Operator-ENUM is a number portability service for packet switched networks. With operator ENUM, a telecom company can solve routing info to recipient's phone in a form that is native to the network technology.
Circuit switched Number portability in FInland is based on national tele-company ID's (ty-tunnus) which are administered by Traficom. In packet switched networks number portability is built using standard DNS (Domain Name Service)-technology.
Operator-ENUM cannot yet run as an independent service because majority of Finnish operator networks are still using circuit switched technology. This is why Óperator-ENUM is currently offered as an add-on option for number portability services.