1. Technical and Operational Aspects
EC Meeting, Brussels – 24 April 2002
ETNS Concepts
Technical and Operational Aspects
Marco Bernardi
NeuStar, Inc

2. Table of Contents ETNS Reference Model
Routeing of ETNS calls and distribution of routing numbers information
Signalling
Centralised Database

3. Reference Model (I) ETNS Reference Model as defined by ETSI
Service Provider
ETNS Customer
Registrar
Non-call Related
Call Related
Assisted Network
Service Producer
Serving Network
Service Network
Terminating Network
Calling Party
Called Party
This is not a business model

4. Reference Model (II) Call Related: Assisted Network Serving Network
Originating network that routes an ETNS call to a Serving Network
Serving Network
Network that performs number translation functions and routes a ETNS calls to the Service Network
Service Network
Network that hands an ETNS call over to a ETNS Service Producer to perform service specific functions, and then routes it to the Terminating Network
Service Producer
Entity that provides the ETNS service and performs number translation functions
Terminating Network
Network where the called party is connected

5. Reference Model (III) Non-call Related: Registrar
Entity responsible for the assignment of ENs and distribution of Routing number information
ETNS Service Provider
Entity that provides one or more ETNS service(s) to ETNS subscribers on a contractual basis and is not involved in real-time control of the service
ETNS Customer
Entity that subscribes to ETNS services through an ETNS Service Provider

6. Routeing of ETNS Calls (I)
Routeing of ETNS calls based on the use of number translation capabilities
Flexible routeing architecture open to competition
Different methods (Double translation method A and B) based on use of different network capabilities
European Number (EN) Routeing Number (RN)  Terminating Number (TN)
RN used to identify either the Service Network (RN2) or Service Network and the ETNS called party (RN1)
RN is an E.164 national number; Non E.164 numbers (INRA – E.363) may be a future alternative
Structure and assignment of RNs are national matters. No more than 7 digits required to identify the Service network
TN used to identify the called party
TN is E.164 national number

7. Routeing of ETNS Calls (II)
Double Translation Method A: speech path between SgN and SN
Service Producer
ETNS
Translation DB EN RN RN TN
Assisted Network
Transit
Network
Service Network
Serving Network EN EN RN TN
Speech Path
Terminating Network
Signalling Path TN

8. Routeing of ETNS Calls (III)
Double Translation Method B: signalling path between SgN and SP SA
Service Producer
ETNS Translation DB TN EN
Assisted Network
Serving/Service Network
Terminating Network EN TN TN EN
Speech Path
SA =Signalling Address (e.g. SCCP Global Titles)
Signalling Path

9. Distribution of RNs SgN1 SgN2 SgN3 SP1 SP2
Distribution of RN information is non-call related function
RNs are distributed when:
an EN is assigned
an EN is ported
an EN is deactivated
Service Provider request
RNs distributed with a centralised approach
SgN1
SgN2
SgN3
Registrar
SP1
SP2

10. Signalling Best solution = Routeing method A with RN1
Routeing Method A with RN1 (RN identifies both the Service Network and the ETNS called party) can be implemented with existing signalling capabilities (ISUPv1)
Routeing Method A with RN2 (RN identifies only Service Network) requires transport of both RN2 and EN
Routeing method B can be implemented with standard signalling systems that use SCCP Global Titles; based on the availability of SA with international significance
Best solution = Routeing method A with RN1
- available now with existing network capabilities

11. Centralised Database (I)
Off line centralised database to perform registrar function. User friendly web-based interface to access the database –
Registrar database users
ETNS Service providers, Serving Networks and NRAs
Registrar database functions
Check ENs availability
Obtain ENs
Distribute RNs
Facilitate NP process between Donor and Receiving ETNS SP
Access training and information material online
ETNS level performance
1 wd to reserve EN
2 wd to change and distribute RN

12. Centralised Database (II)
Sunrise mechanism and dispute resolution process
Conflicting EN reservations, SP and SgN registration
ETNS Customer Service Manager
+44 (0)

13. References Technical standards relating to ETNS (www.etsi.org)
EN : Management of the European Telephony Numbering Space (ETNS)
EN : Routeing of Calls to European Telephony Numbering Space (ETNS) Services
EN : Number Portability for Pan-European Services*
* revised version subject to approval
NOTES:
Probably won't use, but will be available in published version.
Revised technical standards currently subject to revision.

14. Questions ?

15. Glossary
CEPT – Conference of the European Posts and Telecommunications
EN – European Number
ERO – European Radio Office – soon ECO European Communication Office
ETNS – European Telephony Numbering Space
ECC – European Communication Committee
ETSI – European Technical Standards Institute
RN – Routeing Number
SgN – Serving Network
SN – Service Network
SP – Service Provider
TN – Terminating Number

16. NeuStar’s mission
NeuStar is the leading provider of database, clearinghouse and registry services that enable network operators and service providers to interoperate
NeuStar is a neutral trusted third party
NeuStar main areas
Registry services: .biz, .us, North American Numbering Plan, Numbering Pooling, ETNS
US Local Number Portability Administration (NPAC)
Convergence IP and PSTN: ENUM
OSS clearinghouse services: Care