Specifications

AT Command Set Reference
Ver. 1.00
GSM1308AT001 Page 216 Ver. 1.00 – 10/29/2008
4.3.4. $SPKCFG Set Downlink Voice Parameters
(continued)
Examples
AT$SPKCFG=12,5,0,0 Max gain/volume with both filters enabled.
AT$SPKCFG=12,0,0,0 Downlink voice is muted.
AT$SPKCFG=8,4,1,1 Less than optimal voice quality with both
filters disabled.