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 

 

 

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

 

 

 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