TA Triumph-Adler 2256 - Manual (Page 124)

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Fax Settings > Transmission Restriction
5 Press the [ OK ] key.
6 Press the [ ▲ ] or [ ▼ ] key to select [Unknown Number RX].
7 Press the [ OK ] key.
2
Configure the function.
1 Press the [ ▲ ] or [ ▼ ] key to select [Reject] or [Permit].
2 Press the [ OK ] key.
To receive faxes from the unknown number, select [Permit]. To reject faxes from the unknown
number, select [Reject].