In
V.34+ mode (33.6Kbps) the modem is unstable when
it switches to Dial-backup mode and hangs up. The
remote modem doesn't detect line disconnection.
There are two setting
items in Line Setup menu: "Dial to Leased" and "Leased to
Dial". Both settings have to follow "Auto" or "Manual" at
the same time, i.e. if you setup the "Leased to
Dial" to "Auto", then the "Dial
to Leased" should also be "Auto". Otherwise,
the remote modem will not register the disconnection
until after the 45-second timed out period.
