LevelOne VOI-8001 - Manual (Page 111)

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4.2.10 Save Modification
/Save Modification/
Most of the VoIP Gateway parameters will take effective after you modify, but it
is just temporary stored on RAM only, it will disappear after your reboot or
power off the VoIP Gateway, to save the parameters into Flash ROM and let it
take effective forever, please remember to press the Save Modification
button after you modify the parameters.