379 / | HD | TELEPHONIC COMMUNICATIONS |
111 | DF | WITH USAGE MEASUREMENT (E.G., CALL OR TRAFFIC REGISTER) {3} |
114 | DF | .~ Call charge metering or monitoring {5} |
121 | DF | .~.~ At central office {4} |
124 | DF | .~.~.~ Pulse counting or accumulating (e.g., "message metering") {3} |
128 | .~.~.~.~ Time of day controlled |