| 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} |
| 71 | ![]() | .~.~.~ Consecutive use of recorded phrases or words to form message |