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5.1.2 Result Codes
Result Codes refer to the responses of the cellular modem unit to a command.
Unless the cellular modem has been programmed to be in the Quiet mode (Section 6.1),
the unit will respond each time a command is issued. The default mode of the cellular
modem is the verbose mode. The responses in the verbose mode are characters.
Using AT commands, the modem can be put into terse (non-verbose) mode. The
responses in non-verbose mode are numerical digits.
Various modem responses are shown below:
Terse Mode Verbose Mode Description
0 OK Command executed without errors.
1 Connect Connection at 300 bps
2 Ring Ringing signal detected
3 No Carrier Carrier lost or never present
4 Error Invalid command
5 Connect 1200 Connection at 1200 bps
6 No Dial tone Cellular service not available
7 Busy Called party on-line
8 No Answer
9 Connect 0600
10 Connect 2400
11 Connect 4800
12 Connect 9600
13 Connect 7200
66 Compression class 5 Connection established MNP- 5
67 Compression V42bis
68 Not used
69 Compression none
76 Protocol: none
77 Protocol: LAPM
99 Service Unavailable Cellular Service not available
100 Service Available Unit ready for communication