Welltech FXS SIP Gateway V.2.9 - Manual (Page 70)

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FXS Gateway Overview
LABEL DESCRIPTION
options from the drop-down list box.
OK [button] Click [OK] button to save your changes back to the FXS Gateway
volatile memory.
Note:
Most of all, the Rom file needed to get upgrade is App or Boot2m. Please check
the exactly Rom file before doing download procedure.