Renewing the Registration
ENUM domains are registered for an initial period of one year only.
If you wish to go on using your ENUM domain, you must request the renewal of the domain. For this purpose, you will be required to submit evidence that you are still the legitimate holder of the corresponding telephone number.
Usually, your provider will contact you in good time before your ENUM domain expires and will then perform revalidation and renewal on your behalf.
Read more on Validation.