February 19, 2020 UPDATE
An FCC notice was published in the Federal Register on February 19, 2020, correcting the final rules portion of the December 5, 2019 Federal Register notice, which published the August 2019 report and order on calls to 911 made from multi-line telephone systems. The December notice inadvertently removed definitions from the TRS rules. The corrections are effective February 19, 2020.
2/19/20 Federal Register Notice: https://www.govinfo.gov/content/pkg/FR-2020-02-19/pdf/2020-02723.pdf
12/5/19 Federal Register Notice: https://www.govinfo.gov/content/pkg/FR-2019-12-05/pdf/2019-20137.pdf
December 2, 2019 The Federal Communication Commission's Public Safety and Homeland Security Bureau has issued an ERRATUM correcting typos in its August 2019 multi-line telephone R&O regarding 911.
The Original 8/2/19 Report and Order can be found at - https://docs.fcc.gov/public/attachments/FCC-19-76A1.pdf