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

Randall Gellens <randy@qualcomm.com> Fri, 17 October 2008 23:22 UTC

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Date: Fri, 17 Oct 2008 16:20:38 -0700
To: "Tschofenig, Hannes (NSN - FI/Espoo)" <hannes.tschofenig@nsn.com>, ext Marc Linsner <mlinsner@cisco.com>, Brian Rosen <br@brianrosen.net>
From: Randall Gellens <randy@qualcomm.com>
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Cc: ECRIT <ecrit@ietf.org>
Subject: Re: [Ecrit] IETF ECRIT Design Team on Premature Call Termination
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Re: [Ecrit] IETF ECRIT Design Team on Premature Call Ter
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
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I never travel without my diary.  One should always have something
sensational to read on the train.
   --Oscar Wilde
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