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Cisco DPC 3925 Model blocking outbound Video UDP traffic

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Cisco DPC 3925 Model blocking outbound Video UDP traffic

Hi - Im using Cisco DPC 3925 Cable modem. Ive recently installed a company video conferance system and notice that Starthub is dropping all outgoing UDP packets. Incoming video is fine but outgoing video is seeing almost 100% packet loss. I believe the issue is with the DPC 3925. I use it in bridged mode with my ASUS router. I have also tried to use DPC 3925 in router mode - switched off the SPI firewall and connected directly but experience the same issue. 

 

My colleagues who are using Fibre broadband are not experiencing this issue.

 

Appreciate any advice.