Blink (SIP client)

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Developer(s) AG Projects
Initial release December 1, 2009 (2009-12-01)
Stable release
Pro 4.4.1 (December 18, 2015; 9 months ago (2015-12-18)) [±] [1]
 Qt 1.4.2 (September 11, 2015; 12 months ago (2015-09-11)) [±] [2]
Written in Python
Operating system Mac OS X, Microsoft Windows and GNU/Linux
Size 30M Cocoa version
20M Qt version
Available in English
License Blink License (free software versions + Shareware versions) [3]

Blink is a Session Initiation Protocol (SIP) client distributed under the Blink license (GNU GPLv3 with the exception of possibility to include Proprietary software modules for commercial purpose) [3][4]

The software is written in Python for Cocoa, and lately it was ported to Qt for supporting Microsoft Windows and GNU/Linux platforms.


Blink is based on the Session Initiation Protocol, and beyond voice over IP, its features also include video, instant messaging, file transfer and multi-party conferencing sessions based on MSRP protocol, remote desktop sharing using RFB protocol (VNC), and SIMPLE presence using XCAP protocol.

Privacy and Security[edit]

The Linux and Mac OS X version of Blink implement OTR protocol end-to-end encryption and peer verification for chat media.[5] All versions provide audio and video media encryption using ZRTP.


  1. ^ "ChangeLog for Blink Pro (MacOSX version)". 
  2. ^ "ChangeLog for Blink Qt". 
  3. ^ a b "Help for Blink Pro and Blink Lite for OSX". 
  4. ^ "Download Blink". Blink Project's Website. Retrieved 22 June 2016. 

External links[edit]