  Diffusive cosmic-ray transport in nonuniform large-scale magnetic fields in
the presence of boundaries is considered. Reflecting and absorbing boundary
conditions are derived for a modified telegraph equation with a convective
term. Analytical and numerical solutions of illustrative boundary problems are
presented. The applicability and accuracy of the telegraph approximation for
focused cosmic-ray transport in the presence of boundaries are discussed, and
potential applications to modeling cosmic-ray transport are noted.
