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© GSMA 2009
All GSMA meetings are conducted in full compliance with the GSMA’s anti-trust compliance policy
Role of ENUM in NGN Interconnect
A Dodd, GSMA
ETSI 3GPP release 8 IMS Implementation,
Deployment & Testing
24th Nov 2010
© GSMA 2010 2
Brief History of the GSMA
Founded in 1987 by 15 operators committed to the joint development of a
cross border digital system for mobile communications.
Became the global trade group for the mobile industry, representing the vast
majority of mobile phone networks across the world
– Now encompassing commercial, public policy and technical initiatives,
ensuring mobile services work globally
The Association’s members now serve more than 3.7 billion customers
– More than 750 operator Members across 219 countries
– Over 200 Associate Members (manufacturers and suppliers)
Success built on open standards, interoperability and scale
© GSMA 2010 3
Next Generation Network Migration
Voice migrating to SIP based implementations
Legacy services are being upgraded, eg to RCS
VoLTE services use IMS exclusively
Legacy end of life replacement
Industry is migrating to IP
Voice
SIP based
RCS
IMS based
LTE
IMS based
© GSMA 2010 4
IMS Adoption
Source:
Infonetics
100m FNO
subs on
IMS in 2010
© GSMA 2010 5
IPX introduces the managed IP interconnect option
IPX completes the portfolio of options necessary to support
Legacy Services
NGN Services
Internet Applications
Country 1
NGN Interconnect Context
TDM
NGN
Service
Providers Managed
Interconnect
Managed
Interconnect
Unmanaged
Apps
TDM
NGN
Service
Providers
Apps
© GSMA 2010 6
Routing Challenges
IMS
TDM
IMS
TDM
Phone Numbers
Porting
Phone Numbers
Porting
Telephone numbers mean
nothing to IP networks
Subscribers move from one
network to another
Subscribers will move from
TDM to IMS
Dynamic situation
Risk of incompatibility
between networks
Risk of quality reduction
Risk of unsuccessful routing
Service platform will change dynamically
© GSMA 2010 7
Interconnect Risks
LTE
RCS
GSM
LTE
RCS
GSM
Originator Number Range Holder
Ported Subscriber
Recipient
Routing in the wrong format can
add costs to interconnect
Routing via suboptimal routes
can add costs to interconnect
Routing through the original
number range holder may break
end to end IP connectivity
International
Carrier/Hub
TDM
IPX
GRX?
Desired path
© GSMA 2010 8
IMS and ENUM
IMSIMS
GSMA recommend ENUM,
an IETF standard
Designed for number lookup
Phone Numbers are
translated into routing info
Results indicate technology
to use, IP or TDM
Does not impact number
schemes in country
Suitable for internal and
external routing
Any service type, eg Voice,
text, video, presence, etc
Clean all IP solution
Make NGN routing info available to partner networks
VoLTEVoLTE
Carrier
ENUM
Query Number for routing URI
GRX/IPX
Internal network routing
External routing
Carrier
ENUM
Input: Number
Output: URI “Dialed” Number
© GSMA 2010 9
Carrier ENUM
GSMA Tier 0
Tier 1
Tier 2
DNS for Phone Numbers
GSMA recommends Carrier ENUM automated discovery of data
IETF open interoperable standard
Private and Secure
© GSMA 2010 10
Ask the destination about a number before taking routing decisions
Resolve URI result, select appropriate technology and route
Concept similar for directly interconnected operators
Country 1
Basic Routing Use Case
TDM
NGN
Managed
Interconnect
Managed
Interconnect
Unmanaged
Apps
TDM
NGN
Step 1 ENUM Query
Apps
Step 2 Routing
via correct path
Number
info
© GSMA 2010 11
Ask the destination about a number before taking routing decisions
On detecting a destination mismatch, convert traffic format
Enable optimum conversion policy
Country 1
Break In/Out Use Case
TDM
NGN
Managed
Interconnect
Managed
