Made by: Yuzhao Li
Student ID:u3035801
 How many of you are using Skype,
or have ever used Skype?
 Do you know what the VoIP is?
 Voice over Internet Protocol
 A general term for a family of methodologies,
communication protocols, and transmission
t...
 People’s voice or
other sounds record
by the computer as
samples
 Then the samples
are send as packets
over IP network ...
 Different from traditional Public Switched
Telephony Network, VoIP has several advantages
 Cost saving
 Flexibility
 ...
 A software application
that provides
telephone service using
VoIP technology
facilitating voice
communication over the
i...
 Founded in 2003 by the Swedish entrepreneur Niklas
Zennstro, and a Dane Janus Friis
 In October 2005, eBay purchased Sk...
0
10
20
30
40
50
2005
2006
2007
2008
2009
active user (in millions)
active
user (in
millions)
Skype
13%
MSN
11%
some
other...
 Skype offers a number of features to its users,
such as:
a) Rate control mechanism
b) Voice codec
c) Error-resilience mechanism
d) Better relaying mechanism
to go through NAT serv...
 Can find and locate users
 Highly scalable
 Strong NAT/ firewall traversal capability
 Security feature
 Integrated ...
 Quality of service
 Susceptibility to power failure
 Still difficult to make a emergency calls
 Lack of redundancy
 ...
 MSN sends smaller packets with higher sending rate
than Skype
 MSN has higher variance in packet’s inter-arrival time
w...
 Clarity
 Reliable
 Can call any phone, local or
international, not just
computers
 Quality of voice
 Have many diffe...
 Skype have a lot of impacts on its users, and also
may influenced people’s daily life.
 For example, its impact on teac...
 Weicheng Xiao. (2006). A performance Study of
VoIP Applications: Skype vs. MSN. National
Taiwan University
 Lani Rexius...
Ctc final presentation skype t5_yuzhao li (u3035801)
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Ctc final presentation skype t5_yuzhao li (u3035801)

  1. 1. Made by: Yuzhao Li Student ID:u3035801
  2. 2.  How many of you are using Skype, or have ever used Skype?  Do you know what the VoIP is?
  3. 3.  Voice over Internet Protocol  A general term for a family of methodologies, communication protocols, and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol networks, such as the Internet.
  4. 4.  People’s voice or other sounds record by the computer as samples  Then the samples are send as packets over IP network to another computer and played there.
  5. 5.  Different from traditional Public Switched Telephony Network, VoIP has several advantages  Cost saving  Flexibility  Better voice quality
  6. 6.  A software application that provides telephone service using VoIP technology facilitating voice communication over the internet.  Available free for both PC and Macintosh platforms as well as Linux and pocket PC’s
  7. 7.  Founded in 2003 by the Swedish entrepreneur Niklas Zennstro, and a Dane Janus Friis  In October 2005, eBay purchased Skype  In October 2006, Skype 2.0 for Mac was released  In 2009, Skype 4.0 was released  On October 14 2010, Skype 5.0 for Windows was released with a slew of improvements and feature additions
  8. 8. 0 10 20 30 40 50 2005 2006 2007 2008 2009 active user (in millions) active user (in millions) Skype 13% MSN 11% some other VoIP service companies 76% percentage of market share (2010)
  9. 9.  Skype offers a number of features to its users, such as:
  10. 10. a) Rate control mechanism b) Voice codec c) Error-resilience mechanism d) Better relaying mechanism to go through NAT servers or firewalls
  11. 11.  Can find and locate users  Highly scalable  Strong NAT/ firewall traversal capability  Security feature  Integrated buddy list, presence information, chat, and audio conferencing
  12. 12.  Quality of service  Susceptibility to power failure  Still difficult to make a emergency calls  Lack of redundancy  The security issues
  13. 13.  MSN sends smaller packets with higher sending rate than Skype  MSN has higher variance in packet’s inter-arrival time while Skype sends packets in a stable fashion  Skype has better performance than MSN in MOS score  Skype can increase its throughput to recover missed data when suffering from higher loss rate, but MSN can’t  Skype has better mechanisms to go through NAT than MSN
  14. 14.  Clarity  Reliable  Can call any phone, local or international, not just computers  Quality of voice  Have many different options
  15. 15.  Skype have a lot of impacts on its users, and also may influenced people’s daily life.  For example, its impact on teaching and learning.  It opens up numerous options to teacher and students interactions and the Skype offers can potentially revolutionize the teaching and learning process. So that teachers can envision students exchanging ideas, cultures, and information using the free Skype to Skype feature from one classroom to another or one student to another.
  16. 16.  Weicheng Xiao. (2006). A performance Study of VoIP Applications: Skype vs. MSN. National Taiwan University  Lani Rexius. (2007). Skype- An Emerging Technology. London: Oxford University  About Skype. (2010). Retrieved October 26, 2010. from http://about.skype.com/  History of Skype. (2010).Retrieved October 26,2010. from http://en.wikipedia.org/wiki/Skype
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