ENUM and its impact on the VoIP market Jay Daley.

ENUM and its impact on the VoIP market

Jay Daley

If only VoIP was like email

You control your receipt of email

• Advertise which servers receive mail

– single, global, low-cost directory - the DNS

• Specify priority order for servers

• Control what mail to accept

– Black lists, white lists, reputation scores etc

Of course, this is the Internet

• Only pay for flat rate access - no per email charge

• Choose whether to connect via ISP or implement ISP-grade infrastructure


Contrast this with VoIP

VoIP in a pre-ENUM world

• Advertise your numbers, not your servers

• You must use a CP to get connected

– Can’t just buy the connectivity to become a CP

• No way to get addresses of servers from your numbers

– This directory lookup is done by CPs for you

– Directory for this is local, private and costs money

• Control on incoming calls is via CP

– You tell them what to do for you

• Pay for rental and call charges


Company B

Hotel/ConferenceHome Office

Company A

A common scenario

VoIP server

Ext 111


Ext 222

VoIP server

Ext 123

Ext 333 Ext 444

Ext 456

Internet

CP

• Company A wants to talk VoIP to company B. It needs to know

– Does B have a VoIP server?– What protocols does it support?– What is its IP address?

• With that info:– call across the Internet– no call charges, just line rental.

• Without it:– has to call via a CP– pays call charges

• Can pre-configure server, but does not scale.

• Need one way to look this up, for all telephone numbers.

A common scenarioENUM and its impact on the VoIP market

Company B

Hotel/ConferenceHome Office

Company A

VoIP server

Ext 111

Ext 222

VoIP server

Ext 123

Ext 333

Ext 444

Ext 456

Internet

CP

Using DNS to advertise VoIP

ENUM is just a part of DNS

• Step 1: turn telephone numbers into domain names:

– Special domain names to represent numbers

– 01865 332211 >> 1.1.2.2.3.3.5.6.8.1.4.4.e164.arpa

• Step 2: advertise available services associated with those numbers

– Special DNS records describe available services

– What server, what protocol, what addressing

• These domain names and records are not meant to be directly used by people.

– You still dial the number - device does the rest


A call using ENUM

Much like email

• You dial a number, same as before

• A device on your network turns it into a domain name

• Then it looks up the VoIP servers advertised on that domain

• Finds a match for supported VoIP protocol (e.g. SIP)

• Make the calls directly to receiving server across the Internet

• Did you spot?

– No CP !

– You are in control !


Configuration 2 - SBC

Configuration 1 - no SBC

Local configurations

VoIP server

Ext 111


Ext 222

VoIP server

Ext 123

Ext 456

Internet

CP

Outgoing ENUM

Outgoing non-ENUMAll incoming

SBC

Internet

CP

Outgoing ENUM

Outgoing non-ENUMAll incoming

Who might benefit from ENUM?

Lots of businesses already have VoIP internally

• Call centres

– Like to use an 0800/0845 number? - publish your ENUM instead

• Large supply chains

– Lots of suppliers to deal with? - Mandate the use of VoIP and ENUM.

• Multiple sites

– Is provisioning each site costly and complex? - Use ENUM for each site and they can automatically find each other.


Registering your ENUM

Available from late summer 2008

• Only you can register your telephone numbers

– Part of the process is proving they are yours

– So no cyber-squatting

• Register through a registrar

– Maybe your CP might become a registrar?

• They deal with the validation agency

– The people who check the number is yours

• You must have a telephone number assigned by a CP

– Can’t get numbers direct from Ofcom for this

• Expect to pay tens of pounds per year for a range


How does ENUM fit into CP market

• Convergence of Internet, voice, CPs, ISPs, content– CPs move to Next Generation Networks– One pipe, multiple services– Triple/quadruple play - Internet, TV, voice, mobile

• Some key new developments– Last mile is the new battleground– Hosting companies (web, email etc) adding VoIP mix

• Voice has an interesting part to play– Some CPs have given up on per-minute revenue for consumers– If you can keep your number and pay much less for calls then

why move to a new supplier?– How many businesses still buy non-VoIP voice switches?– What business wants to use islands of VoIP like Skype ?


Summary

• ENUM puts you in charge of your VoIP

– People can call you for free

– You control how you get those calls

• ENUM is simple, flexible and uses trusted technology

• Makes VoIP as simple as email


Any questions?ENUM and its impact on the VoIP market

[email protected]

ENUM and its impact on the VoIP market Jay Daley.

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