379 / | HD | TELEPHONIC COMMUNICATIONS |
67.1 | DF | AUDIO MESSAGE STORAGE, RETRIEVAL, OR SYNTHESIS {13} |
68 | DF | .~ Dynamic audio signal recording or reproduction {4} |
70 | DF | .~.~ Call intercept or answering {7} |
74 | .~.~.~ Remote control over telephone line {3} | |
75 | DF | .~.~.~.~> Remote dictation |
76 | DF | .~.~.~.~> Announcement selection or replacement |
77 | DF | .~.~.~.~> Control by generated tone |