Yes, my problem, was that I needed to set it up as an extension and let it (SPA 3102) register as that extension. For dialing out, I would have to dial that extension number first, and then dial my intended external PSTN number. For incoming from PSTN->VOIP, my dial plan was simply (S0<:10>) where 10 is the extension I wanted the PSTN call sent to.
Thanks.