1st Tier and *RBOC

• AT&T

• Sprint

• MCI

• Qwest

• WorldCom

• SBC

• Broadwing

• Southern Bell

• Global Crossing

• Cable & Wireless (Exodus)

*  RBOC: Regional Bell operating companies
** CLEC:  Competing local exchange carriers

2nd Tier, **CLEC and Reseller

• XO

• Internap

• Netifice (Epoch Internet)

• Talk America 

• Allegiance Telecom 

• PaeTec 

• TSI 

• TMC 

• ACC Business 

• Access one 

• Mega Path 

• Telepacific 

• ATI Telecom

• Raindance Conferencing 

• TNCI