If you are currently using a Video/Voice Calling app like Google Hangouts, Skype, Viber or Zoom, you should pick an alternative here. Please note that many of the above instant messengers also support {% include badge.html color="info" text="VoIP" %}. The software listed below are 
primarily Voice/Video focused.
 
{% include cardv2.html
  title="Linphone"
  image="/assets/img/svg/3rd-party/linphone.svg"
  website="https://www.linphone.org/"
  privacy-policy="https://www.linphone.org/terms-and-privacy"
  description="Linphone is an open-source SIP Phone and a free voice over IP service, available on mobile and desktop environments and on web browsers. It supports ZRTP for end-to-end encrypted voice and video communication."
  forum="https://forum.privacytools.io/t/discussion-linphone/751"
  github="https://github.com/BelledonneCommunications"
  windows="https://www.linphone.org/technical-corner/linphone?qt-technical_corner=2#qt-technical_corner"
  linux="https://www.linphone.org/technical-corner/linphone?qt-technical_corner=2#qt-technical_corner"
  mac="https://www.linphone.org/technical-corner/linphone?qt-technical_corner=2#qt-technical_corner"
  fdroid="https://f-droid.org/packages/org.linphone"
  googleplay="https://play.google.com/store/apps/details?id=org.linphone"
  ios="https://itunes.apple.com/us/app/linphone/id360065638?mt=8"
%}
{% include cardv2.html
  title="Mumble"
  image="/assets/img/svg/3rd-party/mumble.svg"
  website="https://mumble.info/"
  description="Mumble is an open-source, low-latency, and high quality voice chat application primarily intended for use while gaming. Note that while Mumble doesn't log messages or record by default,