Endoscopic Classification for Quasi-Split Classical Groups

Describe the discrete automorphic and local spectra of quasi-split classical groups in terms of Arthur parameters $\psi :L_F\times S{L}_2\left(C\right)\to {}^{L}G\backslash psi:\; L\_F\; \backslash times\; SL\_2(\backslash mathbb\{C\})\; \backslash to\; \{\}^LG$ and establish the associated stable character identities and packet decompositions.