LevelOne VOI-7011 - Manual (Page 68)

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Other Settings
You can setup the Hold by RFC and QoS in this page. To
change these settings please follows your ITSP information.
The QoS is used to set the voice packet priority. Higher value
other than zero will get higher priority for the voice packets in
Internet. However, the QoS function still needs to cooperate
with the other Internet devices. SIP Expire Time depends on
your ITSP required.
Note
For more information about these advanced
features, please ask your network administrator or
service provider help desk.