User`s manual

AT Command Reference Manual

1048 7-23

#VTD - DTMF Tone Reporting

This command queries and controls which types of tones can be detected and reported to the DTE via shielded codes in

Voice Transmit, Voice Receive, and Online Voice Command Modes.

Parameters: i, j, k (three ASCII hexadecimal bit maps)

Default: 3F, 3F, 3F

Result Codes:

OK If bits supported with #VTD=? are selected.

ERROR Otherwise.

Command options:

#VTD? Returns the current setting of the #VTD command as an ASCII decimal value in result code

format.

#VTD=? Returns the tone reporting capabilities of the modem.

#VTD=i,j,k Where i,j,k corresponds (in ASCII hexadecimal) to the desired capabilities, as shown in Table 7-6,

for Voice Transmit, Voice Receive, and Online Voice Command Modes, respectively.

Table 7-6. #VTD Tone Detection/Reporting Bit Settings

Bit Description

0 0 = Disable DTMF tone capability;

1 = Enable DTMF tone capability

1 0 = Disable V.25 1300 Hz Calling tone capability;

1 = Enable V.25 1300 Hz Calling tone capability

2 0 = Disable T.30 1100 Hz Facsimile Calling tone capability;

1 = Enable T.30 1100 Hz Facsimile Calling tone capability

3 0 = Disable V.25/T.30 2100 Hz Answer tone capability;

1 = Enable V.25/T.30 2100 Hz Answer tone capability

4 0 = Disable Bell 2225 Hz Answer tone capability;

1 = Enable Bell 2225 Hz Answer tone capability

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

6-7 Reserved.

Notes:

1. The modem detects this tone/cadence, and reports it via a shielded code to the DTE.

2. Tone detection is only performed when the sampling rate is 7.2 kHz (see the #VSR

command).