go to voxilla.com for comparisons of all these VoIP's. also consider onesuite.com 's VoIP offering ($2.95) if you make few LD calls (they charge for those) and just want local service. we've used them for 2 years for the few LD calls we make (2.9¢). -ken
p.s. we haven't tried their softphone yet, just the pay-in-advance LD.