User`s guide

ADSL/VoIP Gateway User’s Guide
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The following table gives the range of values for each option
which can be specified with this command and a default value
(if applicable):
Figure 100: PSTN rules details
Quality of Service (QoS) Settings
QoS (Quality of Service) is used to ensure voice calls are at a
higher priority than traffic routed between the LAN/WLAN and
DSL interface.
Figure 101: . Quality of Service
The voice software generates packets with the transmit priority
of the data buffer set to 7 (the default, best effort, priority is 0).