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In this paper we gives the Langlands parameters of Langlands' packets ofdiscrete series using the twisted endoscopy as explained by Arthur; this holdsfor orthogonal, symplectic, unitary and G-Spin groups and gives the most simpleproof available. We have assume that the groups are quasi-split but this isjust for simplicity. The proof explaines first what is the classification fromthe representation's theory point of view; this gives the Langlands' packetspurely in terms of representation theory. And then using the theory ofL-function of Shahidi and the doubling method of Rallis and Piatetskii-Shapiro,we translate this result in term of the $L$-group. Only the first part differsat some places of Arthur's point of view and gives more results aboutreducibility points of induced representations. We hope that this paper willmake very clear how fruitful is the doubling method.

Paquets stables des s\'eries discr\`etes accessibles par endoscopie tordue; leur param\`etre de Langlands