[Unit]
Description=ISDN Services
Requires=syslog.target network.target

[Service]
Type=oneshot
ExecStart=/usr/libexec/isdn start
ExecStop=/usr/libexec/isdn stop
Environment=BOOTUP=serial
Environment=CONSOLETYPE=serial
StandardError=syslog
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target