AT+CBST= 7,0,1 (V.32 9.6k, non transparent) - Not supported
AT+CBST=12,0,1 (V.34 9.6k, non transparent)) - Not supported
AT+CBST=39,0,1 (V.120 9.6k, non transparent) - Not supported
AT+CBST=71,0,1 (V.110 9.6k, non transparent) - Not supported
AT+CBST= 7,0,0 (V32 9.6k, transparent) - Not supported
AT+CBST=12,0,0 (V34 9.6k, transparent) - Not supported
AT+CBST=14,0,0 (V34 14.4k, transparent) - Not supported