Subject: [Sipping] KPML Digit Maps

From: "Eric Burger" <[email-masked]>
Date: Wed, 12 Nov 2003 11:04:55 -0500

Right now, KPML specifies 3 mandatory digit map styles:
 - Regular Expressions
 - H.248.1 digitmap
 - J.162   digitmap

Choices are:
 1. We can pick one, and only one digit map style.
 2. We can negotiate the style, with a mandatory
    to implement for guaranteed baseline
    interoperability.

There was a leaning in Minneapolis towards option #2.  The mechanism roughly would be to put a parameter on the event: kpml header in the SUBSCRIBE, with a suitable failure if the style is not supported by the KPML server.  Given that there are already three (or four, see below) different digit map styles, this probably would become an IANA-registered tag.

For the people that think expression evaluation is computationally complex, one of the styles can be a hardcode of "match digit."  [Ed. Note: this mode is not really useful for the reasons given, in that expression evaluation is not computationally complex, especially when compared to the computational complexity of running a SIP stack or (if on a single processor) the complexity of detecting DTMF).]

Comments?

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