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How Does IP Work? June 8, 2004 David Young Internet & Technology Policy Development Types of VoIP Calls IP to IP Includes PC-to-PC and Device-to-Device IP Phone Broadband POTS PSTN POTS Internet PSTN Analog Phone Analog Phone VoIP Gateway VoIP Gateway POTS Broadband IP Phone

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how does ip work

How Does IP Work?

June 8, 2004David Young

Internet & Technology Policy Development

slide2

Types of VoIP Calls

IPto

IP

Includes PC-to-PC and Device-to-Device

IPPhone

Broadband

POTS

PSTN

POTS

Internet

PSTN

AnalogPhone

AnalogPhone

VoIPGateway

VoIPGateway

POTS

Broadband

IPPhone

AnalogPhone

CPEGateway

AnalogPhone

Circuit Switched / TDM

Packet Switched Data

Circuit Switched / TDM

slide3

Types of VoIP Calls

Phone to IP &

IP to Phone

Includes PC-to-Phoneand Device-to-Phone

IPPhone

Broadband

POTS

PSTN

POTS

Internet

PSTN

AnalogPhone

AnalogPhone

VoIPGateway

VoIPGateway

POTS

Broadband

IPPhone

AnalogPhone

CPEGateway

AnalogPhone

Circuit Switched / TDM

Packet Switched Data

Circuit Switched / TDM

slide4

Types of VoIP Calls

Phoneto

Phone

IPPhone

Broadband

POTS

PSTN

POTS

Internet

PSTN

AnalogPhone

AnalogPhone

VoIPGateway

VoIPGateway

POTS

Broadband

IPPhone

AnalogPhone

CPEGateway

AnalogPhone

Circuit Switched / TDM

Packet Switched Data

Circuit Switched / TDM

voip history

Breakthrough!

    • (Higher fidelity voice, multimedia communications, 3G wireless integration, presence & availability, etc.)
  • Local Service Alternative
    • (Vonage, Packet8, CableTV, GoBeam)
  • Domestic Long Distance Bypass
    • (Dialpad, Net2Phone, MSN, AIM, Yahoo)

International Bypass

Hobbyist Toy

1995

1997

1999

2003

200x

VoIP History

(“The Innovator’s Dilemma”, Clayton Christensen 1997)

Sustaining Technology

Disruptive Technology

modes of broadband delivery
Modes of Broadband Delivery

DSL

CableModem

Fiber

PowerLine

“Land Line”

FixedWireless

Satellite

3GCellular

WirelessLAN

“Wireless”

voip over broadband
VoIP over Broadband
  • Scalable technology minimizes up front investment for new entrants
    • Invest in softswitch & OSS
    • Customer may pay for adapter
    • Option to outsourcemedia gateways

Virtual Phone Company

http://www.cisco.com/warp/public/cc/pd/as/180/186/prodlit/at186_ds.htm

many voip providers can compete over a customer s broadband connection
Many VoIP Providers Can Compete Over a Customer’s Broadband Connection

Assign or port number

Emulate dialtone

Provide full feature set +

Co-locate with CLEC partner for termination

Plug into broadband router (e.g.) with inexpensive adapter

Traverse customer’s broadband connection

voip is already delivering calls between pcs and ip phones

Where is Bob@AOL.com?

2

Call Bob@AOL.com

1

3

Bob@AOL.com is at 129.23.10.2

Bob@AOL.com

Is at 129.23.10.2

4

5

VoIP is already delivering calls between PCs and IP Phones:

IP Phone to PC Voice Call (IP to IP)

SIP

Proxy

Server

Directory

Server

IP Network

Hello!

Bob@AOL.com

129.23.10.2

Sally@Verizon.net

150.34.23.7

voip callers can also interconnect with the pstn

Sally

Calling Clare

Where is Clare?

Set up call to Clare

From Media Gateway

4

2

5

7

6

3

Use Media Gateway

to call Clare

Contact MGC at 175.1.1.1

7

Sally

Calling Clare

6

8

1

8

8

VoIP Callers can also interconnect with the PSTN:

SIP

Proxy

Server

Media

Gateway Controller

(175.1.1.1)

Directory

Server

Signaling

Gateway

SS7

PSTN

Media

Gateway

(175.1.3.5)

EO

Verizon.net

IP Phone to PSTN Phone (IP to Phone)

Hello!

Sally

150.34.23.7

Clare

voip gives control to the end user

LA

NY

5th Flr

12th Flr

VoIP gives control to the end user:

Moves, Adds & Changes

Call Manager

Sally : 181.8.3.4

Call Manager

Sally : 181.8.3.4

Sally : 150.34.23.7

Media

Gateway Controller

Application

Server

Signaling

Gateway

IP Network

PSTN

Sally logs into the

Call Manager server

which updates her profile with the

new IP address

Media

Gateway

2

Sally changes office

1

181.8.3.4

Sally

181.8.3.4

Sally

150.34.23.7

150.34.23.7

User B

technology differences create policy problems
Traditional Telephone

Location

Customers locations were known

Service providers had physical presence in town/state/country

Mobility

Customer’s locations were fixed and did not change

One Service

Network operator provided voice service

Voice was the primary service

Voice calls could easily be identified, tracked, measured & monitored

VoIP

Location

Service providers and end users can be located anywhere

Service providers do not need to know where their customers are physically located

Mobility

Customers can use their service from any broadband connection anywhere – home, office, hotel, Starbucks, etc…

Convergence

Broadband provider may be unaware of voice service

Voice is one of many services riding over the same broadband connection

Voice packets are indistinguishable from the rest (web, email, instant messaging, etc.)

Technology Differences Create Policy Problems
broadband continues to grow rapidly enabling robust application growth
Broadband Continues to Grow Rapidly Enabling Robust Application Growth

Source: Smith Barney, “Cable MSOs Leaving A Lot of Food on the Table”, April 28, 2004

convergence has made old distinctions between services meaningless

VoIP Services

Cable TV Networks

Convergence has made old distinctions between services meaningless

Music/MediaTV & Radio

Content & Applications

Wireless Voice /SMS Services

Internet Service

Wireline Voice Services

Network Access& Connectivity

Telco Local Loop

Satellite

End User

Layer

POTS Phone

Television& Set Top Box

Computers& OperatingSystems

PDAs

IP Phone

Cell Phones