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11.7.3 183(Session Progress)-->[It means"on progressing"] : When
you turn 183 on, it means you can hear voicemail while GMS side are
busying. We recommend you to turn this on if you use SIP Proxy.
11.8 Other Settings
You could setup the RFC and QoS according to your ISP information.
After setting, remember to click the Submit button.
The QoS setting is to set the voice packets’ priority. If you set the value
higher than 0, then the voice packets get the higher priority to the
Internet. But the QoS function still need to cooperate with the others
Internet devices.