Lua SwxWare v13.10
This function returns the number of the user that transferred the call into current call routing script.
local sNumber = PBXCall.TransferrerNumber()
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 name of the user who transferred the call you can use the PBXCall.TransferrerName() function.