That’s great news, thanks a lot for the update!We're on the final testing stage before release. The fix will be released this week.
Please do the following:We can't update online because the server is on an isolated network, may we get a way to install offline?
tar -xvzf FlashphonerWebCallServer-5.2.1988.tar.gz
sudo systemctl stop webcallserver
cd FlashphonerWebCallServer-5.2.1988
sudo ./install.sh
sudo systemctl start webcallserver