Brother MFC-J3540DW Online User's Manual page 230

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Send Tone Signals
If you have a Pulse dialling service, but must send Tone signals (for example, for telephone banking), follow
these steps. If you have a Touch Tone service, you will not need this feature to send tone signals.
1. Press
[Fax].
If [Fax Preview] is set to [On], press [Fax] > [Sending Faxes].
2. Press [Hook].
3. Press # using the dial pad. Any digits dialled after this will send tone signals.
When you are finished with the call, the machine will return to the Pulse dialling service.
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