LevelOne VOI-7100 - Manual (Page 49)

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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.