The Default APN for DNS Failure feature makes it possible for the operator to ensure that calls and PDP context activation are not rejected because of possible UE errors, such as, the UE requested a misspelled APN name. This feature allows the operator to promote activation success if
- the DNS query would fail
- the subscriber-requested APN is not present in the subscription record,
- the wildcard subscription is present in the subscription record.
This functionality is configured with the use of the require-dns-fail-wildcard keyword. This keyword is currently supported only on MME.
By default, this new functionality is not enabled. If not enabled, then the MME sends a PDN connectivity reject to the eNodeB if the DNS resolution fails for the reasons indicated above.
Relationships to Other Features
Operator Policy - Default APN for DNS Failure is configured with the commands in the APN Remap Table configuration mode which is a key component of the Operator Policy feature. For information about this feature, see the chapter on Operator Policy.