Motorola A840 CDMA2000 Manual page 78

Connect to the device that will receive the fax or data,
then:
1 Set your phone to receive a data or fax call (see
2 Use the application running on the device to
3 When the data or fax transfer is complete, end
76
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Action
page 92).
answer the call.
the call from the connected device to close the
connection.