Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 209)

AN93
Rev. 1.3 209
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><ETX> OK
Terminate the transmit operation. The
modem will respond with OK to denote the
return to command mode.
AT+VSM=131 OK
Select G.726 ADPCM, 4-bit, 32 kbps for-
mat.
AT+VTS=[1000,0,100] OK Play user record tone prompt.
AT:U0B5,0200 OK
Restore DAA-to-Si3000 receive gain path.
This will allow call screening of the ICM.
AT:U199&FFF7 OK
Enable speaker for call screening of the
ICM.
AT+VRX CONNECT
Trigger receive operation. The first byte
after the newline character following the
CONNECT message will be the first data
stream byte.
[Voice Stream]
Receive ICM voice stream. During voice
stream capture, the user can adjust the
UBF value via the <DLE><u> and
<DLE><d> commands. The host voice
driver will need track the number of adjust-
ments and update the +VGR value for
future use.
<DLE><!>
<DLE><ETX>
OK
Terminate the receive operation. The
modem will respond with <DLE><ETX> to
mark the end of the data stream. The OK
denotes the return to command mode. A
loss of loop current, parallel phone detect,
timeout, or silence event can trigger the
<DLE><!> transmission.
Table 131. TAM PSTN Normal Answer – OGM Playback with ICM Record (Continued)