CarrierENUM

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Title: CarrierENUM

1

Glenn Marschel President NetNumber,
Inc. gmarschel_at_netnumber.com
2
About NetNumber
Background

Provider of next generation addressing solutions
to service providers based on the NetNumber
TITAN platform.
Common platform for legacy SS7/C7 addressing
services and next generation Carrier-ENUM
addressing services
Carrier-ENUM Private, secure, operator-controlled
discovery of IP-based services.
MMS Portability-corrected addressing for
cross-operator MMS services.
IMS Portability-corrected I-CSCF discovery from
a dialed E.164.
VoIP Service provider controlled end-to-end
VoIP addressing.
Number-Portability Highly efficient portability
resolution via SS7, SIGTRAN, SIP DNS
interfaces.
Support provided for both AIN and SRF portability
solutions.
GTT Subscriber specific resource discovery via
GTT translations and SCCP addressing techniques.
SMS Portability-corrected Service Provider ID
(SPID) to enable SMS direct-connect between
mobile operators.

3
NetNumber Clients
Background
4
ENUM Implementation Background
Background

Broad industry support exists for the use of ENUM
as a standard query/response protocol for the
discovery of IP-services associated with a dialed
number.
Two distinct ENUM models have been identified
User-ENUM End-user controlled Tier-0, Tier-1,
Tier-2 infrastructure deployed on the public
Internet that enables a user to associate
IP-services with his/her E.164 number under the
domain e164.arpa.
Carrier-ENUM Service-provider controlled ENUM
database used to facilitate the interconnection
of IP-based services between carriers/operators
by translating a dialed E.164 into a
portability-corrected network entry-point address
for a destination carrier.
Sometimes referred to as Operator-ENUM or
Infrastructure-ENUM.

5
Carrier-ENUM In ProductionUse Existing SPID
databases to fulfill the role of the root
Background

Service-Provider-ID Database Model
(SPID-Resolution) Utilizes existing industry
sources of number-block-assignment and
number-portability data to determine which
destination operator controls a given dialed
E.164. (No requirement for Tier-0 and Tier-1
root infrastructure)
Central-database Used by mobile operators in
USA today for MMS.
North-American portability database (NPAC)
identifies the destination operator.
Block-assignment Used in non-ported-networks
to support MMS.
Simple number-block assignment data identifies
the carrier.
IMSI-database Use mobile operators in Europe
to interconnect MMS.
MAP SRI-for-SM query returns portability-correct
ed IMSI address with MCC MNC that identifies
destination carrier.

6
Resolution Logic
Architecture

The Carrier-ENUM address resolution process
breaks down into two logical steps
Step 1 Identify the destination operator
Given a dialed E.164, Step-1 answers the
question Which destination carrier is
responsible for this dialed number?
The key issue in Step-1 is number-portability.
Step 2 Apply local policy to the selection of an
appropriate interconnect address.
Given a portability-corrected destination carrier
ID from Step-1, Step-2 answers the question
Which interconnect address should I use for this
destination carrier?
The key issue in Step-2 is selection of an
interconnect address that takes into account the
relationship that exists between the originating
carrier and the destination carrier.
Should this session be routed directly to the
destination carrier or should it be routed via an
intermediary service provider?

7
For More Information
GSMNA Addressing Task Force Carrier-ENUM
Implementation Guidelines
February 2006
8
Conclusions
Summary

Multiple vendors are delivering Carrier-ENUM
solutions today using the existing industry
databases with no requirement for a new Tier-0,
Tier-1 and Tier-2 DNS root
On-site or third-party hosted solutions.
Multiple resolution models utilized on a
country-by-country basis.
Central portability database
Number-block assignment database.
IMSI query.
ENUM provides a standard query/response protocol
but DNS-delegation through a Tier-0, Tier-1,
Tier-2 infrastructure is not a requirement for
Carrier-ENUM.