[Freeswitch-users] need help with new setup

I'm new to Freeswitch but have some experience w/Asterisk. I need help switching over. I have two trunks (Broadvoice SIP and PSTN) All extensions are SIP and there are several. What files do I need to edit? sofia.conf for SIP? What about the PSTN? How do I route some calls over SIP and others over PSTN? How do I configure incoming calls from PSTN? Anyone have a sample Broadvoice config that you can send me? Also, which config file does Freeswitch use by default? freeswitch or freeswitch_combined?