[SGS-6310 series] When connected to the SGS-6310 series switch, the VoIP devices are unable to function correctly due to failed UDP data transmission.

By default, UDP ports 65534 and 65535 are disabled. 

The user can enable them by entering the following commands: 

ip forward-protocol udp <<port-number>>  

For example: ip forward-protocol udp 65534

                        ip forward-protocol udp 65535

After applying the command, please verify whether the issue has been resolved.