apt update && apt install -yq gnupg2 wget lsb-release &&
wget -O - https://files.freeswitch.org/repo/deb/debian-release/fsstretch-archive-keyring.asc | apt-key add - &&
echo "deb http://files.freeswitch.org/repo/deb/debian-release/ `lsb_release -sc` main" > /etc/apt/sources.list.d/freeswitch.list &&
echo "deb-src http://files.freeswitch.org/repo/deb/debian-release/ `lsb_release -sc` main" >> /etc/apt/sources.list.d/freeswitch.list &&
apt -y update &&
apt -y build-dep freeswitch