HP Brio 8200 Online Manual page 70

Command
ATIn Returns information about modem product codes, where n is a digit from 0 to 8.
0 - Four-digit product code.
1 - Results of poor checksum.
3 - Product type.
4 - Current modem settings.
5 - Nonvolatile memory (NVRAM) settings.
6 - Link diagnostics.
7 - Product configuration.
8 - Return the blacklisted phone numbers.
ATLn Loudspeaker volume control, where n is a digit from 0 to 3:
0 - Modem speaker disabled.
1 - Low speaker volume.
2 - Medium speaker volume.
3 - High speaker volume.
ATMn Switches speaker on or off, where n is a digit from 0 to 3:
0 - Speaker off.
1 - Speaker on until carrier detected.
2 - Speaker always on.
3 - Speaker on during handshake.
Description
Appendix AT Commands
Basic AT Commands
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