When are Service Providers (SPs) required to maintain records of permanently disconnected numbers and report them to the Reassigned Number Database (RND)?

See Public Notice, DA 20-706, at https://docs.fcc.gov/public/attachments/DA-20-706A1.pdf requiring SPs to start maintaining records beginning July 27, 2020, and See Public Notice, DA-21-134, at https://docs.fcc.gov/public/attachments/DA-21-134A1.pdf, requiring initial seed data to be reported to the RND beginning April 15, 2021, and smaller providers to report initial data beginning October 2021.