Lua SwxWare v13.10
This function returns the name of the user that transferred the call into current call routing script.
local sName = PBXCall.TransferrerName()
This function returns a string value.
If the call is a direct call and not a transferred call the function returns an empty string.
If you are interested in the number of the user who transferred the call you can use the PBXCall.TransferrerNumber() function.