20050922 number portabilityenumsip-von-boston

AG Projects VON Boston - Fall 2005

Number portabilityUsing ENUM and SIP

Adrian GeorgescuAG Projectshttp://ag-projects.com


Voice paradigm shift

The past:

• One socket in the wall• One phone device• One service provider

Telephone number is “wired” to the socket in the wall. The service, device and address are hardwired to each other by the incumbent telco.


Voice paradigm shift

Today:

• Network access - WiFi in the hotel• SIP device - my Hitachi WIP500 phone• PSTN service - my provider is in the

Netherlands• Identity - my address is sip:ag@ag-

projects.com

Identity is the only common feature, all items are connected together only at logical level.


What changes over time?

Each of them may change:

• I wish I have the latest and most advanced phone

• I wish I get the cheapest and fast Internet access

• I wish I call at the cheapest rates to the PSTN• I may wish to work abroad, change location

I do not want however to change my address every time!


Number portability today

If you can change your service provider and preserve your telephone number, you benefit of number portability

• Porting numbers between mobile operators • Porting numbers between fixed line operators• Porting numbers from mobile to fixed

operators• Porting numbers across borders (geographical)

Current telephone number portability works with limited success and dependent on regulatory in each country


Number portability on IP

How can I be reached to my identity if I change either the access, the device or the service?

• SIP maps Internet location of phones with SIP addresses

• ENUM maps E.164 telephone numbers to SIP addresses

The combination of SIP with ENUM provides an ideal number portability solution because they combine the logic of uniting the identity with the access, the device and the service


SIP redirect service

• SIP as a location service supports redirection using 30X response codes (Moved temporary/permanently)

• A SIP redirect service redirects all calls unconditional to another SIP address (final destination)

• My SIP address sip:[email protected] is merely an alias, it points to my sip address:[email protected]

SIP redirect works similar with email forwarding, it can be independent of the SIP provider providing the destination SIP address


ENUM mappings

ENUM is the “missing” link between PSTN and Internet

• ENUM is an address translation database that maps E.164 numbers into IP addressing schemes (any)

• My ENUM number +31208005169 points to my SIP address sip:[email protected]

The ENUM mappings are records hosted in the DNS like any other domain name. The domain hosting can be independent of the PSTN service provider.


All together now!

The recipe for Internet number portability is:

• ENUM domain hosting• Internet domain registration• SIP Redirect service

• Open-garden SIP service provider• ENUM enabled PSTN operator• User-ENUM ready national registry (opt in)


[email protected] [email protected]

What the user must do

?


[email protected] [email protected]

[email protected]

+1-123-456789

What the user must do

mailto:[email protected]


On stop shop API

Send one SOAP/XML request to the Tier1 registry:

• registerAccount(domain=lastName.com,number=ENUM)

The SOAP request is decomposed into:– Domain registration– DNS zone creation– ENUM NAPTR record creation– SIP alias creation– Recurrent payment


Fiction or reality?

Internet number portability is already in production status:

• ENUM.at (Austria)

• EUROVOICE.ro (Romania)


This presentation is available at http://ag-projects.com/ENUM/

Thank you,Adrian Georgescu Sip/Email:[email protected]

20050922 number portabilityenumsip-von-boston

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