ASIC Offloading & VoIP Quality Issues

Problem Description

Real-time VoIP applications (Discord, Teams, Zoom) exhibit high latency (>200ms) and packet loss, forcing a fallback to low-quality TCP relays. Audio input appears "damped," robotic, or near-silent to other participants, despite sounding perfect in local monitoring or DAW software.

Fix

1. Disable Hardware Offloading: Prevents the NPU from dropping fragmented UDP return traffic.

2. Enable Fixed Port: Forces the firewall to use the same internal source port for the external connection, allowing the upstream router to maintain the session.

config firewall policy
    edit <POLICY_ID>
        # Force traffic to main CPU (Software Processing)
        set auto-asic-offload disable
        set np-acceleration disable

        # Prevent Port Translation
        set nat enable
        set fixedport enable

        # Disable Deep Inspection for Real-Time Traffic
        set utm-status disable
        set ssl-ssh-profile "no-inspection"
    next
end

After applying, clear active sessions to force a fresh handshake

diagnose sys session filter dport 50000 65535
diagnose sys session clear