FXS Setting:
The FXS line setting includes each line number and SIP proxy settings.
Line ID: FXS line (T1 to T4)
State: The line is active or not
TEL No: The telephone number
Hotline TEL: If hot line is set, this field shows the hot line number.
FXS line>
User ID: FXS Line number (T1 to T4)
User Type: The line type, FXO or FXS
Line State: Set to active if you would like to use this line. Otherwise,
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