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Lance D Souza

on 6 December 2012

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Transcript of VoIP

Lance R D Souza Understanding VoIP VOIP is an acronym for Voice Over Internet Protocol, or in more common terms phone service over the Internet.

Some people use VOIP in addition to their traditional phone service, since VOIP service providers usually offer lower rates than traditional phone companies What is Voip? InformationWeek's Research study which surveyed 280 companies

Top reasons why companies want to adopt VoIP:

Lower telecommunications costs
Desire to merge voice and data networks
Ease of management Why do companies want VoIP? Save a lot of money - Unlike traditional phones, here internet is the backbone.

More than two persons - Traditional phones are a two way closed circuit connection. On VoIP an entire team can communicate in real time

Cheap user hardware and software - An internet connection, sound card and microphone is all you need. Advantages Sending side:
Signaling and media channel setup, digitization of the analog voice signal, encoding, packetization, and transmission as Internet Protocol (IP) packets over a packet-switched network.

On the receiving side, similar steps (usually in the reverse order) such as reception of the IP packets, decoding of the packets and digital-to-analog conversion reproduce the original voice stream. Important Stuff Quality of Service (dependent on the internet)


Susceptibility to power failure

Emergency calls

PSTN (Public Switched Telephone Network) integration Disadvantages Unuth, N. (n.d.). Why Do Companies Want VoIP?. Your Complete Guide to VoIP - Voice Over IP - Internet Telephony. Retrieved July 16, 2012, from http://voip.about.com/od/markettrends/a/WhyAdoptVoIP.htm References Voice over IP has been implemented in various ways using both proprietary and open protocols and standards.

The H.323 protocol was one of the first VoIP protocols that found widespread implementation for long-distance traffic, as well as local area network services.

Session Initiation Protocol (SIP) has gained widespread VoIP market penetration. Protocols VoIP telephone systems are susceptible to attacks as are any Internet-connected devices.

While firewalls and Network Address Translators can help they also make external communication more difficult.

Many consumer VoIP solutions do not support encryption, as a result, it is relatively easy to eavesdrop on VoIP calls. Security
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