2N Wireless 3G router 2N EasyRoute_old design - User manual, 1571 v1.06 - Manual (Page 87)

FAX - ERF 4.4
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transmission you can hear the fax machine ‘beeping’. Beeping is normal; it is
a sequence of predefined T.38 tones. The Line indicator keeps shining during
the whole FAX transmission process.
6. Typically, you are informed of your FAX transmission success or failure
through a success or failure report printout.
Incoming FAX
1. The incoming fax process is even simpler. A majority of fax machines provide
automatic answering after a predefined count of rings. The device answers the
call and, if connection is established successfully, prints out the incoming
document.