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Chapter 4 – Voice Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 108
Command: +VRX Enter Voice Receive State
Values: 0, 1, 2–127, 128–255
Result Codes: Values (above) if the modem accepts the command; ERROR if the modem is not
connected to an off-hook Telco line, or one non-Telco input device.
Description: +VRX causes the modem to start the voice reception process. The modem starts the
process by returning the CONNECT result code to the PC. The modem then sends
shielded voice data to the PC, in the format previously selected by the +VSM command.
The modem exits the voice/receive state by one of two means: a <DLE><I>, and an
Inactivity Timer timeout. During the voice receive, the modem informs the PC of pertinent
events, such as Presumed End of Message (Quiet), and Presumed Hang Up (Silence)
detected, Busy detected, and Dial Tone detected, so that at the discretion of the PC, the
PC may terminate the voice receive state. On termination of the voice receive state, the
modem returns the OK result code, and then returns to the Voice Command state.
The Inactivity Timer is in effect during the receive operation. If the PC uses this timer and
stops the modem from performing unwanted restarts, the PC must assure that there is
data sent from the PC to the modem often enough to refresh the timer.
+VRX=0 Voice receive operation. This selection does not provide for modem
periodical tone production during a voice receive operation. The PC must
issue the proper notifications of a record operation in progress by
message playbacks to satisfy possible legal requirements.
+VRX=1 Voice receive operation. This selection does not provide for modem
periodical tone production during a voice-receive operation. The tone
frequency and cadence is manufacturer specific.
+VRX=2–127 Reserved for future specification.
+VRX=128–255 Manufacturer specific.
The result code values (0, 1, 2–127, 128–255) are returned if the modem accepts the
command. The ERROR result code is returned if the modem is not connected to an off-
hook Telco line, or one non-Telco input device.
Command: +VTS=<string> Produce DTMF and Tone Generation in Voice Mode
Values: Refer to the IS-101 Spec.
Default: Refer to the IS-101 Spec.
Result Codes: Refer to the IS-101 Spec.
Description: The +VTS command causes the modem to produce DTMF tones, single-frequency tones,
and optionally, double-frequency tones. This command allows the PC to generate a dial
tone, busy, etc. for those modems capable of generating two arbitrary tones. The modem
may perform tone detection during the playing of tones. When the modem receives the
signal <DLE><!> to abort playing of the tones, the result code OK is displayed, and the
modem returns to the voice command state.
The Inactivity Timer is in effect during the receive operation. If the PC uses this timer and
stops the modem from performing unwanted restarts, the PC must assure that there is
data sent from the PC to the modem often enough to refresh the timer.
Modem support for the second tone generation is optional. The modem produces
compliant DTMF tones when processing DTMF tone production codes.
The tone generation string consists of elements in a list where each element is separated
by commas. Each element can be:
1. A single ASCII character in the set of 0–9, #, *, and A–D
2. A string enclosed in square brackets [ ] , or
3. A string enclosed in curly braces { }
The modem interprets item 1 as a DTMF digit with duration set by the +VTD command.
The modem interprets item 2 as a general dual tone and duration selection. The modem
interprets item 3 as a DTMF tone with a different duration than that given by the +VTD
command.