The DSP calculator has a screen that asks if you are configuring your VWIC T1 card for G.711 or G.729a. If you configure it for G.711 it says 2 DSPs. If you configure it for G.729a is says 3. The CLI commands are the same however. I have always chosen G.711 and and then added DSPs for transcoding. If a call comes in the PRI and has to be transcoded to G.729a, does it use the DSPs on the gateway reserved for transcoding for that purpose?