Debian 10

Install MariaDB

apt-get -y install mariadb-server

Install voipmonitor sensor

Installing sensor - voipmonitor service

mkdir /usr/src/voipmonitor
cd /usr/src/voipmonitor
wget --content-disposition http://www.voipmonitor.org/current-stable-sniffer-static-64bit.tar.gz -O x.tar.gz
tar xzf x.tar.gz 
cd voipmonitor-*
./install-script.sh

Install voipmonitor GUI

Installation of packages needed by voipmonitor's GUI

apt-get -y install php php-gd php-mysql php-cli libapache2-mod-php php-mbstring php-zip tshark mtr librsvg2-bin gsfonts rrdtool

(When asked if non-superuser can capture traffic You can answer No)

create database needed for voipmonitor

mysqladmin create voipmonitor

Installing IOncube - php loader / decryptor

wget http://voipmonitor.org/ioncube/x86_64/ioncube_loader_lin_7.3.so -O /usr/lib/php/20180731/ioncube_loader_lin_7.3.so
echo "zend_extension = /usr/lib/php/20180731/ioncube_loader_lin_7.3.so" > /etc/php/7.3/mods-available/ioncube.ini
ln -s /etc/php/7.3/mods-available/ioncube.ini /etc/php/7.3/apache2/conf.d/01-ioncube.ini
ln -s /etc/php/7.3/mods-available/ioncube.ini /etc/php/7.3/cli/conf.d/01-ioncube.ini

Installing voipmonitor GUI

cd /var/www/html
rm -f index.html 
wget "http://www.voipmonitor.org/download-gui?version=latest&major=5&phpver=73&festry" -O w.tar.gz
tar xzf w.tar.gz
mv voipmonitor-gui*/* ./

Finalizing steps

For working alerts / reports, system needs to run periodicaly script using scheduller

echo " * * * * * root php /var/www/html/php/run.php cron" >> /etc/crontab
kill -HUP `pgrep cron`

Create spooldir for sensor

mkdir /var/spool/voipmonitor/

Set privileges for apache

chown www-data /var/spool/voipmonitor/
chown -R www-data /var/www/html
/etc/init.d/apache2 restart

Edit sensor settings and start sensor - edit /etc/voipmonitor.conf and set appropriate mysql password,save* options and interface option (interface names gets changed in deb9/deb10)

/etc/init.d/voipmonitor start

Enable service start via sysV with:

systemctl enable voipmonitor