1956: Bell Canada • Northern Electric
1984: Ameritech • Bell Atlantic • Bell Communications Research • BellSouth • NYNEX • Pacific Telesis • Southwestern Bell • U S West
1996: Lucent Technologies • NCR
2001: AT&T Broadband • AT&T Wireless
AT&T Consumer Lease Services • Advanced American Telephones • Agere Systems • AirTouch • Avaya • Dex Media • Idearc • MediaOne Group • R. H. Donnelley Publishing & Advertising of Illinois • Telcordia Technologies • Teradata • Verizon New Hampshire • Verizon Maine • Verizon Vermont (pending)