  We compute the bound state properties of three-dimensional scalar $\phi^4$
theory in the broken phase. To this end, we extend the recently developed
technique of spectral Dyson-Schwinger equations to solve the Bethe-Salpeter
equation and determine the bound state spectrum. We employ consistent
truncations for the two-, three- and four-point functions of the theory that
recover the scaling properties in the infinite coupling limit. Our result for
the mass of the lowest-lying bound state in this limit agrees very well with
lattice determinations.
