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Chapter 4 - V.22bis Commands
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 45
V.22bis Result Codes
The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the form of
result codes. .
Two forms of each result code are available: long-form, an English-like "verbose" response, and short-form, a data-
like numeric response (included in parentheses following the long-form). The long-form code is preceded and
terminated by the sequence < CR> < LF>. The short-form is terminated by < CR>, only with no preceding sequence.
If result messages are suppressed, nothing is returned to the DTE. The long-form results codes can be modified by
the OEM through the .INF file.
Table of Result Code Definitions
Code Message Meaning
0 OK A command line has been executed.
1 CONNECT For X command values specifying no speed reporting, the modem has connected
to the line and either the line speed is 300 bps and line speed is enabled, or the
DTE speed is 300 bps and DTE speed reporting is enabled.
2 RING An incoming ring signal is detected on the line. What qualifies as a ring signal is
determined by country-dependent parameters, modifiable through patch code.
3 NO CARRIER Sent when attempting to establish a call if:
1. Ringback is detected and later ceases but no carrier is detected within the
period of time determined by register S7, or
2. No ringback is detected within the period of time determined by register S7.
Also sent when the modem auto-disconnects due to loss of carrier.
For X0, sent for the following conditions:
1. If busy tone detection is enforced, busy or circuit busy has been detected.
2. If dial tone detection is enforced or selected, dial tone has not been detected.
4 ERROR Sent during an attempt to execute a command line if any of the following conditions
occur:
1. The command line contains a syntax error.
2. The modem cannot execute a command contained in the command line, i.e.,
the command does not exist or is not supported.
3. A command parameter within the command line is outside the permitted range.
For X0, X1, X2, and X3, this message is sent instead of DELAYED and
BLACKLISTED.
5 CONNECT 1200 The modem has connected to the line and either the line speed is 1200 bps and
DCE speed reporting is enabled, or the DTE speed is 1200 bps and DTE speed
reporting is enabled.
6 NO DIAL TONE For X2 and X4, the modem has been instructed to wait for dial tone during dialing
but none is received.
7 BUSY For X3 and X4, if busy tone detection is enforced, the busy (engaged) signal is
detected on the line when the modem is attempting to originate a call.
8 NO ANSWER The modem is attempting to originate a call if a continuous ringback signal is
detected on the line until the expiration of the timer S7.
9 CONNECT 600 The modem has connected to the line, the DTE speed is 600 bps, and DTE speed
reporting is enabled.
10 CONNECT 2400 The modem has connected to the line and either the line speed is 2400 bps and
DCE speed reporting is enabled, or the DTE speed is 2400 bps and DTE speed
reporting is enabled.
11 CONNECT 4800 The modem has connected to the line, the DTE speed is 4800 bps and DTE speed
reporting is enabled.
12 CONNECT 9600 The modem has connected to the line, the DTE speed is 9600 bps and DTE speed
reporting is enabled.
13 CONNECT 7200 The modem has connected to the line, the DTE speed is 7200 bps and DTE speed
reporting is enabled.
14 CONNECT 12000 The modem has connected to the line the DTE speed is 12000 bps and DTE speed
reporting is enabled.
15 CONNECT 14400 The modem has connected to the line, the DTE speed is 14400 bps and DTE
speed reporting is enabled.