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Voice Commands for the MT5656ZDXV and MT5600ZDXV Modems

Multi-Tech Systems, Inc. Commands Reference Guide (PN S000273D)

Voice Sample Sessions

This section provides Voice mode send and receive handshaking examples.

Suggested Compression Method and Sample Rate Selection

Command Response

AT+VSM=? The PC inquires about the compression methods and bits-per-sample options.

The modem reports three compression methods:

• PCM, twelve bits per sample, timing marks, sampling rates of 7200-8000 and 11025,

three levels of silence compression sensitivity, and silence clip to 0.5 seconds.

• The same as 1 above, but without silence compression.

• ADPCM, two bits per sample, timing marks, sampling rate of 7200, no silence

compression, and no silence clip.

128, "SIGNED PCM", 12, 40, (7200-8000, 11025), (127-129), (0-50)

129, "SIGNED PCM", 12, 0, (7200-8000, 11025), (0), (0)

132, "ADPCM/AQ", 2, 40, (7200), (0), (0)

AT+VSM=128 The PC selects the first compression method with the intent of queying the event detection

capabilities of the modem.

OK The modem agrees.

AT+VEM=? Checks the modem event detection capability for the first compression method.

"C" The modem reports Service Level C.

0A000100

0E601800

1A803840

AT+VSM=132 Selects the second compression method with the intent of querying the event detection

capabilities of the modem.

OK The modem agrees.

AT+VEM=? Checks the modem event detection capability for the second compression method.

"B" The modem reports Service Level B.

0A000100

04600000

1A803040

AT+VLS? The modem inquires about what analog source and destinations are available.

The modem reports that a microphone and speaker are available:

0, " ", 0A000100, 0E601800, 1A803840

1, " T", 0A000100, 0E601800, 1A803840

4, " S", 0A000100, 0E601800, 1A803840

6, " M", 0A000100, 0E601800, 1A803840

AT+VSD=? The modem inquires about what end-of-voice receive silence detection capabilities are available.

(127-129), (50-200)

The modem reports three levels of sensitivity and a time interval between 5.0 and 20.0 seconds.

Later, to transmit or receive a voice message, the PC selects:

• The first compression method at 7200 sampling rate, enable silence compression with

nominal silence sensitivity, and no silence clipping.

• Report all modem-supported event detection.

• Set end of receive silence detection at nominal silence sensitivity setting and for 5.0

seconds: AT+VSM=128, 7200, 128, 0; +VEM=FFFFFFFF8; +VSD=128, 50

OK The modem agrees.

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