NO, the ss7 network can not handle registratios by itself

ehen new numbers are added to a customer in the PSTN network wireless or wireline those are activated through provisioning datafill on their own switch

SCP (service control point) is accessed by the swicthes to resolve inteligent services as 800 number resolutions and it has databases for that resolution
also serve as LNP local number portability service

the update of the LNP database usually is replicated from another Database national when new ranges of numbers are assigned to differents operators..