While in the Master zone your hostname is pointed to an IP address, ENUM zone translates telephone numbers into Internet addresses.
Login in your account, click on the DNS zones Add new button and click on the Primary ENUM zone box. The telephone number must be entered in a reverse format with dots separating each digit. For example, if you would like to add a Primary ENUM DNS zone for telephone number +11234567899, the Primary ENUM DNS zone must be: 18.104.22.168.22.214.171.124.2.1.1.e164.arpa.
The Secondary ENUM DNS zone is the read-only copy of the DNS records. This means that the DNS records cannot be added directly to the Secondary ENUM DNS zone. The Secondary ENUM DNS zone can receive the updated records only from the Primary ENUM zone of the DNS server.
For creating Secondary ENUM Zone, you need to Login in your account, click on the DNS zones Add new button, click on the Secondary ENUM zone box, write the ENUM zone name as is showed above, enter the Primary server IP and click on "Register".
The records can be managed only from the Primary servers.