In this letter the application of the generalized duality transformati
on is clarified. The analysis replies to the comment by Lakhtakia and
Weiglhofer, which comment contains the claim that with duality one can
support the assertion that Tellegen media are not uniquely recognizab
le. The fallacy of the arguments of Lakhtakia and Weiglhofer is shown
to result from incorrect understanding of duality.