Implementation of the NPA 855 for Toll Free Services
Primary documents
| Letter | Published | Subject |
|---|---|---|
| PL-412 | 2010-10-01 | Implementation of the NPA 855 for Toll Free Services |
| PL-407R1 | 2010-08-17 | Implementation of the NPA 855 for Toll Free Services |
All documents are official NANPA planning letters (Tier A sources). This page consolidates every letter we have on record for this event; it is updated automatically when new letters are detected, with sensitive changes held for editorial review first.