brew install awseward/homebrew-tap/call_status_checker
To follow the launchd service log:
tail -f /usr/local/var/log/call_status_checker/watch.log
There's some potential for permissions issues-- in such cases, can run:
mkdir -p /usr/local/var/log/call_status_checker
touch /usr/local/var/log/call_status_checker/watch.log
chown -R "${USER}" /usr/local/var/log/call_status_checker