379 / | HD | TELEPHONIC COMMUNICATIONS |
201 | DF | SPECIAL SERVICES {9} |
210 | .~ Call diversion (e.g., call capture) {4} | |
211 | DF | .~.~> Call forwarding |
212 | DF | .~.~> Call transfer |
213 | DF | .~.~> Intercept (e.g., dead or changed number) |
214 | DF | .~.~> Secretarial or answering service |