Transcript CpIP Voive

The Business
Implications Of
Internet
Telephony
Evolution of
IP Telephony.
Evolution of IP
Telephony
• IP Telephony - the technology that
enables telephony applications to
run on existing data networks via
the Internet Protocol.
• This causes a revolutionary
change in the
telecommunications industry.
Evolution of IP Telephony
• The IP Telephony has evolved as a result of
the convergence of the circuit-switched
networks (analogue PSTN) and the LAN
based packet-switched networks coupled
with other data communication technologies.
ITSP
PSTN
INTERNET
ITSP
PSTN
Evolution of IP
Telephony
• By taking advantage of data
commu-nications technologies,
IP Telephony not only improves
performance but also reduces
costs.
Evolution of IP
Telephony
• From
traditional
telco
infrastructure
to
advanced
applications in call centers, IP
telephony enhances existing
methods of communication and
creates
new
markets,
opportunities and revenues.
Market
growth
factors.
Total Internet Telephony Market :
Revenue Forecast (World),
1995-2001
2
R e v e n u e s ($ B illio n )
1 .8
1 .6
1 .4
1 .2
1
0 .8
0 .6
0 .4
0 .2
0
1995
1996
1997
1998
1999
2000
2001
Year
Frost & Sullivan- study, 1997
Market growth factors
• Long distance telephone calls and
facsimile
transmissions
at
significantly reduced charges.
• New and enhanced applications
using IP-based telephony.
The combinations of
the Net-based
telephony services
•
•
•
•
•
PC-to-PC
PC-to-Phone
Phone-to-Phone
PC-to-Fax
Fax-to-Fax
Enabling New
Applications
•
•
•
•
•
•
Voice and Fax Toll By-pass
Unified Messaging
Web-enabled Call Centers
LAN Telephony
Remote Teleworkers
Internet Call Waiting
POTENTIAL ITSP
The primary potential service provider of
IP telephony includes the following :




Long Distance Carriers such as telcos.
Internet Service Providers.
Private Network Service Providers.
Corporate Private Networks.
Basic Design
Criteria In The
Development
Of Internet
Telephony
Basic Design Criteria
In The Development
Of Internet Telephony
•
•
•
•
How the technology works
How it is used
Standards implementation
To achieve and maintain good
voice quality
How The
Technology
Works.
How The Technology
Works
• Approximately 6 simultaneous
compressed internet telephone
calls can be transported by a
64Kbps bandwidth (pipe) in
comparison to a standard normal
telephone call which requires a
64Kbps bandwidth.
How The Technology Works
IP Telephony gateway
IP Packet
DSP
Memory
CPU
2
3
4
NIC
INTERNET
5
1
1 Pick up the handset and dial the
required telephone number.
6
How The Technology Works
IP Telephony gateway
IP Packet
1
DSP
Memory
CPU
2
3
4
NIC
INTERNET
5
6
2 The voice card picks up the call and
converts the voice input into ‘0’ and ‘1’ as
data bits. The on-board hardware (DSP)
runs an algorithm which samples the data to
perform compression, noise & echo
cancellation, silence supression, etc.
How The Technology Works
IP Telephony gateway
IP Packet
DSP
2
1
Memory
3
CPU
4
NIC
INTERNET
5
6
3 The information is stored in the RAM
until the current processor cycle is
completed.
How The Technology Works
IP Telephony gateway
IP Packet
1
DSP
Memory
2
3
CPU
NIC
4
5
INTERNET
6
4 The processor reads the data from the
RAM and sends the encoded IP data
packets to the NIC card.
How The Technology Works
IP Telephony gateway
IP Packet
1
DSP
Memory
CPU
2
3
4
NIC
INTERNET
5
6
5 The NIC card receives the encoded IP
data packet and sends it out to the IP
Network.
How The Technology Works
IP Telephony gateway
IP Packet
1
DSP
Memory
CPU
2
3
4
NIC
5
INTERNET
6
6 The data is transmitted across the
network and is received on the other end
by a gateway. This gateway proceeds to
do the reverse to convert the data to
voice.
How The Technology Works
Network
Provider
PSTN
IP packets
Analog
signal
IP
Telephony
Gateway
PSTN
IP packets
IP
Telephony
Gateway
Analog
signal
Summary:
The IP Telephony Gateway converts the voice and fax signals from the
telephone system into digitised and compressed data packets. The data
packets are encapsulated into IP packets and sent over the IP networks.
The IP packets then route over the network provider to the destination
where the reverse process takes place.
How it is
used.
How it is used.
VoIP Over Private Data Network
IP Router
Internet or
private IP
backbone
CpIP
Voice
Gateway
IP Router
CpIP
Voice
Gateway
Public Switched
Telephone
Network PSTN
How it is used.
INTERNET TELEPHONY SERVICE PROVIDER
IP Router
IP Router
INTERNET
CpIP Voice
Gateway
CpIP Voice
Gateway
Point of
Presence
Point of
Presence
LOCAL
LOCAL
PSTN
PSTN
Internet Phone/Fax Subscribers
How it is used.
INTERNET TELEPHONY APPLIANCES
LOCAL
Business
LOCAL
PSTN
PSTN
VoiceMail
and other
services
Internet
gateway
VoIP
gateway
VoIP
gateway
Internet
gateway
Private IP
POP
backbone
Internet
Residential
gateway
Internet
Cable modem
VoIP
gateway
Cable
Cable
Plant
headend
Call Control
server and
billing
gateway
CLEC Central Office
Standards
Implementation.
Importance Of
Standards
In order for internet telephony to be OPEN and
not proprietary, the voice over IP forum has
agreed to adopt the two significant
International
Telecommunication
Union
standards.

G.723.1 for voice compression to 6.3Kbps
G.723 operates at very low bit rates and will
be the predominant audio codec in H.323
applications.
Importance Of
Standards


H.323 standard provides a foundation for
audio, video and data communications
across IP based networks including internet.
H.323 will be the keystone for LAN based
products
for
consumer,
business,
entertainment and professional applications.
Products that conform to these standards
should be able to interoperate with each
other.
To achieve
and maintain
good voice
quality.
Good Voice Quality
Over Internet
This is a fundamental issue of
Internet Telephony.
Toll quality is defined as the
acceptable voice quality over a period
of time. It is necessary and important
to be able to sustain this toll quality
throughout the conversation.
Good Voice Quality
Over Internet
However there are 2 other inherent
undetermined factors of the Internet
that will affect the voice quality.

Delay in network

Data
packet
loss
due
to
insufficient bandwidth , resulting
in breaks in the conversation
Future Performance
Improvement In
Internet Telephony
Besides having better compression
algorithm, there is another area of
development which will improve the
performance
of
the
Internet
Telephony.
Future Performance
Improvement In
Internet Telephony
The new IP ver.6 will support standard
Resource Reservation Protocol (RSVP).
With the implementation of RSVP, a user
can request for a specific amount of
bandwidth for a particular data stream
and receive a reply indicating whether the
request has been granted.
Thank You
PRESENTED BY :
Mr. MC Yong
Managing Director
Computer Protocol Malaysia
34, Jalan Berangan, 50200 Kuala Lumpur
http://www.cpm.com.my
[email protected]
Tel : 603 241 5232
Fax : 603 241 8832