linphone open browser link sip/tel auto call (xdg-open) Tested on Linux Mint 20, Ununtu 20.04, Ubuntu 16.04
apt install linphone
copy files your linux home dir and
chmod 755 ~/.local/bin/linphone-fix
update-desktop-database
uncomment last line in file ~/.local/bin/linphone-fix
tail -f /tmp/linphone-fix.log