for) automated-payment schemes and Bacs Limited owning the infrastructure to operate them. Bacs Limited used that name for one year, becoming Voca Limited on 12 October 2004. Voca Limited merged with the UK national switch provider LINK Interchange Network on 2 July 2007, and became Vocalink. Vocalink owns the infrastructure on which payment schemes operate, and BPSL maintains the schemes. Bacs users began moving from the telephone dial-up BACSTEL service (introduced in 1983 to replace magnetic media) to BACSTEL-IP, a faster, more secure Internet-based service, in 2003. All Bacs users, including businesses that make payments to their suppliers or operate their staff payroll electronically, were required to move to BACSTEL-IP by the end of December 2005 or return to using cheques. When BACSTEL-IP was introduced, all software used to make a connection to Bacs required approval; it is only possible to connect with software from the list of Bacs Approved Solution Suppliers (BASS) or an approved bureau. New service users were required to use AUDDIS, a more efficient system for organizations to send new direct-debit instructions to their customers' bank or building society electronically instead of on paper, in 2008. That year, annual direct-debit volume surpassed three billion; volumee reached 3.5 billion by 2013, with 100 billion payments processed since 1968. Further developments Bacs processed a record 5.8 billion transactions in 2014 for a total of £4.4 trillion, including 3.6 billion direct debits. The number of payments passing through the Bacs system topped six billion for the first time the following year, with a value of £4.6 trillion. The number of direct debits processed in 2015 increased by 239 million over the 2014 total. A record 103 million transactions were processed in a single July 2015 day. That year, it was announced that the number of payments handled by Bacs since 1968 had exceeded 110 billion. In 2016, 6.22 billion transactions were processed with a value of £4.8 trillion; the number of direct-debit payments exceeded four billion. Daily processing records were set twice that year: 109.3 million payments on one day at the end of September, surpassing the April high of 103.7 million. A record 6.34 billion payments were processed in 2017, totalling £4.9 trillion. At the end of November 2018, the number of daily transactions processed by Bacs reached a new high of 123 million; a monthly record of 580 million payments was set in August of that year.