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LT Modem AT Commands:

I3  - displays driver revision
I9  - displays Country setting (Changed by Windows' Dialing Properties)
I11 - displays current (or last) call rate & diagnostic info
    (Note - With Windows98 and some driver versions, you will not be able to view data in I11 after a DUNs session; you'll have to use a terminal program (HyperTerminal) to place a call to see valid diagnostic data.

-V90=# where # can be any of the following to control the V90 downstream rate:
0  V.90 disabled
1 Auto Rate (default)
2 28000          3 29333            4 30666
5 32000          6 33333            7 34666
8 36000          9 37333           10 38666
11 40000         12 41333           13 42666
14 44000         15 45333           16 46666
17 48000         18 49333           19 50666
20 52000         21 53333           *22 54666  
23 56000*   
* 22 & 23 valid only with 5.49(+) driver

S38=#  where # disables or selects the KFlex downstream rate:

0 - disable KFlex (will force V90 -or- v.34 connection)
1 - Auto Rate (default)
2 - 32k            3 - 34k            4 - 36k
5 - 38k            6 - 40k            7 - 42k
8 - 44k            9 - 46k           10 - 48k
11- 50k           12 - 52k           13 - 54k

s37=#  where # controls the upstream rate:

0 - Maximum (default)
3 - 300bps         5 - 1200bps        6 - 2400bps
7 - 4800bps        8 - 7200bps        9 - 9600bps
11- 14.4k         13 - 19.2k         14 - 21.6k
15- 24k           16 - 26.4k         17 - 28.8k
18- 31.2k         19 - 33.6k
 

Default \N3 allows V.42, MNP, or buffered (NoEC) mode.   To use V.42 only, the command is \N4.  Default %C1 will use V.42bis compression when V.42 error control is used.

COUNTRY SELECT:
To configure for a specific country, execute the following AT command:

%T19,0,country_code in HEX

Country_Code in HEX:

USA 19	Australia 1	Belgium 2	Denmark 3
Finland 4	France  5	Germany  6	The Netherlands 7
Italy  8	New Zealand  9	Norway   A	Spain  B
Sweden  C	Switzerland   D	UK  E	Austria  F
Japan  10	China  11	Korea  12	Malaysia  13
Singapore  14	Taiwan  15	Thailand  16	Indonesia  17
Portugal  18	Ireland  1A	Hong Kong  1B	Canada  1C
Mexico  1D	India  1E	Vietnam  1F	Philippines 20
Greece  21	Hungary  22	Turkey  23	S. Africa  24

Note - The country code determines homologation parameters - settings that determine dial-tone, ring, busy detection, etc. These parameters can be further modified with AT%21,x,y commands which are documented at page 64 of the command reference (see .pdf link below).

Other AT Commands:

The Agere site had .pdf-format 87-page Reference Manual (Host-Based Controler Modem AT Command Set). This document, also available from Modemsite downloads, includes V.90/V.42, but not V.92/V.44-related commands. Modemsite's V.92 Commands page includes information on the V.92/V.44 commands.