Basic FreePBX / Asterisk configuration

Hello, I'm looking to implement FreePBX for my business. It's a smaller operation (2 locations) with only a few employees. Only 5 or 6 extensions are needed. I have installed and partially configured FreePBX on a web server and created a trunk for voip.ms. The system is partially working, but I cannot get my softphones to connect. I'm certain it's a port / firewall / permissions issue, but haven't been able to figure it out. I tested out Zulu since it comes prepackaged with FreePBX and has a free 2 seat license. (again only using this as a test) but the Zulu clients connect just fine. There is only 1 incoming phone number (DID), and I can receive calls just fine in FreePBX, but dialing out from Zulu does not work (it just rings and goes to FreePBX voicemail). Here's a list of the main things I would like you to do: - Create 5 extensions (i.e., 100/200/300/400/500) - Incoming calls should be answered automatically by auto attendant with music on hold (I'll create a recording that says "please wait for assistance, someone will be right with you", then shortly thereafter "please continue to hold, or press 2 to leave a voicemail"). If nobody answers within 60 seconds, the call will be forwarded to my cell phone - figure out the correct softphone configuration and confirm that calls can be sent and received by softphone (using whichever softphone supports the highest quality codecs) - Ensure that FreePBX is configured to use the highest quality codecs available (limited by our [login to view URL] provider, of course) - Harden FreePBX security - Is it recommended to set up a VPN to connect to a remote FreePBX installation? If so, we'll need to configure OpenVPN as well (I know how to configure the OpenVPN client on computers, but not sure how the physical phones would know to use the VPN) That's basically it for the moment. Let me know if you have any questions. Only high quality providers with lots of 5 star reviews will be considered!! If you have negative feedback and/or low feedback, please don't bother bidding. Thanks!