Hi all, Here's a very quick and easy way to check if a rtpproxy is up, and responding on it's UDP command channel using the check_udp nagios utility: /usr/local/libexec/nagios/check_udp -e "123 " -s "123 V" -H your.rtp.host.com -p 22222 Note, this only works when you make rtpprxy listen on a UDP port, you have to find another method to monitor rtpproxy when it listens on a local socket. -Jev