It's good news if you have a BT Business phone line, as 1571 is free.
If you are a new customer, you can order it online.
Alternatively, you can log in to My BT Business account in the small & medium business area of the main BT.com website and order BT Answer 1571 via My BT Business account.
You'll need your telephone number and BT account number to sign up to My BT Business account.
For further information about BT Answer 1571 and how to order it, please see BT Answer 1571.