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.
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 and
commands. The host voice
driver will need track the number of adjust-
ments and update the +VGT value for
future use.
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 and
commands. The host voice
driver will need track the number of adjust-
ments and update the +VGR value for
future use.
OK
Terminate the receive operation. The
modem will respond with 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
transmission.
Table 131. TAM PSTN Normal Answer – OGM Playback with ICM Record (Continued)