Lucent Technologies Host-Based Controller Modem AT Data Addendum page 55

Data Addendum
June 15, 1998
AT Voice Commands Reference (continued)
Example # 8: Call screening & recording a message with TAD—using the wave driver to transmit and
receive voice samples
The TAD application is loaded. The modem is initially idle, in data mode (+FCLASS=0).
Command
RING
AT+FCLASS=8
OK
AT+VGT=128
OK
AT+VSD=128,0
OK
AT+VSM=129,8000
OK
<DLE>-R
AT+VLS=1
OK
The TAD next plays its greeting message, issues a beep, and records the caller's message.
The Application may transmit voice samples using the wave driver. The application may issue
WAVE_OUT_OPEN and WAVE_OUT_WRITE messages to the wave driver.
At the end of the greeting message the application may issue the WAVE_OUT_STOP message to the wave
driver.
AT+VTS=[933,0,120]
OK
The Application may receive voice samples using the wave driver. The application may issue
WAVE_IN_OPEN and WAVE_IN_START messages to the wave driver.
AT+VSD=128,50
of
OK
AT+VLS=5
OK
The caller leaves a message, and hangs up. The modem detects silence for a specified period of time,
and then notifies the DTE.
<DLE>-s
At the end of the message the application may issue the WAVE_IN_STOP message to the wave driver.
ATH
OK
Version 1.0
Description
DCE reports ringing from remote station.
The modem enters voice mode.
DCE responds.
Set speaker volume to normal.
DCE responds.
DTE selects normal silence detection sensitivity, and a silence detection interval
of 0 seconds. Disable silence detection.
DCE responds.
DTE selects 16-bit linear voice compression with 8.0 kHz sampling rate.
DCE responds.
DCE detects another ring, and notifies DTE.
The modem answers call.
DCE is off-hook
DTE annotates greeting message with a 1.2 second beep.
DCE responds.
DTE selects normal silence detection sensitivity and a silence detection interval
5 seconds. Enable silence detection.
DCE responds.
Speaker is attached to system, and modem is off-hook.
DCE is off-hook
DCE issues presumed end of message after silence detection interval has
elapsed.
DTE issues standard command to terminate call. DCE goes on-hook,
speaker and microphone are detached from system, and modem returns to
data mode (+FCLASS=0).
Lucent Technologies Inc.
Host-Based Controller Modem
DCE response.
AT Command Set
55