  A model for the nucleon-antinucleon interaction is presented which is based
on meson-baryon dynamics. The elastic part is the $G$-parity transform of the
Bonn $NN$ potential. Annihilation into two mesons is described in terms of
microscopic baryon-exchange processes including all possible combinations of
$\pi,\eta,\rho,\omega,a_0,f_0,a_1,f_1,a_2,f_2,K,K^*$. The remaining
annihilation part is taken into account by a phenomenological energy- and state
independent optical potential of Gaussian form. The model enables a
simultaneous description of nucleon-antinucleon scattering and annihilation
phenomena with fair quality.
