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Multi-Tech Systems GPRS (MTMMC-G) User Manual

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Chapter 11 – Data Commands  
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 
93 
 
Bearer Type Selection   +CBST 
Description:  
This command applies to both outgoing and incoming data calls, but in a different way. For an outgoing 
call, the two parameters (e.g., <speed> and <ce>) apply; whereas, for an incoming call, only the <ce> 
parameter applies. 
 
Notes:  
• 
For incoming calls, if <ce> is set to 
T, only and the network offers NT only or vice versa. Then the 
call is released.  
• 
The values 2 and 3 for the <ce> parameter are equivalent to the former values of 100 and 101. 
Those values are managed for compatibility purposes, but they should no longer be used in the 
new code (2 as former 100 and 3 as former 101). 
Values: <speed> 
 
 
0 (default) Autobauding 
(modem 
type: 
none) 
1 
300 bps  
(modem type: V.21) 
2 
1200 bps  
(modem type: V.22) 
3 
1200/75 bps  (modem type: V.23) 
4 
2400 bps  
(modem type: V.22bis) 
5 
2400 bps  
(modem type: V.26ter) 
6 
4800 bps  
(modem type: V.32) 
7 
9600 bps  
(modem type: V.32) 
8  
Specific 
12 
9600 bps  
(modem type: V.34) 
14(*) 
1400 bps  
(modem type: V.34) 
65 
300 bps  
(modem type: V.110) 
66 
1200 bps  
(modem type: V.110) 
68 
2400 bps  
(modem type: V.110) 
70 
4800 bps  
(modem type: V.110) 
71 
9600 bps  
(modem type: V.110) 
75(*) 
14400 bps (modem type: V.110) 
(*) This speed configures data and fax 14.4 kbps bearers. 
<name>   No data compression is provided and only asynchronous modem is supported (<name> = 0). 
<ce>         Connection element 
0  
Transparent only 
1 (default)  
Non transparent only 
2  
Transparent preferred 
3  
Non transparent preferred 
Syntax: 
Command syntax:   AT+CBST= <speed>, <name>, <ce> 
Command 
Possible responses
AT+CBST=? 
Note: Test command 
+CBST: (0-8,65,66,68,70,71),(0),(0-3) 
OK 
Note: Data 14,4 kbps not supported 
AT+CBST=? 
Note: Test command 
+CBST: (0-
8,12,14,65,66,68,70,71,75),(0),(0-3) 
OK 
Note: Data 14,4 kbps not supported 
AT+CBST=7,0,1 
Note: Ask for a bearer 
OK 
Note: Bearer supported 
AT+CBST? 
 
Note: Current values 
+CBST:7,0,1 
OK 
Note: Command valid 
AT+CBST=81,0,0 
Note: Ask for a bearer 
+CME ERROR: 4 
Note: Bearer not supported