Teleorigin RB600, User Manual

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8.3 Receiving NO CARRIER message
There are some common cases when modem answers NO CARRIER:

If a data/voice/fax connection cannot be established

Right after hanging up the data/voice/fax connection

If there is no connection with a network – check antenna and registration status
(see
Network registration )

If there is no power supply (see Power supply)
If modem answers NO CARRIER in some cases, you can have extended error code
using AT+CEER. The table below shows some of the codes which may appear.
Error code Description
1 Unassigned or unallocated number
3 No route to destination
6 Channel unacceptable
8 Operator determined barring
16 Normal call clearing
17 User busy
18
No user responding
19 User alerting, no answer
21 Call rejected
22 Number changed
27 Destination out of order
28 Invalid number format (incomplete number)
34 No circuit/channel available
38 Network out of order
41 Temporary failure
For further information about AT commands and their usage, refer to [1].
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