Modem User Manual

Chapter 4 – Voice Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 127
OK The DCE agrees.
AT+VIT=0; The DTE selects Data mode/Command mode with
+VPR=0; autobauding, and disables automatic DCE answering. The +FCLASS=0; DCE
waits for a phone call (not necessarily in Data mode).
S0=0
AT+FCLASS=8; The DCE switches to Voice mode. The DCE selects a fixed
DTE/DCEAT+VIT=60;
AT+VPR=16; Interface Rate. The DTE knows from the sample rate selected earlier and the bits
per sample that the DTE/DCE Interface Rate should be 38400 baud. The
DTE/DCE Inactivity Timer starts with a value of 60 seconds.
OK The DCE agrees (at the old DTE/DCE Interface Rate).
<DLE> <R> The DCE selects another ring (at 38400 bps).
AT+VLS=2 The DCE answers the phone.
OK The DCE indicates that it is in Voice Command mode.
AT+VTX The DTE selects Voice Transmit mode.
CONNECT The DCE agrees.
<Data> The DTE plays the welcome message.
<DLE> <ETX> The DTE indicates the end of the data stream.
OK The DCE indicates that it is in Voice Command mode.
AT+VTS= {933, 0, 12} The DTE annotates the greeting message with a 1.2 sec. beep.
OK The DCE is ready for another Voice command.
AT+VSM=132, 7200, 0, 0 The DTE selects a low bit compression scheme to save disk space.
OK The DCE agrees.
AT+VRX The DTE selects the Voice Receive mode.
CONNECT The DCE agrees.
<Data> The DCE delivers <DLE> shielded and silence-compressed voice data across
the DTE/DCE interface.
<DLE> <NUL> The DTE strokes the Inactivity Timer.
<DLE> </> The DCE reports the start of a possible DTMF tone.
<DLE> <5> <DLE> <5> The DCE reports a DTMF 5 detection for 140 milliseconds (within a 70
millisecond resolution).
<DLE> <-> The DCE reports the end of the DTMF 5 detection. For this example, DTMF 5
means "finish with the voice message, and switch to fax mode".
<DLE> <!> The DTE wishes to end the record by sending an abort command.
<DLE> <ETX> The DCE indicates the end of the Voice data stream, and returns to Voice
Command mode.
AT+VNH=1 The DTE selects to disable automatic hang-ups while in Service Class 2 +VIT=0
(+FSK command result codes in Telco on-hook). The DTE switches the
+FCLASS=2 DCE to Service Class 2 fax mode.
OK The DCE agrees.
ATA The DCE starts the fax receive process.