Interconnect
Unmanaged
Apps
TDM
NGN
Step 1 ENUM Query
Apps
Step 2 Identify
breakout requirement Number
info
© GSMA 2010 12
PathFinder is GSMA’s global Carrier
ENUM number registry
Acts as the GSMA Carrier ENUM root
directory
Facility where operators can host ENUM
data
Provides number portability information
Operational with more than 60 users and
14 certified vendors
Open to Fixed and Mobile operators
Service operated by our partner NeuStar
Adrian Dodd, Senior Director, GSMA,
+447920237293, [email protected]
Tim Ward, Business Development, NeuStar,
+447795840016 [email protected]
Information
www.gsmworld.com/pathfinder
FNONGNs
ASPsMVNOs
MNONGNs ISPs
© GSMA 2010 13
GSMA PathFinder
ENUM Hosting: allows operators to populate and publish routing
data to specific trading partners
Tier 0, Tier 1 and Tier 2 functionality
Operator
PathFinder
Operator
Carrier
OK
X
OK
Operator
ENUM Data
Access controls
Versatile number look up registry
Tier 0
Tier 1
Tier 2 Provisioning
© GSMA 2010 14
Deployed at GRX/IPX Peering points
Solve look up latency challenge
ENUM data stored in multiple nodes globally distributed
Provides low latency local query access for interconnect partners
MNOs are already connected
Service
Providers
Service
Providers
Service
Providers
Data
owner
GRX/IPX
© GSMA 2010 15
Interoperability
GSMA ENUM Certification programme
– Vendors test against PathFinder
– Certification given to vendors
Objective interoperability
Operators gain confidence in the
interoperability of ENUM
Partner Programme– http://www.gsmworld.com/our-work/programmes-and-
initiatives/pathfinder/vendor-partners.htm
Accelerate and broaden Carrier ENUM compatible vendors
Vendor
Network
Equipment
Query
Interface
Certification
ENUM
Provisioning
CertificationVendor
OSS/BSS
Equipment
Certified PathFinder Partners
© GSMA 2010 16
IMS NNI IOT Testing
GSMA support ETSI IMS IOT testing and other trials
Tier 0, Tier 1 and Tier 2 PathFinder test capacity available
Opportunity to prove IMS interconnect routing
– Automated interoperable routing
– Global Scalability
– Multi-service support
– Learn and refine
Trial Options
– Any SIP based service
– National/International simulations (or real scenarios)
© GSMA 2010 17
International Interconnect Architecture
Operator 2Operator 3
Optional traffic
applications
VoIP
Enterprise
IMS
NAPTR results
option
Local Registry
options
Operator 1
VoLTE
IMS
RCS
Enterprise
RCS
IMSIPX
Cloud
ENUM
SIP
Delegation pointers
option
Provisioning
IPX carriers
© GSMA 2010 18
Carrier ENUM Benefits/Applications
Visibility of NGN routing info enabling all-IP interconnect
Standardised IP based solution to NGN number portability
Manage IP-TDM conversions effectively during migration
maximising quality
Scalable automated approach
Future proof automated approach to routing for any service
NGN users obtain best quality, reliability and functionality
© GSMA 2010 19
GSMA IPX and ENUM Resources
Technical Specifications
– IR.34 – Inter-Service Provider IP Backbone Guidelines
– IR.77 – Inter-Operator IP Backbone Security Requirements
– IR.67 – DNS/ENUM Guidelines for Operators
– IR.83 – SIP-I Interworking Description
Template Agreements
– AA.80 – Agreement for IP Packet eXchange Services
– IN.20 – Guidelines for use of AA.80
Service Schedules and Service Level Agreements
– AA.81 – Packet Voice Interconnection Service Schedule to AA.80
– AA.82 – SMS Service Schedule to AA.80
– AA.83 – IP Packet eXchange Service Schedule for MMS IW
© GSMA 2010 20
Summary
FNOs
ASPsMNVOs
MNOs ISPs
Any service
Interoperable & scalable
All IP solution
Reliable routing
IPX
&
ENUM
One to many efficiency
Sustainable business models
Guaranteed Quality of Service
Security
Don’t reinvent the wheel with each Interconnect
