US lawMassachusettsRegulations560 CMR — State 911 Department560 CMR 4.00 — Regulations governing enhanced 911 service for multi-line telephone systems4.02560 CMR 4.02Scope and ApplicabilityYear: 2026Length: 17 wordsOfficial source 560 CMR 4.00 applies to all new or substantially renovated multi-line telephone systems beginning July 1, 2009.Previous560 CMR 4.01Next560 CMR 4.03