Multi-Tech Systems MTCBA-G-F, MTCBA-G-F2 Situation C: The modem always returns No carrier when trying to issue a communication

Troubleshooting
47
Situation C: The modem always returns «No
carrier» when trying to issue a
communication
Solutions for “no carrier” message
If the
modem
returns …
Then ask … Action
no carrier
(esp. for
data
communi-
cation)
Is the selected
bearer type
supported by
the called
party?
Is the selected
bearer type
supported by
the network?
Type AT+CEER to view the
extended error code (see
“Interpretation of Extended
Error Codes” table,
p
a
g
e 52).
Be sure that the selected
bearer type is supported by
the called party.
Be sure that the selected
bearer type is supported by
the network.
If no success, try bearer
selection type:
AT+CBST=0,0,3
Be sure SIM card is available
for data/fax calls.