What is the difference between ami action BlindTransfer and Atxfer

Is there an action an attended transfer can be applied?

ATXFR = A calls B. B initiates an ATXFR and dials C. B and C talk. B hits ATXFR again. B leg ends and A and C are now talking.

BTXFR = A calls B. B initiates a BTXFR. B leg ends. A is now dialling C.

There is one Atxfer but I havent tested