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qualifies as a ring signal is determined by country-dependent parameters, modifiable
through the Product Configuration File.
When cellular interface is selected, RING indicates that the cellular phone is receiving an
incoming call.
NO CARRIER (3)
The modem sends this result code when an attempt o establish a connection fails or an
established connection has been terminated
Under X0, if busy tone detection is enforced, this result code is used as a response to
the detection of busy or circuit busy.
Under X0, if dial tone detection is enforced or selected, this result code indicates that
dial tone has not been detected.
ERROR (4)
The modem returns this result code if the command is not recognized (e.g., the
command line has a syntax error or the command is not supported), the command line
maximum length is exceeded, a parameter value is invalid, or other problem with
processing the command line is detected.
Under X0, X1, X2, and X3, this result is used instead of DELAYED and BLACKLISTED.
NO DIALTONE (6)
For X2 and X4, the modem sends this result code if it has been instructed to wait for dial
tone during dialing but none is received.
When cellular phone interface is selected, NO DIALTONE indicates that cellular service
is not currently available.
BUSY (7)
For X3 and X4, if busy tone detection is enforced, the modem sends this result code
when attempting to originate a call if the busy (engaged) signal is detected on the line.
NO ANSWER (8)
The modem sends this result code when:
1. Attempting to originate a call if a continuous ringback signal is detected on the line
until the expiration of the timer S7.
2. "@" (Wait for Quiet Answer) dial modifier was used, but remote ringing followed by
five seconds of silence was not detected before expiration of the connection timer (S7)
DELAYED (24)
For X4, the modem returns this result code when a call fails to connect and the number
dialed is considered 'delayed' due to country blacklisting requirements.
BLACKLISTED (32)
For X4, the modem returns this result code when a call fails to connect and the number
dialed is considered 'blacklisted'.
FAX (33)
The modem returns this result code when a fax modem connection is established in a
facsimile mode.
DATA (35)
The modem returns this result code when a data modem connection is established in a
facsimile mode.
+FCERROR (+F4)
This message is sent to the DTE when high speed fax data (V.27, V.29, V.33, or V.17) is
expected and a V.21 signal is received.
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