Lenovo ThinkPad T420 4236 User Manual page 70

Command format
All commands except A/ A/ A/ must begin with the prefix AT, followed by the command letter, and must end with
the Enter key. Spaces are allowed in the command string to increase readability, but the modem ignores
them while executing a command. All commands may be typed in either uppercase or lowercase, but not in
mixed case. A command issued without a parameter is considered to have parameter "0".
Examples: A A A TL[Ent TL[Ent er] er]
TL[Ent er]
This command causes your modem to lower the volume from its speaker.
Refer to the following tables of AT commands and extended AT commands.
Table 3. Modem command list
Description
Command
Z Z Z Reset to default
configuration
+FCLASS +FCLASS +FCLASS Select Active Service
Class
+VCID +VCID +VCID Caller ID
+VRID
+VRID +VRID Report Retrieved Caller ID
\N \N \N Operating Mode
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User Guide
Syntax
Z Z Z
+F +F +FCL CL CLAS AS ASS S S =<Mode>
+VCID ID ID=<pmode>
+VC +VC
+VRID +VRID=<pmode> +VRID
\N \N \N<mode>
Values
<Mode>
0: Select Data Mode
1: Select Facsimile Class 1
Mode
1.0: Select Facsimile Class 1.0
Mode
8: Select Voice Mode
<pmode>
0: Disable Caller ID reporting
1: Enables Caller ID with
formatted presentation to the
DTE.
2: Enables Caller ID with
unformatted presentation to the
DTE.
<pmode>
0: Reports Caller ID with
formatted presentation to the
DTE.
1: Reports Caller ID with
unformatted presentation to the
DTE.
<mode>
0: Selects normal speed
buffered mode (disables
error-correction mode)
and forces &Q6 (selects
asynchronous operation in
normal mode.)
1: Same as 0.
2: Selects reliable (error
correction) mode and forces
&Q5 (the modem will try to
negotiate an error corrected
link). The modem will first