Using Virtual SBC7.3
Create session-agent using the following:
ping-method OPTIONS;hops=0
ping-interval 30
ping-send-mode keep-alive
This will cause the SBC to send a ping to the session-agent, like your NS/Redirect server, every 30 seconds. If the session-agent does not respond it will be considered out of service. If this agent is in a session agent group SAG (session-group) with other session agents then this agent in the group will not be used, but the other agents in the group will, if available.
I also noticed a SNMP message when this goes out of service.
