Nokia 30 GSM Connectivity Terminal At Command Manual page 111

Required air interface user
rate
9600
14400
19200
28800
43200
Required air interface user
rate
9600
14400
19200
28800
43200
Connection Type
v.110
AT+CBST=81,0,1;+CHSN=1,0,0,0
AT+CBST=81,0,1;+CHSN=2,0,0,0
AT+CBST=81,0,1;+CHSN=3,0,0,0
AT+CBST=81,0,1;+CHSN=4,0,0,0
AT+CBST=81,0,1;+CHSN=6,0,0,0
Connection Type
v.120
AT+CBST=51,0,1;+CHSN=1,0,0,0
AT+CBST=51,0,1;+CHSN=2,0,0,0
AT+CBST=51,0,1;+CHSN=3,0,0,0
AT+CBST=51,0,1;+CHSN=4,0,0,0
AT+CBST=51,0,1;+CHSN=6,0,0,0
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