Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 197)

AN93
Rev. 1.3 197
Table 120. Handset Configuration
Host to Modem Commands / Data
Modem to Host
Result Codes/
Data
Local Modem Actions
AT:U199|A OK
Mute the microphone and speaker paths to
the codec.
AT+VLS=0 OK
Disable voice mode. Used as a transition
point between non-zero +VLS voice modes.
AT+VLS=13 OK
Setup off-hook voice mode. See Table 117
on page 190 for details.
AT:U0B1,0500 OK Restore Si3000-to-DAA transmit gain path.
AT:U0B5,0200 OK Restore DAA-to-Si3000 receive gain path.
AT:U72,0110 OK
Configure Si3000 Register 1:
Enable speaker driver
Disable line output driver
Disable telephone instrument driver
Enable MBIAS output
AT:U72,05B3 OK
Configure Si3000 Register 5:
10 dB Line In gain
Mute Line In
20 dB MIC input gain
Enable MIC input
Mute telephone instrument input
Enable IIR filter
AT:U72,065C OK
Configure Si3000 Register 6:
0 dB RX PGA gain
Disable Line Out
Disable telephone instrument output
AT:U72,075E OK
Configure Si3000 Register 7:
0 dB RX PGA gain
Enable SPKRL
Mute SPKRR
AT:U72,0900 OK
Configure Si3000 Register 9:
0 dB Line Out attenuation
0 dB Speaker output attenuation
AT+VSP=0 OK
Select handset voice path. See Figure 29 on
page 188 for details.
AT:U199&FFF5 OK
Enable the microphone and speaker paths
to the codec.