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improvement of the packet loss ratio. This parameter is used to mark the specified QoS label for the
voice packet to increase the network service quality.
Note: For details about media encryption and media NAT penetration, refer to 3.5.6 Firewall penetration.
3.5.5 Voice Coding and Sequence
This parameter is used to modify the compression coding according to the requirements of the
service provider.
If a compression coding is ticked, it indicates that the compression coding is available. The UP
and DOWN are used to adjust the priority of the selected voice compression coding.
3.5.6 Firewall Penetration
In the advance option of the call setting, the signaling and media have separate firewall setting,
as shown in the following figures.
3.5.6.1 Traversal of H323 Signaling over NAT
The traversal of H323 signaling over NAT (firewall) is classified into 4 categories: