Configure Dinstar Gateway Magnus

I have a Dinstar 8-port GSM/VoIP gateway here in the UAE and I’m ready to put it into production. My preferred stack is MagnusBilling, so the first task is a clean installation and full configuration of Magnus on a fresh Linux VPS. Once Magnus is up, I need the gateway registered, trunks and routing rules created, and a quick test call flow that proves inbound and outbound calling works end-to-end. Security is a must-have from day one. I want a properly hardened VPS firewall and strict IP whitelisting so only approved addresses can reach SIP, SSH and the Magnus web interface. If you have additional best-practice suggestions, I’m open to them, but IP whitelisting is non-negotiable. Deliverables • MagnusBilling installed, updated and secured on my VPS • Dinstar DGW-8XX gateway fully integrated (SIP registration, trunks, routes) • Firewall rules with IP whitelisting applied and documented • Successful test calls demonstrating two-way audio Please reply with a brief summary of similar Magnus, FreePBX or Asterisk deployments you’ve handled and highlight your experience securing VoIP servers.