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Infrastructure ENUM David Seaton Director Product Marketing Ericsson
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Infrastructure ENUM
David SeatonDirector Product Marketing
Ericsson
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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
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There are may variations on ENUM!
User ENUM Private ENUM
– Operator ENUM– Enterprise ENUM– Carrier ENUM
Federation ENUM Infrastructure ENUM
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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.
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Infrastructure ENUM vs Public ENUMInfrastructure ENUM Public ENUM
Who decides to participate in the ENUM scheme?
Service Provider Country (Administration)
ENUM subscribers
By whom is information required? Service Provider only Optional information
By whom is information supplied? Service Provider ENUM 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 controlled Yes No
Is a domain defined No Yes: e164.arpa
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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:[email protected]
• query the ENUM (for NAPTR)
mailto:[email protected]
IN NAPTR 100 100 "u" “E2U+sip“ !^.*$!SIP:[email protected]! .
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sip:[email protected] sip:[email protected] sip:[email protected] sip:[email protected]
session
DNS SRV lookupcarrierb.uk
SIP Session Establishment
DNS
IMS IMS
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E.164 Session Establishment
SIP server
tel:+442476562000
session
DNS SRV lookupcarrierb.uk
DNS
0.0.0.0.2.6.5.6.7.4.2.4.4.e164.arpa.
... NAPTR ... "!^.*$!sip:[email protected]!"
ENUM
sip:[email protected] sip:[email protected] sip:[email protected] sip:[email protected]
IMS IMS
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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
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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
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ENUM
JoyDavid
Jane Fred
Operator A Operator B
‘standard’ ENUM
IMS
AGW
AGW AGW
AGW
Dialled Number
POI A
POI A
POI B
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ENUM
JoyDavid
Jane Fred
Operator A Operator B
‘standard’ ENUM
IMS
AGW
AGW AGW
AGW
Dialled Number
POI A
POI A
POI B
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ENUM
JoyDavid
Jane Fred
Operator A Operator B
‘enhanced’ ENUM
IMS
AGW
AGW AGW
AGW
POI A
POI A
POI B
Dialled Number & Originating Line Identity
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ENUM
JoyDavid
Jane Fred
Operator A Operator B
‘enhanced’ ENUM
IMS
AGW
AGW AGW
AGW
POI B
POI A
POI B
Dialled Number & Originating Line Identity
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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
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Thank You
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