Westermo GS-01, Installation Manual

Page: 54 / 56

54 6195-2201
8.3 The modems always return “No carrier”
when trying to issue a communication
a) After s failed attempt (no carrier”), issue
AT+CEER
to have extended error cause
b) Is the received signal strong enough?
Use AT+CSQ commands to check that the signal is strong enough to establish
a connection.
• 1–10 Could be insufficient
• 11–33 Should be sufficient
• 99 Insufficient
c) Insure the selected bearer type is supported by the called party.
d) Then, insure the selected bearer type is supported by the network.
e) If no success, try bearer selection type: AT+CBST=0,0,3
f) Use the AT-command AT+GCAP to insure the SIM card is available for data/fax calls.
This command gives the complete capabilities list.
Cause value Diagnostic Hint
1 Unallocated phone number
16 Normal call clearing
17 User busy
18 No user responding
19 User alerting, no answer
20 Call rejected
21 Number changed
31 Normal, unspecified
50 Requested facility not subscribed Check your subscription
(data subscription available)
68 ACM => ACM max Credit of your pre-paid
SIM card expired
252 Call baring on outgoing calls
253 Call baring on incoming calls
3,6,8,29,34,
38,41,42,43,
See AT command manual for further details
44,47,49,57, or call network provider
58,63,65,69
70,79,254