ENUM and Interconnect ENUM Update VON Europe 2005

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ENUM and InterconnectENUM UpdateVON Europe 2005

• Richard Stastny, ÖFEG

The opinions expressed here may or may not be
that of my company
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Content

• The basic idea of ENUM
• The basic requirement for ENUM
• The problems with ENUM
• New Approaches
• Some Examples
• Impact on Interconnect
• ENUM in Austria

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The basic idea of ENUM (RFC3671)

• The basic idea of ENUM was
• to allow end-users
• to opt-in with their EXISTING phone-numbers on
  the PSTN
• into e164.arpa
• to provide OTHER end-users with the capability
• to look up contact URIs on the Internet the first
  user wants to link to this number
• This approach has some draw-backs

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The draw-backs of this approach

• Privacy concerns reduced the usage basically to
  VoIP, but
• most VoIP providers do not provide end-users with
  SIP URIs to be reached on the Internet without
  termination fees
• Why should an end-user pay for the benefit of
  other users?
• How to overcome Metcalfes Law?
• Nobody understands ENUM

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What is THE basic requirement for ENUM?

• A public SIP URI on the Internet
• Any IP Telephony or VOIP service not providing
  a SIP URI cannot be reached via the public
  Internet and cannot be used in ENUM
• Vonage, Skype cannot be considered as VoIP
• Vonage is POTSoIP and Skype is an NGN

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VoIP on the Internet
Internet
DNS SRV lookup fwd.pulver.com
SIP
SIP
server
server
sip19343_at_fwd.pulver.com
sip19343_at_fwd.pulver.com
session
sipaxelm_at_nic.at43.at
sipmah_at_nic.at43.at
sip18341_at_fwd.pulver.com
sip19343_at_fwd.pulver.com
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So what is ENUM adding?
ENUM DNS
IN NAPTR 3.4.3.9.1.1.1.3.9.3.0.1.8.7.8.e164.arpa.
?
... NAPTR ... "!.!sip19343_at_fwd.pulver.com!"
DNS SRV lookup fwd.pulver.com
SIP
SIP
server
server
878103931119343
sip19343_at_fwd.pulver.com
session
sipaxelm_at_nic.at43.at
sipmah_at_nic.at43.at
sip18341_at_fwd.pulver.com
sip19343_at_fwd.pulver.com
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What do you need for ENUM today?

• A virtual VoIP provider on the Internet providing
  you with a SIP URI
• A SIP Softclient, Terminal Adapter or an IP-phone
• You need to configure it properly
• If you want to use your own domain name, you need
  a DNS-hosting service providing you with the
  possibility to host SRV records.
• You need your national regulator to opt-in to
  ENUM
• Your regulator has not done this yet? - Then
  there is no-way to use ENUM with your national
  number
• You need to find a Registrar in this country
• You have to put all these pieces together by
  yourself
• Now you have to sit and wait, hoping that
  somebody will call you with an ENUM enabled
  device, or using a provider supporting ENUM
  look-ups
• BTW, is your provider from above doing ENUM
  look-ups?
• Calls from the PSTN will still terminate on your
  primary line
• Only calls from the Internet terminate on your IP
  device

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Nobody is able to do this

• except some freaks
• ? So new approaches to ENUM are needed

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You cannot sell ENUM

• Because nobody understands it
• you can only sell a service or a product a
  customer understands
• What you can sell is
• a product to an enterprise (or a freak)
• a service to residential users
• You have to bundle ENUM into a product or a
  service
• e.g. a VoIP (IP Communications) product or service

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New approaches to ENUM

• ENUM for IP-based private networks ("PBX and
  IP-Centrex) with direct-dial-in (DDI)
  (product)
• ENUM-enabled number ranges for nomadic users
  (teleworkers and road-warriors, using laptops,
  PDAs, WiSIP phones and dual-mode devices)
• mobile numbers with validation via the SIM-Card,
  to be potentially used with dual-mode devices?
  Fixed Mobile Convergence
• Geographic numbers (genuine or ported) for
  virtual VoIP providers
• residential users with terminal adapters and FXO
  ports (product for freaks)

