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DTMF-Relay Info-Package draft-kaplan-dispatch-info-dtmf-package-00. Hadriel Kaplan. Terminology/Definitions. DTMF: Dual-Tone Multi-Frequency (tones) KPML: Key-Press Markup Language (RFC 4730) Hadriel: the messenger (don’t shoot). The Problem. DTMF is just like other media: It has to work

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dtmf relay info package draft kaplan dispatch info dtmf package 00

DTMF-Relay Info-Packagedraft-kaplan-dispatch-info-dtmf-package-00

Hadriel Kaplan

terminology definitions
Terminology/Definitions
  • DTMF: Dual-Tone Multi-Frequency (tones)
  • KPML: Key-Press Markup Language (RFC 4730)
  • Hadriel: the messenger (don’t shoot)
the problem
The Problem
  • DTMF is just like other media:
    • It has to work
  • And like media, there is no one global “codec”
    • 2833/4733, INFO, KPML, Notify-1, Notify-2
  • The DTMF world isn’t what we hoped it would be – it has not converged on one solution
    • It has to be “negotiated” 
why isn t the world perfect
Why isn’t the World perfect?
  • DTMF needs to go the signaling path sometimes
    • SIP applications (calling card, IVR, etc.)
    • SIP to H.323/BICC/ISUP/etc.
  • Didn’t we solve this with KPML?
    • YES!!!
    • It’s the greatest solution ever devised! We’re geniuses!
    • But some pesky, horrible people seem to ignore us
what s wrong with kpml
What’s wrong with KPML?
  • Nothing. It’s just not that popular
  • Why?
    • Some systems prefer not to create two subscriptions for every call just in case someone presses a button someday
    • What they have “works” right now, so why fix it?
    • This is just a button press – why make it more complicated than that?
    • Lowest-common-denominator usually wins
what else is there
What else is there?
  • INFO
    • At least 2 flavors: “dtmf-relay” is the big one
    • 3GPP has something too (but not really for this)
  • NOTIFY
    • At least 3 flavors, but not as popular
    • One flavor actually sends 2833 packets as its payload! (yes, each 2833 packet… so many, many Notify’s)
the proposed solution
The Proposed Solution
  • Let the Wookie win: “standardize” the popular INFO one
    • It’s really, really simple (and it works)
  • Three ways to do that:
    • Publish an A-D sponsored RFC
    • Publish an individual RFC (non-IETF)
    • Publish an Info-Package
      • That was why we actually did Info-Packages, after all
  • Current draft picks #3
will this succeed
Will this succeed?
  • If we do an Info-Package for dtmf-relay would vendors go do that, vs. just legacy INFO?
    • I Dunno
  • Most of our issues/concerns with INFO never really applied to dtmf-relay
      • The Mime type was unique
      • The purpose of the INFO was unambiguous
      • The “negotiation” could be done with Accept header

No problem to solve here, move along…

options
Options
  • I am not advocating a new mini-WG for this
    • Though I do have an acronym:

Common Info Dtmf-Event-Relay (CIDER)

  • We could just ignore the whole topic
    • That hasn’t made it go away
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