Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 211)

AN93
Rev. 1.3 211
AT+VGT=128 OK
Set the RS232-to-DAA transmit gain regis-
ter (UB3) for TAM PSTN.
AT+VSD=129 OK
Set sensitivity level for ICM recording
silence detection.
AT+VSM=4 OK
Select G.711U
-law PCM, 8-bit, 64 kbps
format. The voice driver will need to track
the OGM format with the OGM PCM file.
AT+VLS=0 OK
Disable voice mode. Used as a transition
point between non-zero +VLS voice
modes.
AT+VLS=15 OK
Setup off-hook voice to PSTN. See
Table 117 on page 190
for details.
AT+VTX CONNECT Trigger transmit operation.
<DLE><u>
TX Underrun. Appears at the start of +VTX
before transmit data are seen.
[Voice Stream]
Transmit OGM voice stream. During voice
stream capture, the user can adjust the
UB3 value via the <DLE><u> and
<DLE><d> commands. The host voice
driver will need track the number of adjust-
ments and update the +VGT value for
future use.
<DLE><~>
<DLE><1>
<DLE></>
DTMF 1 digit detected.
<DLE><~>
<DLE><2>
<DLE></>
DTMF 2 digit detected.
<DLE><~>
<DLE><3>
<DLE></>
DTMF 3 digit detected.
<DLE><~>
<DLE><4>
<DLE></>
DTMF 4 digit detected. The password of
1234 has been matched. Abort answer
sequence.
<DLE><ETX> OK
Terminate the transmit operation. The
modem will respond with OK to denote the
return to command mode.
Table 132. TAM PSTN Interrupted Answer – OGM Playback with DTMF Menu Entry (Continued)
Host to Modem Commands / Data
Modem to Host Result
Codes/Data
Local Modem Actions