FreePBX-Dinstar SIP Registration Fix

My Dinstar GSM gateway needs to register cleanly to FreePBX so that any call hitting the SIM in the gateway is forwarded to a MicroSIP client already registered on the same LAN. At the moment the gateway... (Budget: ₹600 - ₹1500 INR, Jobs: Asterisk PBX, Debian, Linux, Network Administration, SIP, TeamViewer, Troubleshooting, VoIP)