Lenovo ThinkPad T420 (English) User Guide - Page 70
Command format, Enter, Examples: ATL[Ent
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Command format All commands except 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: ATL[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 Command Description Z Reset to default configuration +FCLASS Select Active Service Class Syntax Z +FCLASS= +VCID Caller ID +VCID= +VRID Report Retrieved Caller ID +VRID= \N Operating Mode \N Values 0: Select Data Mode 1: Select Facsimile Class 1 Mode 1.0: Select Facsimile Class 1.0 Mode 8: Select Voice Mode 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. 0: Reports Caller ID with formatted presentation to the DTE. 1: Reports Caller ID with unformatted presentation to the DTE. 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 52 User Guide