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SmartVoice Gateway(s) User Guide 41
YML832 Rev2
Fax Settings
•T.38: The T.38 protocol is used for better and faster facsimile transmission. So it is recommended
to enable this function to gain better fax quality. When this function is enabled, please select UDP or
TCP. If selecting TCP and some gateways cannot use the Fax function, please select UDP instead.
NOTE: When a FAX tone is detected in a call, the gateway will automatically switch
from voice mode to fax mode. So fax settings will be temporarily applied to a
specific port which detects fax tones, instead of its voice settings.
•Enable High Quality: The system sends the same FAX frame twice to get a high quality of the FAX.
It requires more bandwidth.
•T.30: The system uses T.30 as the protocol for fax transmission. The parameter settings are the
same as for voice transmission. However, enabling the T.30 will consume more network resources
and will affect transmission quality.
• FAX Detect sensitivity: Used to adjust the sensitivity of detection as to whether a phone call is a
FAX or not.
NOTE: When you send fax over an IP network it needs your network to support
fax over IP function (either T.38 or T.30). Please consult your VoIP provider for this
setting.
This is used as a standard to determine whether or not to hang up the phone. The system will hang up
the phone automatically to avoid keeping the line engaged if the detected volume is below the Silence
Detection Threshold and the time exceeds the Drop Silent Call Timeout.