Skype (page 2) 20 July 2009 Hotfix 14 September 2009 Hotfix 21 September 2009
  • Skype Access: An incorrect notification message appeared "This WiFi hotspot does not support Skype Access" when users tried to connect to Skype Access when Airport was set to off.
  • Chat: Text was not visible within the chat input field that contained a certain Unicode character.
  • Contacts: Platform specific Skype for Mac OXS 10.3 (Panther); Skype froze after deleting unread missed events.
  • Contacts: Mood message appeared blank after playing iTunes.
  • Contacts: Contacts were still visible in the "Manage Contact Groups" after deleting them from the Contact List.
  • Video: Video appeared blank between Skype for Windows and Skype for Mac.
  • Video: A video error message appeared at the beginning of a video call.
  • Video: Video and screen sharing functionality did not work after a multiÉchat
  • Screen Sharing: Recipients screen remained black after screen sharing was resumed.
  • Screen Sharing: A green line appeared when screen sharing between Skype for Windows and Skype for Mac OXS 10.4 (Tiger).
  • Screen Sharing: Skype froze when screen sharing between Skype for Windows and Skype for Mac.
  • Miscellaneous: An incorrect informative message appeared when entering more than 20 characters for a password.
  • Miscellaneous: The Show in Finder option was not available after cancelling a file transfer.
  • Miscellaneous: Platform specific OSX 10.3 (Panther); Skype could not connect to the network. Skype froze when selecting "Quit Skype".
  • Miscellaneous: The typing indicator appeared within a multiÉchat even though no one was typing.
  • Miscellaneous: An incorrect informative message appeared when trying to call an emergency number.
  • Miscellaneous: Commas were not visible in mood messages.
  • Miscellaneous: A users name and password field appeared blank after selecting the option "Remember my name and password on this computer".
  • SMS: An error message appeared when dragging and dropping a participant to an SMS group.
  • SMS: An error message appeared when closing the SMS window after sending to multiple recipients.
  • SMS: SMS functionality did not recognize newly updated telephone numbers associated to Skype Out contacts.
  • SMS: Ringing sound was not available on incoming calls. 8 February 2010 Fixes issues 29 October 2010 Fixed issues:
    • Fixed login issues to Skype 17 November 2010 ? 8 February 2011 ? 24 March 2011 Hotfix 14 April 2011 ? 9 May 2011
  • Security updates
  • Resolves video freezing in high-packet loss networks
  • Fixes minor bugs 1 July 2011 ? 5 July 2011
  • Improved Multi-tasking
  • Group Screen Sharing
  • Sidebar enhancement
  • Support for Mac's built-in HD and Logitech's B910 HD cameras
  • Minor bug fixes 26 July 2011
  • Updated localizations
  • The removal of "Professional Account"
  • Minor improvements 8 August 2011
  • Updated contact list view
  • New contact grid view
  • Support for OS X Lion
  • Minor improvements 1 September 2011 Sometimes Skype crashed during video calls
  • Fixes a problem in Norwegian localization which could lead to client freeze 15 September 2011
  • Facebook connect
  • Facebook chat
  • Skype Home
  • Improved video quality
  • Minor bug fixes 17 November 2011 Facebook video calls 12 January 2012
  • Improved Call UI
  • Accept incoming call with video
  • Improvements in quality and stabilization 13 September 2011 Adds support for Windows 8
5.6 6 March 2012 Automatic Updates
  • Improved UI for group video calling
  • New full screen mode in OS X Lion
  • Ability to delete conversations
  • Ability to disable Audio Gain Control
5.7 12 April 2012 ?
5.7 9 May 2012 Hotfix
5.8 14 June 2012
  • More Compact Contacts Monitor
  • Improved Screen Sharing (Premium)
  • OS X Mountain Lion Ready
  • Resizable Contact List Columns
  • Improved SMS Usability
  • Improved automatic reorientation of mobile video calls
  • Keyboard shortcut for Volume Control
  • Full HD video-calling



Color Meaning
Red Release no longer supported
Green Release still supported
Blue Future release
Major Version Release Date Significant Changes 21 June 2004

first public beta[69]

1.0 1 February 2005

first stable version 25 May 2005

? July 2005

? 2005

?  ?

?  ?

? 28 June 2006

sound system upgrade and more 17 August 2006

beta 27 September 2006

beta 4 October 2006

stable  ?


1.4.0.xx 2 May 2007


1.4.0.xx 23 May 2007


1.4.0.xx 14 June 2007

? 1 August 2007

improved audio

1.4.0.xx 4 October 2007


2.0 7 November 2007

video is here

2.0.x 6 February 2008


2.0.x 13 March 2008


2.1 26 August 2009

? 21 January 2010


2.2 6 April 2011

? 7 June 2011

? 14 May 2012

libpng related security update

4.0 14 June 2012

? 17 June 2012

4 bugs fixed[70]

System and Software


Skype uses a proprietary Internet telephony (VoIP) network called the Skype protocol. The protocol has not been made publicly available by Skype and official applications using the protocol are closed-source. Part of the Skype technology relies on the Global Index P2P protocol belonging to the Joltid Ltd. corporation. The main difference between Skype and standard VoIP clients is that Skype operates on a peer-to-peer model (originally based on the Kazaa software[71]), rather than the more usual client–server model (note that the very popular SIP model of VoIP is also peer-to-peer, but implementation generally requires registration with a server, as does Skype).

Protocol detection and control

Many networking and security companies claim to detect and control Skype's protocol for enterprise and carrier applications. While the specific detection methods used by these companies are often private, Pearson's chi-squared test and Naive Bayes classification are two approaches that were published in 2007.[72] Combining statistical measurements of payload properties (such as byte frequencies and initial byte sequences) as well as flow properties (like packet sizes and packet directions) has also shown to be an effective method for identifying Skype's TCP- and UDP-based protocols.[73]

Audio codecs

G.729 and SVOPC. Skype added a Skype-created codec called SILK to Skype 4.0 for Windows and other Skype clients. SILK is intended to be "lightweight and embeddable".[74]

Video codecs

VP7 is used for versions prior to Skype 5.5[75][76][77][78][79]

As of version 5.7 VP8 is used for both group and one on one standard definition video chat and H264 is used for 720p and 1080p high definition group and one on one video chat.[80][81]

Published:Sep 25th 2012
Modified:Sep 25th 2012

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