Panasonic Panafax UF-311 - Manual (Page 69)

Checking the
Telephone line
When you do not hear a dia) tone through the telephone connected
to the machine or when the telephone does not ring (No automatic
receive).
(a) Unplug the Telephone Line Cord from the telephone jack that
was supplied by the telephone company.
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(b) Plug a different regular telephone into the telephone jack that
was supplied by the telephone company.
(c) Check for dial tone through the handset. If there is still no dial
tone, report it to your local telephone company.
Call from another telephone to this number. If the telephone
does not ring, report it to your local telephone company.