 In June 1999 MCI WorldCom introduced vBNS+ which allowed attachments to the vBNS network by organizations that were not approved by or receiving support from NSF.The vBNS pioneered the production deployment of many novel network technologies including Asynchronous Transfer Mode (ATM), IP multicasting, quality of service, and IPv6.After the expiration of the NSF agreement, the vBNS largely transitioned to providing service to the government.