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Re: [Ecrit] comments on ECRIT requirements



At 03:34 AM 8/6/2005 -0400, Andrew Newton wrote:
Roger,

Thanks for doing the hard work.

My comments are in-line:

On Aug 6, 2005, at 3:05 AM, Roger Marshall wrote:
Comments to A6: I think we all have a sense of what
backward-compatibility means, which (at least to me) would equate
to the
idea that whatever protocol that ecrit comes up with for emergency
routing, that it'll work for legacy (pre-ecrit) handsets.

Perhaps a simpler, alternate wording is in order, such as:

A6.  Backward-compatible:"> Emergency routing protocols and functions
MUST be backward-compatible for use with existing devices.

I still do not understand this requirement.

I also do not understand this requirement (now).

If this working group
creates a method for emergency call routing that does not already
exist, which is the purpose of this group, then by definition it will
not be backwards compatible with existing devices.  When I read this
requirement, to me it indicates that we either are not producing a
new standards track document or we should close down the working group.

Perhaps there needs to be more definition with regard to the meaning
of "backward-compatible".

I agree here - maybe we need to define first exactly what this phrase means to everyone.


Is it backwards-compatible message routing?

Is it backwards-compatible signaling protocol and which extensions?
meaning: for SIP, is it only 3261 elements, or 3261 plus the 34 PS-RFCs since 3261?


Is it backwards-compatible addressing?

Which, or all 3?



-andy

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cheers,
James

                                *******************
                Truth is not to be argued... it is to be presented.

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