Under what situation may a station transmit third party communications while being automatically controlled?

The FCC rules strictly regulate automatic control and third-party communications to prevent unattended stations from transmitting inappropriate or illegal traffic. However, modern digital networks (such as packet radio or Winlink) routinely forward messages automatically. To allow these valuable digital forwarding networks to function, the FCC rules specifically permit third-party communications under automatic control, but only for RTTY and data emissions. Voice modes like SSB or CW require local or remote control by a human control operator to ensure compliance.