Blink (SIP client)

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Developer(s)AG Projects
Initial releaseDecember 1, 2009 (2009-12-01)
Stable release
Blink Pro for Mac OSX 5.2.0 (June 26, 2021; 16 months ago (2021-06-26)) [±] [1]

Blink for Windows 5.2.0 (February 27, 2022; 8 months ago (2022-02-27)) [±] [2]

Blink for Linux 5.2.0 (June 9, 2022; 5 months ago (2022-06-09)) [±] [3]

Written inPython
Operating systemMac OS X, Microsoft Windows and 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 an exception to permit the inclusion of commercial proprietary modules).[4][5]

The software is written in Python for macOS's Cocoa, with a later port to Qt for supporting Microsoft Windows, Linux, AmigaOS.[6][7]


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. Compatible with Asterix.[8]

Alternative to Skype[edit]

According to Jason Hibbets, an Advisor at Red Hat, Blink is a popular alternative to Skype[9]

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][10] 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 (Linux)".
  4. ^ a b "Help for Blink Pro and Blink Lite for OSX".
  5. ^ a b "NLnet; Blink Qt Messaging". NLnet Foundation with financial support from the European Commission. 2022-08-19. Archived from the original on 2022-08-19. Retrieved 2022-08-19.
  6. ^ "The Blink (SIP client) Open Source Project on Open Hub". Open_Hub. Retrieved 2022-08-19.{{cite web}}: CS1 maint: url-status (link)
  7. ^ Newton, Rusty (2014-01-30). "Installing Blink SIP client - Asterisk Project - Asterisk Project Wiki". Archived from the original on 2022-08-19. Retrieved 2022-08-19.
  8. ^ Hibbets, Jason (2011-05-27). "Poll: Open source alternatives to Skype |". Archived from the original on 2022-08-19. Retrieved 2022-08-19.
  9. ^ "Download Blink". Blink Project's Website. Retrieved 22 June 2016.

External links[edit]