The renewed business process outsourcing contract with Xansa will now last an additional six years.
Xansa will continue to manage BT's UK operations for finance and accounting, transaction processing, and ledger and payroll services - drawing on Xansa's onshore and offshore capabilities in India.
The extension covers finance and administration processing, accounts payable, cash, treasury, payroll, ledger and reporting services.
"Xansa has worked with BT for many years. Not only does its outsourcing service provide us with transaction process expertise, but the company has an in-depth understanding of our business and is committed to helping us deliver our key outcomes," said Andrew Kemp, group director of reporting, planning and analysis at BT.
He said, "Xansa will deliver an efficient and cost-effective service, with the flexibility to achieve business change through investment in governance and service management. We are therefore pleased to be extending our relationship with Xansa for a further six years."