Major improvements:
1. COMPREHENSIVE OPNsense/pfSense Guide
- Complete network topology (LAN 192.168.1.0/24 + VLANs 20/30/40)
- Step-by-step firewall rules for VLAN isolation
- Detailed port forwarding tables (WAN → COTURN/Asterisk)
- Visual flow diagrams for cross-VLAN communication
- Testing procedures for TURN/COTURN validation
- All rules properly ordered (Allow specific → Block general)
2. Enhanced COTURN Configuration
- Auto-detects and binds to local IP (listening-ip/relay-ip)
- Configured for OPNsense/VLAN environments
- Added TLS support on port 5349
- Proper relay port range (49152-65535)
- Optimized for NAT traversal
3. Asterisk Auto-Configuration
- Added ice_support=yes to all transports (UDP/TCP/TLS)
- rtp.conf auto-configures with COTURN when enabled
- Automatic TURN credentials injection
- Falls back to Google STUN when COTURN not configured
- No manual editing required
4. Baresip Auto-Configuration
- Automatically injects TURN server configuration
- Uses COTURN credentials when available
- Zero manual configuration needed
AUTOMATION: All configurations now handle themselves automatically.
Nothing requires manual editing/configuration/starting by hand.
Fixes foggy instructions, replaces with crystal-clear OPNsense guide.