In all these cases the calls are terminated on
the same device
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Examples

• For companies and call centers (0800)
• the company PBX can be reached from PSTN and from
  Internet
• calls to other ENUM-enabled numbers are routed
  via VoIP and the Internet
• improved functionality (IM, Video, Conferencing,
  presence, )
• better quality for native VoIP calls
• For residential users with 43 780 numbers
• same as above
• reachable via any broadband connection globally
• Possible also for residential local and mobile
  numbers

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One example ENUM for enterprises
0508113184
ENUM
4.8.1.3.1.1.8.0.5.3.4.e164.arpa
sip3184_at_kapsch.net
sip3184_at_kapsch.net
TDM PBX
IP PBX
SIP Gateway
Internet
3184
4350811
Only if not in ENUM
0508113184
PSTN/ISDN
01 9793321
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ENUM-enabled Number Range

• Format 43 780 abcdef (ghi)
• the registration of the ENUM domain IS the number
  assignment
• a cancellation of the ENUM domain will relinquish
  the number
• easy, cheap, one-step process
• end-user is in control of the ENUM entries
• decoupling of number range allocation and gateway
  operator
• any gateway may route the whole number
  range,just needs to be able to query ENUM
• any gateway may route similar number ranges
  (e.g. 87810, 42360, 260510, )
• these gateways are called generic gateways (GG)

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Example 43780 and the Generic Gateway
ENUMTier 1
ENUMRegistry
7.6.5.4.3.2.1.0.8.7.3.4.e164.arpa
VoIP ProviderRegistrar
Generic Gateway
ENUMTier 2
16241_at_fwd.pulver.com
PSTN ENUM-driven number range e.g. 43 780
Subscription
Internet
Registration
0780 203 211
Globally reachable0780 203 211
Calling Party A
Called Party B
16241_at_fwd.pulver.com
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Impact on Interconnect?

• The good message
• Interconnect on the Internet using ENUM is a no
  brainer
• In bellhead speak
• It is a global IN service
• providing global service provider portability
• Using All Call Query (ACQ)
• Providing you with the global routing information
  to the destination network a URI
• Using standardized protocols SIP and H.323, and
  ..
• Using a reliable, scalable, fast, cheap and
  available technology the DNS
• The not so good message
• there are no termination fees on the Internet
• BUT there is also a slight bonus for telcos
• for calls originating on the PSTN to ENUM enabled
  numbers you may keep the whole money

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ENUM in Austria

• The trial started in September 2002
• The commercial service started December 2004 for
• Geographic, mobile, corporate, nomadic (720) and
  free-phone (800) numbers
• On 17. May 2005 the ENUM enabled number range 780
  was added
• To subcribe, you may use any registrar providing
  this number range (see www.enum.at) e.g.
  www.my-enum.at

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ENUM Implementations
Delegations in e164.arpa as of May 10th, 2005

• 31 Netherlands
• 33 France Trial
• 353 Ireland
• 354 Iceland
• 358 Finland Trial
• 36 Hungary
• 374 Armenia
• 40 Romania
• 41 Switzerland
• 420 Czech Republic
• 421 Slovakia
• 423 Liechtenstein
• 43 Austria
• 44 UK Trial
• 46 Sweden Trial
• 47 Norway
• 48 Poland
• 49 Germany Trial

• 246 Diego Garcia
• 247 Ascension
• 290 Saint Helena
• 55 Brazil
• 61 Australia Trial
• 66 Thailand (requested)
• 65 Singapore Trial
• 82 Korea Trial
• 86 China Trial
• 88234 Global Networks
• 87810 VISIONng UPT
• 971 UAE

• 1 North America soon to come
• additional Asian countries (Japan, Taiwan) have
  trials, but not in .arpa

http//www.ripe.net/enum/request-archives/http/
/www.centr.org/kim/enum/index.html
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The End

• Thank you

Richard Stastny ÖFEG 43 664 420
4100 richard.stastny_at_oefeg.at