Brother MFC 5840CN - Manual (Page 52)

BROTHER INTERNET FAX PRINTING SOFTWARE 7 - 5
NC9100h_FM6.0
The following screen shows the current configuration. To alter this
configuration, press the Configure Port... key.
From the Configure Port... dialogue box you can change the
settings.
Relay Broadcast Function
Before you can successfully use this machine as a network fax
solution you need to switch the feature “Relay Broadcasting” ON at
the machine. In addition you also need to set a “Trusted Domain” at
the machine.
In order for the machine to receive data and then send this
information (network fax) to other fax machines the “Relay Broadcast
Function” must be switched “ON”. Also you must tell the networked
machine which networks can relay faxes through your machine. This