Internet Telephony: Technology Standards & Business

greydullNetworking and Communications

Oct 30, 2013 (4 years and 2 months ago)

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Politecnico

di Milano

Slide
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Internet Telephony:

Technology Standards & Business

Maurizio Dècina

Politecnico di Milano



Convegno CNIPA

Tecnologie Voice over IP come opportunità per la PA


Roma, March 17, 2005

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Open Networking Architecture

Networked Applications

Email, Fax, Telephony,


, Videoconferencing, Television,…

E
-
games, Web Browsing,


Videostreaming,…

Interactive Education, Interactive Television, Financial Services,…

Interoperability (Middleware)

Name Servers, Security, Privacy, Directories, Electronic Money,...

Distributed Computing,


Transportable Programs & Intelligent Agents

Internetworking

TCP/UDP end
-
to
-
end transport

IP DiffServ & IntServ Flows

Interconnection

Telecom Services: POTS, ISDN, ATM, Wireless,…

Television Services: CATV, Digital Video Broadcasting, DTT, …

Data Pipes:

Modem: POTS, ISDN, DSL, Cable,…

Data: LAN, X.25, Frame Relay,…

Leased Line: T1/E1, T3/E3, SONET/SDH,…

M. DECINA: "Internet e l’infrastruttura globale dell’informazione" (Internet and the Global Information
Infrastructure),
Notiziario Tecnico Telecom Italia
, vol. 6, n. 2, Ottobre 1997.

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Voice over IP Packets

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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3 Faces of Convergence

Convergence

Communications

Convergence

Broadcast to Unicast

Convergence

Fixed to Mobile

Convergence


Source: M. Dècina, 2004

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Full IP Network

Internet

PSTN/ISDN

IP Backbone

Network Environment

Service Environment

Internet

Application

Platforms

Internet

Application Servers

Media

Gateway

Mobility, Location,
Connection & Control
Servers

Mobility

Gateway

Intelligent Edge

Broadband

Gateway

BTS


AP

Wired
Access

RSU

RSU

Wireless
Access

Wi
-
Fi/WiMAX+

2G/3G+

xDSL+

FTTx

LRE

Source: M.Dècina, 1999, updated 2003

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Broadband Access: the Bandwidth Gap

WAN

Metro

Core

Metro

Edge

Bandwidth

10/100/1000

10G/40G

E1 Lines

LAN

ADSL

ADSL2

ADSL2+

FTTx

WiEth

2
-
4 Mb/s

4
-
8 Mb/s

25 Mb/s

x000 Mb/s

X00 Mb/s

Existing

Copper

Fiber

Wireless

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Residential Broadband Access

DSLAM

Incumbent

ULL site

TRIPLE PLAY SERVICES over DSL



Telephony Services


Internet Access (up to 20 Mbit/s)


Live TV, VoD, and Video Streaming


Videocommunication

IAD

Wi
-
Fi

Access

Point

STB

IAD

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Windows Media Center

One device for home personal management of multimedia entertainment and
information appliances

User


friendly interface for the entire family

Remote Control















Input:

DVB
-
T

Cable


SAT

Analog TV

Internet (VoD


Napster, ESPN, Sonic, etc.)

Feature

Video: MPEG
-
2, dvr
-
ms, XVID & DIVX v3/v5

Audio Format: Wav, MP3, WMA

Web browsing: Internet Explorer 6

Shared Internet Access

http://www.microsoft.com/windowsxp/mediacenter

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Evolving Wireless Communications

Source: M. Dècina, 2004

MobileFi

802.20


UMTS

10 kbit/s

100 kbit/s

1 Mbit/s

10 Mbit/s

100 Mbit/s

UltraWideBand

802.15.3

Bluetooth

802.15.1

1 Gbit/s

ZigBee

802.15.4

EDGE

GPRS

GSM

1 kbit/s

CABLE

REPLACEMENT

HOME, OFFICE


PUBLIC ACCESS

CITY,

SUBURBS

COUNTRY,

REGION

WIDE

Range

Bit Rate

ED

HSDPA

PAN

WLAN

WMAN

WAN

Wi
-
Fi

802.11b

802.11a/g/n

WiMAX

802.16a/e

LIMITED

FULL

Mobility

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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MobileFi, aka 802.20, vs. 3G

Source: Guy Pujolle, 2003

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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3 Faces of Internet Telephony

Internet

Telephony

Internet Phones

ASP VoIP

Carrier Phones

NGN VoIP


Wireless Phones

Wi
-
Fi VoIP

Source: M. Dècina, 2004

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Telephony/Internet Transition

2002
-
2012

SIP

SS
-
7

packets

circuits

SIGNALLING

MEDIA

GATEWAYS

@ Mid Transition

2007

2 Billion+

Wired & Wireless

Telephone Users

2 Billion+

Wired & Wireless

Internet Users

SOFT

SWITCH

Next Generation

Internet

IP v6

POTS, ISDN,

GSM, UMTS,..

