[Unit]
Description=Asterisk PBX
Wants=nss-lookup.target
Wants=network-online.target
After=network-online.target

[Service]
PIDFile=/run/asterisk/asterisk.pid
ExecStart=/usr/sbin/asterisk -fn
ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=basic.target
Also=systemd-networkd-wait-online.service