Voice Gateway 4FXS User Manual
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5.1.2 Port Settings
Only accept SIP server message: It opens by default and refuses to accept illegal SIP
messages from not a SIP server. Turn off this function if you need to make the device
FXO port jumper.
5.3 System Maitainence
System Maitainence cover authority management, software upgrading, data backup
upgrading, factory setting restoration, etc.
With the help of this functions, it is very easy to manage and back up device rights,
and to upgrade device settings and replace software for device.