The following tables (Telephone and Operator Features for MLX Telephones, Telephone and Operator Features for Multiline 4400-Series Telephones, Telephone Features for 4400, 4400D, and Single-Line Telephones, and Telephone Features for ETR and MLS Telephones) list the telephone and operator features that can be assigned to telephones or consoles either through centralized telephone programming or by users from their telephones.