This work is a theoretical study of the phase relations of the ion-dipole mixture, as estimated by the mean spherical approximation. Phase diagrams have been calculated for different values of the model parameters (ion charge, dipole moment, dipole, and ion size) and classified according to the nomenclature of van Konynenburg and Scott. The different types of topologies have been mapped onto a global phase diagram in the space of only two dimensionless parameters, denoted respectively alpha(1) and alpha(2). The alpha(1) parameter measures the ratio of force fields produced by dipoles and ions, whereas the alpha(2) parameter is the ratio of the dipole diameter to the ion diameter. For mixtures of equal-sized ions and dipoles the following sequence of phase topology has been recognized with increasing alpha(1) parameter; type III, type IIIm, type IV, type II, type II with double azeotropy, type IV with double azeotropy, and type III-HA. More complex topologies are obtained for alpha(2) values below and above 1 (gas-gas equilibria, heteroazeotropy, azeotropy). It is shown that the global phase diagram provides insights on the phase topology of water-salt and water-salt-gas systems.