Elproma Elektronika Sp. z o.o.
ul. Szymanowskiego 13
05-092 Łomianki k/Warszawy
E-mail:
Tel. +48 (22) 751 76 80
www.teleorigin.com
24
9.3.
Receiving NO CARRIER message
There are some common cases when modem answers
NO CARRIER:
If data/voice/fax connection cannot be established
Right after hanging up the data/voice/fax connection
If there is no connection with network
– check antenna and registration status (see
8.8 Network registration
)
If there is no power supply (see
11.1 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 codes which can 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] or [2].
