Re: [sipcore] I-D Action: draft-mohali-sipcore-reason-extension-application-01

[Paul Kyzivat <[e-mail]>]

(As individual)

Marianne,

I'm still struggling to make sense of this in the form proposed.

I look at the various cause values, and all the descriptions are of the 
form. E.g.:

       Cause value: 2
       Reason text: Freephone
       Description: A Freephone application has influenced processing of
       the call (e.g. by translating a dialed Free Phone number to a
       routable directory number).

I can't figure out how to make any actionable decision based on this.
Rather, it seems I need to make a number of leaps of faith before I can 
decide what to do.

For instance, if I get an error, it *might* be because I dialed a 
freephone number, and it isn't supported from my calling location. (E.g. 
maybe I'm dialing [phone], but I'm doing so from France, and 
calling that number is only supported in the USA.

But getting a application reason code with cause 2 doesn't really tell 
me that is what happened. It could be that the call indeed was routed 
through a freephone application, and it properly routed the call, and 
the call failed for some other reason. But the cause is there because 
the application *did* influence the call routing.

Also, these "applications" are not, AFAIK, mutually exclusive. E.g. I 
could be using a prepaid service to make a directory assistance call 
that costs extra $$$ that I don't have credits to cover. But you can't 
include two cause values for the same protocol. (But it is true that you 
*can* have a number of servers each put one cause into *their* H-I entry.)

So *maybe* I would see that my call failed, and that there is both a 
reason indicating a prepaid application on one H-I entry, and another 
indicating a another H-I indicating a directory service application. But 
what can I conclude from that?

Bottom line, I just can't make sense how this could be used in a well 
defined and interoperable way.

	Thanks,
	Paul

On 2/28/2011 9:58 AM, [e-mail] wrote:
> Hello,
>
> Here is the new version of the draft.
> Main changes are following:
> - More details about the registration procedure for new values
> - Clearer text in section 3.2
> - Add of Public and Private status for registered values.
> - Add of a range for cause values registration
>
> Best Regards,
> Marianne Mohali
>
> -----Message d'origine-----
> Objet : New Version Notification for
> draft-mohali-sipcore-reason-extension-application-01
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>
> 	Title           : Extending the Session Initiation Protocol
> (SIP) Reason Header for Applications
> 	Author(s)       : M. Mohali, B. Chatras
> 	Filename        :
> draft-mohali-sipcore-reason-extension-application-01.txt
> 	Pages           : 10
> 	Date            : 2011-02-24
>
> This document defines a new protocol value "Application" for the
> Reason Header field and a new IANA Registry for registering
> application types.  This new value enables signaling that a request
> or response has been issued as a result of a decision made by a
> particular type of application or that an initial request has been
> retargeted as a result of an application decision.
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-mohali-sipcore-reason-extensio
> n-application-01.txt
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> Below is the data which will enable a MIME compliant mail reader
> implementation to automatically retrieve the ASCII version of the
> Internet-Draft.
>
> <ftp://ftp.ietf.org/internet-drafts/draft-mohali-sipcore-reason-extensio
> n-application-01.txt>
>
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