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E.212 ENUMService Type Definition E.212 Parameters for the "tel" URI - PowerPoint PPT Presentation

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E.212 ENUMService Type Definition E.212 Parameters for the "tel" URI. Edward Lewis NeuStar IETF 68 ENUM WG meeting. Back-to-Back Items. draft-lewis-enum-enumservice-e212-00.txt To register "E2U+E212" as enumservice Indicates NAPTR has ITU E.212 infomation

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E 212 enumservice type definition e 212 parameters for the tel uri

E.212 ENUMService Type DefinitionE.212 Parameters for the "tel" URI

Edward Lewis


IETF 68 ENUM WG meeting

[email protected]

Back to back items
Back-to-Back Items

  • draft-lewis-enum-enumservice-e212-00.txt

    • To register "E2U+E212" as enumservice

    • Indicates NAPTR has ITU E.212 infomation

  • draft-lewis-enum-teluri-e212-00.txt

    • To define parameters in tel: for E.212

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Plans for the two
Plans for the two

  • Go over comments received so far, get more while here

  • Edit the documents in the coming week(s) post IETF68

  • Submit again as directed (WG or not)

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E 212 for ietf ers
E.212 for IETF'ers

  • E.212 is an ITU document/standard defining meta-data for a mobile-phone telephone number

    • MCC (Mobile Country Code)

    • MNC (Mobile Network Code)

    • MSIN (Mobile Subscriber Identification #)

    • IMSI (International Mobile Subscriber Identity) - the concatenation of the other 3

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A diagram
A diagram





MCC - 3 digits

MNC - 2 or 3 digits

MSIN - up to 10 digits

IMSI - up to 15 digits

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Why ietf documents
Why IETF documents?

  • This is about ENUM

    • Wanting to store the ITU-defined parameters in ENUM

    • This isn't so much about E.212, 'cept that that is the "payload"

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Draft lewis enum enumservice e212 00 txt

  • First, it's a -00 individual, happy to make it a WG document

  • Fills in an ENUM service "application"

  • E2U+E212 means the NAPTR RR has a tel: URI (with extensions in the other draft)

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Comments on that one
Comments on that one

  • Would like a good use case

    • Fair enough, the draft is minimal and am happy to add that. Still in the process of writing it.

  • Is it worth getting a non-SIP ENUM extension defined?

    • Suggestion to use an experimental (x-) but really want a "real" definition

See next slide.

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Use case
Use case

  • With number porting, can't tell the carrier by the number alone

    • Knowing the receiving operator of a call could impact business decisions

      • In Softswitch draft "...interconnection only with trusted carriers"

    • For IM knowing the MCC+MNC can determine the receiving server name

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More comments
More comments

  • What about "aux-info:e212"?

    • Although workable, a few reservations

      • We/WG don't have other "aux-info's" in mind, I don't like to generalize from a single case

      • E.212 is subjectively significant enough to stand on its own, and is reliant on an external (ITU) definition

      • Linking in other (unknown) types would likely slow this process

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First doc question to wg
First doc question to WG

  • Should this be adopted as WG item?

    • What is missing from the application and supporting document?

  • Sub-note: I couldn't find a reliable "how to" to follow when submitting these drafts, so I "undercut" the submission


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Draft lewis enum teluri e212 00 txt

  • This document defines parameters for the tel: URI to hold the E.212 data

    • In the spirit of RFC 4694, but for different data

  • Four parameters are defined, as per earlier slide (MCC, MNC, MSIN, IMSI)

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My goal
My goal

  • I am interested in retrieving the MCC and MNC for a telephone number via ENUM

  • The draft includes MSIN and IMSI parameters for completeness

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  • This draft ought to go to IPTEL

    • No response to that yet from me

  • What's E.212?

    • Should this draft explain it or just refer to the ITU document (now freely available)?

    • When I prepared the draft, I went for not including an explanation but can be convinced otherwise

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More comments1
More comments

  • Need an illustrative use case

    • Working on that, went for brevity in the -00

  • The ABNF is wrong

    • A few pointed this out, you are all right, I'll fix that

  • The URI is wrong

    • Sorry - sigh, I wrote the draft on an airplane and it shows ;) (Goes for the ABNF too.)

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Yet more comments
Yet more comments

  • MCC+MNC xor IMSI?

    • Should the syntax require either both MCC and MNC be present or the IMSI be present?

    • My response is - that's the probable use case, but does this have to be encoded in the syntax rules? I prefer to let the syntax be freer than the use

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And more comments
And more comments...

  • Isn't it unwise to have the IMSI, MSIN, and maybe even the MCC and MNC in a public database?

    • I'd agree with that, but the drafts are just providing a means to put this in ENUM and not saying that the data would be public

    • Not all DNS servers are on public networks

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Second doc questions
Second doc questions

  • Should this be an ENUM WG doc or go ask IPTEL WG to adopt this?

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Well i m out of slides
Well, I'm out of slides

  • Discussion?

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