1. Slide title In CAPITALS 50 pt Slide subtitle 32 pt Infrastructure ENUM David Seaton Director Product Marketing Ericsson

2. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence2 What is ENUM? The mapping of Telephone Numbers to Uniform Resource Identifiers (URIs) –E.164 NUMber Translation –E.164 NUMber to URI Mapping –Electronic NUMbering –The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application –TElephone NUmber Mapping –ENUMeration

3. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence3 There are may variations on ENUM! User ENUM Private ENUM –Operator ENUM –Enterprise ENUM –Carrier ENUM Federation ENUM Infrastructure ENUM

4. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence4 Infrastructure ENUM Infrastructure ENUM is defined as the use of the technology in RFC3761 [2] by the carrier-of-record for a specific E.164 number [3] to map a telephone number into a URI [4] that identifies a specific point of interconnection to that service provider's network that could enable the originating party to establish communication with the associated terminating party. It is separate from any URIs that the end-user, who registers their E.164 number, may wish to associate with that E.164 number.

5. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence5 Infrastructure ENUM vs Public ENUM Infrastructure ENUMPublic ENUM Who decides to participate in the ENUM scheme? Service ProviderCountry (Administration) ENUM subscribers By whom is information required?Service Provider onlyOptional information By whom is information supplied?Service ProviderENUM subscribers Who can upload information?Service Provider serving the E.164 number Any single ENUM Registrar per E.164 number How is information populated?All E.164 numbers inserted, no opt-in for single subscriber Opt-in for each ENUM subscriber Who has access to information?Intended for Service Provider only Any entity Is retrieval of information controlledYesNo Is a domain definedNoYes: e164.arpa

6. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence6 How ENUM works? take an E.164 phone number - +44 2476 562000 turn it into a FQDN - 0.0.0.2.6.5.6.7.4.2.4.4.e164.arpa. returns list of URIs sip:david@carriera.uk query the ENUM (for NAPTR) mailto:david.seaton@ericsson.com IN NAPTR 100 100 "u" E2U+sip !^.*$!SIP:david@carriera.uk!.

7. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence7 sip:joy@carriera.uk sip:fred@carriera.uksip:jane@carrierb.uk sip:david@carrierb.uk session DNS SRV lookup carrierb.uk sip:david@carrierb.uk SIP Session Establishment DNS IMS

8. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence8 E.164 Session Establishment SIP server tel:+442476562000 session DNS SRV lookup carrierb.uk sip:david@carrierb.uk DNS 0.0.0.0.2.6.5.6.7.4.2.4.4.e164.arpa.... NAPTR... "!^.*$!sip:david@carrierb.uk!" ENUM sip:joy@carriera.uksip:fred@carriera.uksip:jane@carrierb.uk sip:david@carrierb.uk IMS

9. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence9 Benefits of ENUM Centralised database for E.164 numbers allowing easier management Allows fragmentation of number plan across many softswitches Can be used to support number portability Can be used to support number translation services

10. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence10 Limitations of standard ENUM ENUM provides a translation from the dialled E.164 number to URIs It does not take account of point of origin of a call Therefore, no ability to route on point of origin –Routing of emergency calls –Routing to an appropriate point of interconnect

11. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence11 ENUM Joy David Jane Fred Operator AOperator B standard ENUM IMS AGW Dialled Number POI A POI B

12. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence12 ENUM Joy David Jane Fred Operator AOperator B standard ENUM IMS AGW Dialled Number POI A POI B

13. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence13 ENUM Joy David Jane Fred Operator AOperator B enhanced ENUM IMS AGW POI A POI B Dialled Number & Originating Line Identity

14. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence14 ENUM Joy David Jane Fred Operator AOperator B enhanced ENUM IMS AGW POI B POI A POI B Dialled Number & Originating Line Identity

15. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence15 Why enhanced ENUM ? In addition to the the base ENUM standard, enhanced ENUM will –Provide location information for each end point allowing Calls to be routed to the optimum shared resources location, e.g Media servers Calls to be routed to other networks via the optimum gateway Calls can be routed to match historic routing patterns Correct handling of emergency calls

16. Slide title In CAPITALS 50 pt Slide subtitle 32 pt Thank You

17. Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Commercial in confidence17