voip, portability, and the evolution of addressing

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© 2004 AT&T, All Rights Reserved. The world’s networking company SM VoIP, Portability, and the Evolution of Addressing LNPA & Future of Numbering Working Groups April 14, 2005 Presented by Penn Pfautz

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LNPA & Future of Numbering Working Groups

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Page 1: VoIP, Portability, and the Evolution of Addressing

© 2004 AT&T, All Rights Reserved.

The world’s networking company SM

VoIP, Portability, and the Evolution of Addressing

LNPA & Future of Numbering Working Groups

April 14, 2005Presented by Penn Pfautz

Page 2: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 2

• In a pre-LNP environment, call routing based on 6-digit (NPA-NXX) translation of destination number from LERG.

• In an LNP environment, call routing based on 6-digit (NPA-NXX) translation of a Location Routing Number (LRN).

PSTN Routing

RegionalNPAC SMS

CarrierLSMS

LNPSCP

Porting Carrier

SwitchNPA-NXX

Routing tables

DialedNumber

LRN

TelcordiaLERG™

industry broadcast

record updateCarrier OSS

NPA-NXXCLLI Assoc.

Trunk Selection

Trunkingdata

Page 3: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 3

Problem Statement & Solution Path

• As carrier networks evolve to IP how should routing (including portability) be handled?

• SIP is signaling protocol of choice; URIs which can be resolved to IP addresses are the elements of address specification

• Unification of routing functions for all numbers (including portability) should be the objective so as to minimize service provider costs

• Evolution of voice networks to IP and IP interconnection argues for an IP-based solution – e.g. some form of ENUM which was specifically designed to map E.164 numbers into URIs

• Current ATIS PTSC NI-NI document envisions ENUM as target• Supports evolution away from code-based routing and associated limitations on

numbering resource optimization

Page 4: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 4

What is ENUM?

• Provides mapping from E.164 numbers to IP resources• Defined by IETF in RFC 3761

• Telephone number as domain name

• Built on top of DNS

• Look up returns URI

• Example: +1-973-236-6797

DNS

Lookup 7.9.7.6.6.3.2.3.7.9.1.e164.arpa

sip:[email protected]: [email protected]:[email protected]:[email protected]

Page 5: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 5

The Public ENUM Infrastructure

$ORIGIN e164.arpa. 3.7.9.1 IN NS nsnanp.enum.com . 4.4 IN NS sweden_enum.com .…

$ORIGIN 3.7.9.1.e164.arpa. 7.9.7.6.6.3.2 IN NS e164.att.net .8.9.7.6.6.3.2 IN NS e164.xyz.com .…

$ORIGIN 7.9.7.6.6.3.2.3.7.9.1.e164.arpa. IN NAPTR 100 10 "u" "E2U+SIP" "!^.*$!sip:[email protected]!" .

e164.arpa

Tier 0 (Country Code Registry)

nsnanp.enum.com(3.7.9.1.e164.arpa)

Tier 1 (Telephone Number Registry)

e164.att.net

Tier 2 (Application Information)

International Implementation worked in IETF and ITU-T

National Implementation worked in CC1 ENUM LLC and ENUM Forum (US)

sweden_enum.com(4.4.e164.arpa)

Page 6: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 6

ENUM Call Flow

MSC Carrier CMMSC Carrier A

Internet

794-867-5309

9.0.3.5.7.6.8.4.9.7.1.e164.arpa

sip:[email protected]

mms:[email protected]

DNS

Page 7: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 7

Why ENUM?

• Built on fundamental IP technology – not legacy foundation• Queries for URIs will come from IP network elements• No plans exist to update existing NP architecture (e.g. TRQ1-3) to make use of

URIs

• Distributed database, not SMS download• ENUM operates at a 10-digit level obviating the need for a separate

portability correction• ENUM can support both end user and carrier provision of IP routing

info• Many VoIP providers do not directly obtain numbering resources and so, not

being code or block holders, cannot provision the NPAC or LERG• These are the carriers most likely to desire VoIP interconnection so their

exclusion significantly limits scope of solutionFCC SBCIS decision could alter this but may not given the uncertainties surrounding its

implementation (terms & costs of interconnection; qualification for the ESP exemption

• ENUM can support both carrier specific interconnection and general “Internet” interconnection

Page 8: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 8

ENUM Status

• Country Code 1 ENUM LLC planning RFP for Tier 1 Registry operator to be in service mid 2006

• Country Code 1 ENUM LLC members include AT&T, GoDaddy.com, MCI, SBC Laboratories, Sprint, Verizon, and BellSouth

• ENUM in a domain other than e164.arpa can be rapidly implemented by a group of carriers should the public ENUM effort encounter difficulties

• Some wireless carriers use private ENUM for message center identification today.

• Other private ENUM implementations also exist

Page 9: VoIP, Portability, and the Evolution of Addressing

© 2005 AT&T, All Rights Reserved. 9

Alternatives to ENUM

• As long as code-based routing remains, more efficient to tie specification of IP Point-of-Interface to CO code or switch CLLI and let LNP function normally to identify CO Code to be used in routing

• This could be done as enhancement of LERG or via other processes