  In the present paper we introduce the notion of dilation of a multiparametric
linear stationary dynamical system (systems of this type, in particular
passive, and conservative scattering ones were first introduced in
func-an/9804130). We establish the criterion for existence of a conservative
dilation of a multiparametric passive scattering system. This allows to
distinguish the class of so-called $N$-passive systems preserving the most
important properties of one-parametric passive scattering systems.
