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Introduction
to
Modem
Operation
7
BUSY
NO ANSWER
ing the
dial
sequence. This
result
code
will
only
appear
if
X2,
X4
or the
W
com-
mand
have
been
selected.
The
modem
has detected
a
busy
signal.
This
result
code
will
only
appear
if
the
X3, X4,
or
@
commands
have been
selected.
The number
dialed
was
not
answered. This
result
code
will
only
appear
if
the
@
command
has
been
used
in
dialing.
Result
Code
Notes
The
NO ANSWER
result
code
appears only
when
the
mo-
dem
is
dialed using the
@
command.
See
Section
4.7.
VO
and
VI
are the
modem
commands
that
determine
whether
the
modem
is
to
render numeric
or verbal
result
codes,
respectively,
The
Q
command
determines
whether
or not
results
are
sent.
In the default
state,
the
modem
returns only
Codes
0-4.
RING
only
indicates that
the
phone
is
ringing.
The
modem
does not answer
it
unless
commanded
to
or unless
auto-
answer
is
enabled.
NO
CARRIER
is
displayed
if
the
carrier signal
from
the
other
modem
is
not detected
for
a
sufficient
length of
time.
NO
CARRIER
means
that a
data
call
was
not
suc-
cessfully
completed.
4-7
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