Linphone is an open source SIP phone for voice/video calls, instant messaging and conference calling
License: GPL-3.0
Web page: https://linphone.org
Source code: https://gitlab.linphone.org/BC/public/linphone-desktop
Translate: https://weblate.linphone.org/projects/linphone-desktop
Report the bug: https://gitlab.linphone.org/BC/public/linphone-desktop/-/issues/new
Download: x86_64: https://download.linphone.org/releases/linux/app/Linphone-5.3.2.AppImage