 In 1977, Vadic responded with the VA3467 triple modem, an answer-only modem sold to computer center operators that supported Vadic's 1,200-bit/s mode, AT&T's 212A mode, and 103A operation.The "Hush-a-Phone" decision applied only to mechanical connections, but the "Carterfone" decision of 1968, led to the FCC introducing a rule setting stringent AT&T-designed tests for electronically coupling a device to the phone lines.This opened the door to direct-connect modems that plugged directly into the phone line rather than via a handset.