Installation manual

256195-2201
Data commands
+CBST – Bearer type selection
Command syntax: AT+CBST= <speed>, <name>, <ce>
No data compression is provided and only asynchronous modem is supported (<name> = 0).
<speed> Description Modem type
0 (default) Autobauding None
1 300 bit/s V.21
2 1 200 bit/s V.22
3 1 200/75 bit/s V.23
4 2 400 bit/s V.22bis
5 2 400 bit/s V.26ter
6 4 800 bit/s V.32
7 9 600 bit/s V.32
8 Specific
65 300 bit/s V.110
66 1 200 bit/s V.110
68 2 400 bit/s V.110
70 4 800 bit/s V.110
71 9 600 bit/s V.110
<ce> Connection element
0 Transparent only
1(default) Non transparent only
2 Transparent preferred
3 Non transparent preferred
Application to GSM AT+CBST=7,0,1 Ask for a bearer
GSM to application OK Bearer supported
Application to GSM AT+CBST=81,0,0 Ask for a bearer
GSM to application +CME ERROR: 4 Bearer not supported
This command applies to both outgoing and incoming data calls but in a different way.
For outgoing call the two parameters (e.g. <speed> and <ce>) apply, whereas for
incoming call only the <ce> parameter applies.
Note 1) as far as incoming calls are concerned, if <ce> is set to T only and the network
proposes NT only or vice versa then the call is released.
Note 2) older values 100 and 101 for <ce> are retained for compatibility purpose but shall
not be used anymore, values 2 and 3 shall be used instead.