless the user hits "end call" twice.  The intent,
as I understand it, is to "reserve" the phone for PSAP call-back, while
allowing the user to over-ride this reservation. 

It seems to me that this suggests several things that are worth noting: A
lot can and will need to be done in the UI; the user needs to be able to
over-ride any restrictions; keeping the call itself up is not necessarily
the optimal solution, especially in cellular networks.

-- 
Randall Gellens
Opinions are personal;    facts are suspect;    I speak for myself only
-------------- Randomly-selected tag: ---------------
I never travel without my diary.  One should always have something
sensational to read on the train.
   --Oscar Wilde

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