Canon Color imageRUNNER C3480 Sending And Facsimile Manual Sending And Facsimile Manual page 286

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Selecting the Line for Sending
<Line 2>:
[Priority TX]: Sends with line 2 if this line is not in use or sends with line 1 if line 2
is in use.
[Prohibit TX]: Prohibits sending with line 2. (Line 2 is only used for receiving.)
Documents are always sent with line 1. If line 1 is in use, the
machine waits to send the document.
IMPORTANT
Even if you set to prohibit using line 1 for sending document, line 1 is still used for
manual sending.