POTS, ISDN, DSL, FFTx,…

UMTS,.WiFi,.WiMAX..

Source: M. Dècina, 2002

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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NGN Voice
-

Architectural Transition





POTS, PABX:
generates user
signalling, tx and rx
user voice data


User equipment

Interworking functions


SGW: converts IP signalling
to PSTN/ISDN signalling


TGW: converts IP data flow
to PCM


SBC: interconnects two VoIP
network via IP


TDM switch: Call controll &
Call routing towards the
PSTN/PLMN network


AGW: encapsulates user’s
signalling on IP and converts
PCM to IP data flow


SGW: converts IP signalling to
PSTN/ISDN signalling


TGW: converts IP data flow to
PCM


Class 5 Replacement,
offloading functions

Class 4 Replacement
functions

IN & Multimedia
service platform
functions


SOFTSWITCH: controls call
routing & call set
-
up for CL 4/5
replacement


DIRECTORIES: advanced routing
information

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Skype p2p Internet Telephony

170 Countries



29 m users, 85 m dowloads



Proprietary SW, POTS quality, strong privacy



Free PC
-
to
-
PC calls



1 m users of “SkypeOut”: PC
-
to
-
Phone

March 2005

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Web Telephony Features

PC Telephony

Public PC Telephony

Multiparty conference

Address book, Finder

Centralized Directory

Click2Dial

Mail
-
to
-
Speak

Integration with Microsoft Outlook

Presence

Instant Messaging

Chatting, SMS, MMS and EMS

Videomessaging

Videocommunication

Nomadic access (safe individual connection from Everywhere)

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Microsoft Live Communications Server

Microsoft Passport Digital Identity
, Microsoft Active Directory,
Microsoft
Windows Media Center, …

Microsoft Live Communications Server

Uses SIP based Telephony, as part of the Instant Messaging Service, and
includes

telephony capabilities, IM, notification, conferencing, messaging and
presence functionality

a desktop “dashboard” to provides access to functions and administration

methods of integrating directly with business applications, and a range of
mobility capabilities

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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SIP Entities


Multimedia over the Internet

User Agent Client (UAC)

End systems

Send SIP requests

User Agent Server (UAS)

Listens for call requests

Prompts user or executes program to
determine response

User Agent

UAC + UAS

Redirect Server

“Network” server; redirects users to try
other server

Proxy Server

“Network Server” Proxies request to
another server Can “fork” request to
multiple servers, creating a search tree

Registrar

receives registrations regarding current
user locations


Request

Response

Media

1

2

3

4

5

6

7

8

9

10

11

12

SIP Client

SIP Redirect

Server

SIP Proxy

SIP Proxy

SIP Client

(User Agent Server)

Location Service

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SIP Proxy

Source: H.Schulzrinne, 1999

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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SIP
-

Beyond Voice

ENUM

query

SIP
-
1

SIP
-
2

Internet

Gateway

DNS

PSTN

Switch

PSTN

Phone number to reach any
device on IP or PSTN

Presence, phone number or URL to reach
any device on IP or PSTN

IP communications are integrated
with applications

AOR to
Contact
Address

Internet

TDM

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Converged Network Solutions

Mobile
Working

SIP SERVER

Survivable

Remote

Gateway

Survivable

Remote

Gateway

Main site

Remote site 1

Remote site 2

Converged

Voice Specialty

WiFiIP, TDM, analog

WAN

PSTN

Multi
-
Media

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Converged Services & Devices


IP

Network

Service Content

Mobile

Fixed

Broadcast

Personal

Digital

Environment

User

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Sistema Pubblico di Connettività
-

SPC

Fonte: CNIPA, 2003

Asp 1


Asp 2


Cittadini e imprese

MILANO

T
O
RI
N
O

GENOVA

ANCONA

L’AQUILA

CAMPOBASSO

BARI

CATANZARO

PALERMO

CAGLIARI

NAPOLI

TRIESTE

Internet

Provider 1

Provider 2

Provider 3



Provider 1

IP BE 2Mbps x


IP BE 100 Mbps
y


….

Provider 2

IP HQ 2Mbps k


IP HQ 100 Mbps
z


LISTINO
SERVIZI

Asp
3


PAC

RUPAR

PAL

PAC

RUPAR

PAL

PAC

RUPAR

PAL

Struttura di gestione

della qualità

ISP Nazionale

ISP Regionale

ISP Locale

Internet qualificata

T

3

VENEZIA

BOLOGNA

PERUGIA

FIRENZE

ROMA

Struttura di gestione

della sicurezza


PROVIDER
QUALIFICATI

©
2005 Maurizio Dècina

CNIPA VoIP, Rome, March 17, 2005

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Rete Internazionale delle PA
-

RIPA

Fonte: CNIPA, 2004