Blink (SIP client)

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]

Blink
Developer(s)	AG Projects
Initial release	December 1, 2009 (2009-12-01)
Stable release	Blink Pro for macOS 5.2.0 (June 26, 2021; 3 years ago (2021-06-26)) [±] [1] Blink for Windows 5.2.0 (February 27, 2022; 3 years ago (2022-02-27)) [±] [2] Blink for Linux 5.2.0 (June 9, 2022; 3 years ago (2022-06-09)) [±] [3]
Repository	https://github.com/AGProjects/blink-qt
Written in	Python
Operating system	macOS, Microsoft Windows and Linux
Size	30M Cocoa version 20M Qt version
Available in	English
License	Blink License (free software versions + Shareware versions)[4]
Website	icanblink.com

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

Features

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

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

Privacy and Security

The Linux and macOS 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.