| 379 / | HD | TELEPHONIC COMMUNICATIONS |
| 90.01 | DF | TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE) {8} |
| 93.01 | DF | .~ Having transmission of a digital message signal over a telephone line {9} |
| 93.02 | DF | .~.~ Access restricting {2} |
| 93.04 | | .~.~.~ Two or more calls |