DNS Support

The Oracle® Enterprise Session Border Controller supports the DNS resolution of IPv6 addresses; in other words, it can request the AAAA record type (per RFC 1886) in DNS requests. In addition, the Oracle® Enterprise Session Border Controller can make DNS requests over IPv6 transport so that it can operate in networks that host IPv6 DNS servers.

For mixed IPv4-IPv6 networks, the Oracle® Enterprise Session Border Controller follows these rules:

If the realm associated with the name resolution is an IPv6 realm, the Oracle® Enterprise Session Border Controller will send the query out using the AAAA record type.
If the realm associated with the name resolution is an IPv4 realm, the Oracle® Enterprise Session Border Controller will send the query out using the A record type.

In addition, heterogeneous address family configuration is prevented for the dns-ip-primary, dns-ip-backup1, and dns-ip-backup2 parameters.