seminar topic

vioce over internet protocol:-
VoIP, or Voice over Internet Protocol refers to
sending voice and fax phone calls over data
networks, particularly the Internet.
This technology offers cost savings by making
more efficient use of the existing network.
Traditionally, voice and data were carried
over separate networks optimized to suit
the differing characteristics of voice and
data traffic. With advances in technology,
it is now possible to carry voice and data over
the same networks whilst still catering for the
different characteristics required by voice and
data.Voice-over-Internet-Protocol (VOIP) is
an emerging technology that allows telephone
calls or faxes to be transported over an IP data
network. The IP network could beA local area
network in an officeA wide area network
linking the sites of a large international
organizationA corporate intranetThe internet
Any combination of the aboveThere can be
no doubt that IP is here to stay. The explosive
growth of the Internet, making IP the
predominate networking protocol globally,
presents a huge opportunity to dispense with
separate voice and data networks and use
IP technology for voice traffic as well as data.
As voice and data network technologies merge,
massive infrastructure cost savings can be
made as the need to provide separate
networks for voice and data can be
eliminated. Most traditional phone networks
use the Public Switched Telephone Network(PSTN),
this system employs circuit-switched technology
that requires a dedicated voice channel to be
assigned to each particular conversation.
Messages are sent in analog format over
this network. Today, phone networks are
on a migration path to VoIP. A VoIP system
employs a packet-switched network, where
the voice signal is digitized, compressed
and packetized. This compressed digital
message no longer requires a voice channel.
Instead, a message can be sent across the
same data lines that are used for the Intranet
or Internet and a dedicated channels is
no longer needed. The message can now
share bandwidth with other messages in
the network. Normal data traffic is carried
between PC s, servers, printers, and other
networked devices through a company s
worldwide TCP/IP network. Each device on
the network has an IP address, which is
attached to every packet for routing.
Voice-over-IP packets are no different.
Users may use appliances such as Symbol s
NetVision phone to talk to other IP phones or
desktop PC-based phones located at company
sites worldwide, provided that a voice-enabled
network is installed at the site. Installation
simply involves assigning an IP address to
each wireless handset. VOIP lets you make
toll-free long distance voice and fax calls
over existing IP data networks instead of
the public switched telephone network (PSTN).
Today business that implement their own
VOIP solution can dramatically cut long
distance costs between two or more locations.
satya prakash tiwari
b.tech (c.s.e.)