The new relativistic Coulomb-like threshold resummation S- and L-factors in
quantum chromodynamics are received. Consideration is conducted within the
framework of quasipotential approach in quantum field theory formulated in the rel
ativistic configurational representation in the case of two particles of unequal masses.
We also suggest a new model expression for R(s) in which threshold singularities are
summarized into a main potential contribution.