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Combined User and Carrier ENUM in e164.arpa draft-haberler-carrier-enum-00.html

Combined User and Carrier ENUM in e164.arpa draft-haberler-carrier-enum-00.html. Michael Haberler mah@eunet.at 5.8.2005. The problem we‘re addressing:. ENUM under e164.arpa currently means ‚User ENUM‘ (by opt-in) only.

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Combined User and Carrier ENUM in e164.arpa draft-haberler-carrier-enum-00.html

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  1. Combined User andCarrier ENUM ine164.arpadraft-haberler-carrier-enum-00.html Michael Haberler mah@eunet.at 5.8.2005

  2. The problem we‘re addressing: • ENUM under e164.arpa currently means ‚User ENUM‘ (by opt-in) only. • A carrier-of-record has no standard place to deposit, for instance, Point of Interconnect (POI) information. • VoIP peering BoF documented interest • IP interconnect info through „zone cohabitation“ doesnt fly • Interconnect resolution currently pressed towards private trees • Consequences: • Low per-tree resolution rates • As announced by, and limited to „tree club members“ • Alternative is multi-tree resolution – does not scale well, aliasing problems • No predefined scheme for global interoperability (!) • Private tree solutions tend to lack WRT to standards – reducing operator choice long-term • Registry cost: • Repeated OPEX per registry (assuming different operators) • No synergy between Carrier and User ENUM operation • this might imply failure of User ENUM – especially in small countries • less pressure on regulators to get some form of ENUM going at all – slower footprint for User ENUM

  3. Requirements for a solution • single DNS lookup • no shape change for User ENUM • additional functionality/code only for carrier resolvers. • work with closed and open number plans – avoid wildcards / enable DNSSEC • no new NAPTRs just for resolution • deployment in finite time • local decisions as far as possible • no revisiting of global agreements like the interim procedures • Address privacy concerns – disclosure of unlisted numbers, user identity

  4. proposal • add a Carrier ENUM subtree (branch) under e164.arpa • Branch location is a per-CC decision • Provide mechanism to locate country CE subtree • Carriers may populate that subtree • What a „carrier“ is is a national matter • This suggest a branch under <cc>.e164.arpa • But also enable different scenarios like: • <cc>.carrier.e164.arpa or • Carrier.<NPA>.<cc>.e164.arpa • Regarding resolution and management, Carrier and User ENUM tree should be „ships in the night“

  5. sdl = 0 arpa carrier carrier carrier e164 1 1 4 4 sdl = 1 9 4 9 sdl = 4 7 9 7 7 1 1 1 1 2 2 2 2 3 3 3 3 … … … … Branching options: where? .

  6. Example implementation • Code at  http://mah.priv.at/enum/dist/ • Zone files included & also in DNS • Complexitiy: • Determine subdomain location • Fetch sdl RR from country code zone • Conditionally insert „carrier“ label in domain as per sdl

  7. Proposed route • Adopt CE as WG item • Discuss and suggest a CE mechanism • Work in sdl RR • Defer policy issues to VoIP peering • Adapt 3761 to cater for CE mechanism

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