Blink (SIP client)

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Developer(s)AG Projects
Initial releaseDecember 1, 2009 (2009-12-01)
Stable release
Pro 4.5.1 (October 15, 2016; 2 years ago (2016-10-15)) [±][1]
 Blink for Windows 3.0.0 (December 16, 2016; 22 months ago (2016-12-16)) [±][2]
 Blink for Linux 3.0.3 (February 28, 2017; 20 months ago (2017-02-28)) [±][3]
Written inPython
Operating systemMac OS X, Microsoft Windows and GNU/Linux
Size30M Cocoa version
20M Qt version
Available inEnglish
LicenseBlink License (free software versions + Shareware versions)[4]

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)[4][5]

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.[6] All versions provide audio and video media encryption using ZRTP.


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

External links[edit]