DNS Entry Maximum TTL

DNS maximum time to live (TTL) is user-configurable and complies with RFCs 1035 and 2181.

One can set the DNS maximum TTL on the Oracle® Enterprise Session Border Controller permitting the DNS entry information to be held until that time is exceeded. One can specifiy the dns-max-ttl parameter per network interface and/or to support the DNS ALG feature. The default value is 86400 seconds (24 hours). When the Oracle® Enterprise Session Border Controller configured maximum value has been exceeded, the DNS TTL value is set to the configured maximum and a log entry is written. Otherwise the Oracle® Enterprise Session Border Controller honors the lower value in the DNS response. The Oracle® Enterprise Session Border Controller restricts all DNS entries minimum TTL value of 30 seconds, which the system's implementation of SIP requires.