ENUM and Interconnect ENUM Update VON Europe 2005

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ENUM and Interconnect ENUM Update VON Europe 2005

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Title: ENUM and Interconnect ENUM Update VON Europe 2005

1
ENUM and InterconnectENUM UpdateVON Europe 2005

Richard Stastny, ÖFEG

The opinions expressed here may or may not be
that of my company
2
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

3
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

4
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

5
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

6
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
7
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
8
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

9
Nobody is able to do this

except some freaks
? So new approaches to ENUM are needed

10
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

11
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
12
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

13
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
14
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)

15
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
16
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

17
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

18
ENUM Implementations
Delegations in e164.arpa as of May 10th, 2005