Planet Technology BT-510U - Manual (Page 147)

2. Select the [Device] tab, right-click on the modem you wish to use,
and then click on [Properties] .
3. Select the [Send] tab, and then confirm that "Enable device to
send" has been checked.
4. Select the [Receive] tab, and then confirm that "Enable device to
receive" has been checked when you wish to receive faxes).
147