VoIP is one of a family of internet technologies and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks. FB: https://www.facebook.com/mstfahsin

1. VoIP
Mostafa Hussien

2. W will talk about:
e
• Telephone.
• Internet Protocol.
• Voice over Internet Protocol.
1. Its uses.
2. Its benefits.
3. Challenges.

3. Agenda

4. Telephone

5. • Telephone is a telecommunications device
that transmits and receives sound.
• It converts the sound waves to electrical signals, which
are sent through the transferring medium to the other
phone, where they are converted back to sound waves.
• Telephones are a duplex communications medium,
meaning they allow the people on both ends to talk
simultaneously.

6. Internet Protocol

7. • Protocol is how some thing is done in given steps.
• Internet Protocol is how data is transmitted through the
internet.
• Each computer has it’s own IP address so data is sent
directly to it’s address.
• Packets is how data is transferred through the internet.
• Each part is sent through the internet as one packet.
• Packet is a data with some other headers like source IP
address , destination IP address & packet size.

8. VoIP

9. • Is one of a family of internet technologies and
transmission technologies for delivery of voice
communications and multimedia sessions over Internet
Protocol (IP) networks.
• Is a technology that allows you to make voice calls
using an Internet connection instead of a regular
phone line.
• VoIP is the technology in which the analogue voice
signal is digitized and becomes binary numbers in order
to be transferred by the IP protocol.

10. VoIP can be
implemented in several
ways:

11. 1. Dedicated VoIP phones connect directly to
the IP network using technologies such as
wired Ethernet or wireless Wi-Fi..

12. 2. An analog telephone adapter is a device
used to connect one or more standard analog
telephones to a digital telephone system.

13. • A softphone (Skype) is application software
installed on a networked computer that is
equipped with a microphone and speaker.

14. Why we use
VoIP?!

15. • Because of the bandwidth efficiency and low costs
that VoIP technology can provide.
• VoIP allows both voice and data communications to
be run over a single network, which can significantly
reduce infrastructure costs.
• VoIP devices have simple user interfaces, so users
can often make simple system configuration changes.

16. Benefits of VoIP

17. 1. Operational Cost
• VoIP can be a benefit for reducing
communication and infrastructure costs.
Examples include:
• Routing phone calls over existing data networks to avoid the
need for separate voice and data networks.
• Conference calling, IVR, call forwarding, automatic redial,
and caller ID features that traditional telecommunication
companies normally charge extra for, are available free of
charge in VoIP.

18. 2. Flexibility
• The ability to transmit more than one telephone call over
a single broadband connection.
• Location independence. Only a sufficiently fast and stable
Internet connection is needed to get a connection from
anywhere to a VoIP provider.
• Integration with other services available over the Internet,
including video conversation, message or data file
exchange during the conversation.

19. Challenges of
V oIP

20. 1.Quality of service
• It does not provide a network-based
mechanism to ensure that data packets are not
lost, or delivered in sequential order.
• A VoIP packet usually has to wait for the
current packet to finish transmission, although
it is possible to abort a less important packet in
mid-transmission.

21. 2. Power Failure
• Telephones for traditional analog service are usually
connected directly to telephone company which
provide direct current to power independently of
locally available power.
• IP Phones and VoIP telephone adapters connect
to routers or cable modems which typically depend
on the availability of mains electricity or locally
generated power.

22. 3. Emergency calls
• The nature of IP makes it difficult to locate network
users geographically.
• Emergency calls, therefore, cannot easily be routed to
a nearby call center.
• Sometimes, VoIP systems may route emergency calls
to a non-emergency phone line at the intended
department.

23. 4. Security
• VoIP telephone systems are susceptible to attacks as are any
internet-connected devices. This means that hackers who
know about these vulnerabilities can institute attacks, harvest
customer data, record conversations.
• To prevent the above security concerns government and
military organizations are using Voice over Secure IP
(VoSIP), Secure Voice over IP (SVoIP), and Secure Voice
over Secure IP (SVoSIP) to protect confidential and
classified VoIP communications.