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 fax function 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.
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.
Silence Detection Threshold: Set the volume as a standard.
Drop Silent Call Timeout: Set the time to hang up the phone.