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 php7.3-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 settings of a service and set it to start when boot

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

Binaries downloaded with first access of the GUI (voluntary)

You can speedup the installation process by downloading and installing binaries the GUI needs with following steps

wget http://sourceforge.net/projects/voipmonitor/files/wkhtml/phantomjs-2.1.1-x86_64.gz/download -O '/var/www/html/bin/phantomjs-2.1.1-x86_64.gz'
gunzip '/var/www/html/bin/phantomjs-2.1.1-x86_64.gz'
chmod +x '/var/www/html/bin/phantomjs-2.1.1-x86_64'
wget http://sourceforge.net/projects/voipmonitor/files/wkhtml/sox-x86_64.gz/download -O '/var/www/html/bin/sox-x86_64.gz'
gunzip '/var/www/html/bin/sox-x86_64.gz'
chmod +x '/var/www/html/bin/sox-x86_64'
wget http://sourceforge.net/projects/voipmonitor/files/wkhtml/tshark-2.3.0.3-x86_64.gz/download -O '/var/www/html/bin/tshark-2.3.0.3-x86_64.gz'
gunzip '/var/www/html/bin/tshark-2.3.0.3-x86_64.gz'
chmod +x '/var/www/html/bin/tshark-2.3.0.3-x86_64'
wget http://sourceforge.net/projects/voipmonitor/files/wkhtml/mergecap-2.3.0.3-x86_64.gz/download -O '/var/www/html/bin/mergecap-2.3.0.3-x86_64.gz'
gunzip '/var/www/html/bin/mergecap-2.3.0.3-x86_64.gz'
chmod +x '/var/www/html/bin/mergecap-2.3.0.3-x86_64'
wget http://sourceforge.net/projects/voipmonitor/files/wkhtml/t38_decode-2-i686.gz/download -O '/var/www/html/bin/t38_decode-2-i686.gz'
gunzip '/var/www/html/bin/t38_decode-2-i686.gz'
chmod +x '/var/www/html/bin/t38_decode-2-i686'