Salient features of Environment protection Act 1986.pptx
Vo ip
1. Voice over
Internet Protocol
Emmanuel Robles Hernández 758457
Jesús Uriel Soto Flores 755267
Sergio Iván Benítez Valdez 749978
“VoIP is not just a service, it’s a technology.”
2. What is VoIP?
• A Voice over IP (VoIP) system
allows customers to send and
receive calls over a digital
network.
• If you are calling a regular phone
number, the signal is converted to
a regular telephone signal before
it reaches the destination. VoIP
can allow you to make a call
directly from a computer, a
special VoIP phone, or a
traditional phone connected to a
special adapter.
3. Brief History
• There are 3 fundamental technologies that are necessary
for the existence of Voice over IP.
▫ The Telephone
▫ The Internet
▫ Transmission Control Protocol / Internet Protocol
(TCP/IP)
• VoIP started in February of 1995 by a small company in
Israel called Vocaltec, Inc.
• It was the first commercial Internet phone software.
• Their product, InternetPhone, allowed one user to call
another user via their computers, a microphone and a set
of speakers.
4. Brief History
• By the end of 1998 VoIP calls had yet to total 1%
of all voice calls.
• By 2000, VoIP calls accounted for 3% and by
2003 that number had jumped up to 25%.
5. How does VoIP work?
• Analog calls are converted into packets of data. The
packets travel like any other type of data (like e-mail)
over the public internet and/or privete IP networks.
• Using VoIP, you can call landline or cell phones. You can
also call computer-to-computer (using a microphone or
headsets).
• You have to ensure the best voice quality and security
(have a private IP network) in the case that you use VoIP
as a landline telephone (you also need an analog
adapter).
6. Advantages
• VoIP calls are free from users who have the same
access or program.
• It has a lower cost than other system calling
services (localy speaking).
• Offers features and services that are not
available for traditional phones.
7. Disadvantages
• Not all VoIP connect to emergency services.
• VoIP makes it difficult to locate network users
geographically.
• Exposed to hacking (record coversations, break
into voice mailboxes, etc.)
