Server Availability Monitoring

The Oracle® Enterprise Session Border Controller can probe an ENUM server’s health by sending it a standard ENUM NAPTR query and receiving a valid answer. The query is for the phone number defined in the health query number parameter, which should be one that the ENUM servers can positively resolve. As long as the query succeeds, that ENUM server maintains its in-service state and is available for ENUM queries. Any lack of response, whether network based (time-outs), or application based (DNS error or not found response) is considered a query failure and the server is set to OOS and unavailable for ENUM queries.

The Oracle® Enterprise Session Border Controller continuously checks the health of all configured ENUM servers to determine their current state and monitor for failed servers’ return to service. All servers are checked for availability at the health query interval parameter, as defined in seconds.

Note:

When ENUM server availability monitoring is enabled, ENUM servers can only exist in an in-service or out-of-service states; Without the health query interval defined, server availability monitoring is disabled, and ENUM servers exist in three service states.