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Re: [Ecrit] Summary of compromise proposal

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 01 September 2016 15:51 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "R.Jesske@telekom.de" <R.Jesske@telekom.de>, "rg+ietf@randy.pensive.org" <rg+ietf@randy.pensive.org>, "ecrit@ietf.org" <ecrit@ietf.org>
Thread-Topic: [Ecrit] Summary of compromise proposal
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Date: Thu, 01 Sep 2016 15:51:48 +0000
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Subject: Re: [Ecrit] Summary of compromise proposal
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Hi,

Please note that my proposal allows Call-Info in INFO, while still using an info package.

I think that more or less gives everyone what they want.

Regards,

Christer

-----Original Message-----
From: Ecrit [mailto:ecrit-bounces@ietf.org] On Behalf Of R.Jesske@telekom.de
Sent: 01 September 2016 18:48
To: rg+ietf@randy.pensive.org; ecrit@ietf.org
Subject: Re: [Ecrit] Summary of compromise proposal

Hi Randy,
we would like to support your proposal. Even I would have liked to see the Call-Info header within the INFO for the reasons I described on the SIPCORE list.

Best Regards

Roland 

-----Ursprüngliche Nachricht-----
Von: Ecrit [mailto:ecrit-bounces@ietf.org] Im Auftrag von Randall Gellens
Gesendet: Donnerstag, 1. September 2016 15:36
An: ecrit@ietf.org
Betreff: [Ecrit] Summary of compromise proposal

Hi Everyone,

I want to summarize the compromise that was proposed a couple weeks ago, for clarity:

- The metadata/control object is associated with the INFO package
- The MSD is not associated with the INFO package and is always sent using Call-Info to refer to it
- PSAP requests an updated MSD mid-call by sending an INFO containing a metadata/control object requesting an MSD, per the INFO package, with "Content-Disposition: info-package", and no Call-Info header field
- IVS sends an INFO with a metadata/control object containing an ACK with "success=true" indicating it sent the updated MSD
- IVS attaches an updated MSD in any convenient message; typically this will be the INFO with the ACK


This means that the INFO package defines a clean request/response protocol, while the MSD remains Additional Data per RFC 7852.

For the initial MSD (unchanged by the compromise), the MSD is included in the INVITE, referenced by a Call-Info header field and can be acknowledged in a final response (e.g. 200, 4xx, 6xx) using a metadata object referenced by a Call-Info header field.

The authors believe this compromise addresses the concerns raised, and provides a mechanism that can be easily extended in other documents (such as car-crash or future documents).

--
Randall Gellens
Opinions are personal;    facts are suspect;    I speak for myself only
-------------- Randomly selected tag: --------------- People demand freedom of speech to make up for the freedom of thought
which they avoid.                                       --Kierkegaard

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