Yes - fax lines can either be set to use a fixed priority or a sceduled
priority. The sceduled priority can work with different priorities around
the clock and around the week.

If you have low priority fax awating to be sent, say in the night time,
and a high priority fax is sent to the recipient in the day time a
"Bundling System" will enclose the low priority fax once the transmission
is active.