1. draft-pfautz-lind-enum-carrier- 00.txt IETF 60 4 August 2004 Steven D. Lind

2. 4 August 2004draft-pfautz-lind-enum-carrier-002 Carrier ENUM Need to distinguish between private (intra- enterprise, intra-carrier, CUG) uses of ENUM technology versus public ENUM Private uses are legitimate but separate from the question of whether the public ENUM infrastructure can/should support carrier interconnection as well as end user reachability

3. 4 August 2004draft-pfautz-lind-enum-carrier-003 draft-pfautz-lind-enum-carrier-00.txt Objective Define mechanism to allow public ENUM tree (e164.arpa) to support both end user applications and carrier interconnection –Avoid provisioning and performance issues associated with end user opt-in and control of Tier 2 for carrier registration while preserving user options and protections for end user registration –Leverage existing work toward implementation of end user ENUM and carrier scale for greatest efficiency of both flavors of public ENUM

4. 4 August 2004draft-pfautz-lind-enum-carrier-004 A Delicate Balance End users want privacy to minimize unwanted communications Service providers want to maximize call completion –To/from their subscribers –Keep communication on the IP-plane –Single tree (or absolute minimal set of trees) to find call completion information

5. 4 August 2004draft-pfautz-lind-enum-carrier-005 Opt-in Each country will have its own unique privacy regulations Three types of “opt-in” (not all good; not for all situations) –User-initiated –User-notified –User-ignored What type of opt-in might be required for a translation from “+1 973 236 6787” to: –“sip:+19732366787@sip.foo.com” –“sip:+19085617228@sip.bar.com” –“mailto:+19732366787@email.foo.com”?

6. 4 August 2004draft-pfautz-lind-enum-carrier-006 Carrier Trees Some infrastructure-related information (e.g., caller name) may properly reside in private DNS resources Basic communication completion information in private trees defeats basic value of ENUM Fewer trees lead to admission control problems –Who controls admission –What is criteria Many trees lead to call completion problems –How to maximize chance of success –Do not want to replicate E.164 resource problems

7. 4 August 2004draft-pfautz-lind-enum-carrier-007 draft-pfautz-lind-enum-carrier-00.txt Proposal In Tier 1, replace single NS record with 2 non-terminal NAPTRs with different service fields (E2U – end user; E2C – carrier) that point to the respective Tier 2s Carrier record to be populated by PSTN carrier of record for the number Querying client decides which record(s) to make use of.