#VTD - Tone Detection/Reporting Bit Settings
Bit Description
0 0 = Disable DTMF tone capability;
1 = Enable DTMF tone capability (1).
1 0 = Disable V.25 1300 Hz Calling tone capability;
1 = Enable V. 25 1300 Hz Calling tone capability (1).
2 0 = Disable T.30 1100 Hz Facsimile Calling tone capability;
1 = Enable T.30 1100 Hz Facsimile Calling tone capability (1).
3 0 = Disable V.25/T.30 2100 Hz Answer tone capability;
1 = Enable V.25/ T.30 2100 Hz Answer tone capability (1).
4 0 = Disable Bell 2225 Hz Answer tone capability;
1 = Enable Bell 2225 Hz Answer tone capability (1).
5 0 = Disable call progress tone and cadence (e.g., busy and dial tone)
capability;
1 = Enable call progress tone and cadence (e.g., busy and dial tone)
capability (1).
6 Reserved.
Note: (1) The modem detects this tone/cadence, and reports it via
a shielded code to the DTE.
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