Multi-Tech Systems MTCBA-G-F1 - Manual (Page 22)

Chapter 4 – Safety
Multi-Tech Systems, Inc. MultiModem GSM/GPRS User Guide 22
Situation B: The modem always returns «Error» when trying to issue a communication
If the Wireless MultiModem returns a message of error upon an attempted transmission of data or voice
signals, see the table below for possible causes and solutions.
Solutions for “error” message situations
If the modem
returns Then ask … Action
Error Is the modem registered on the
network? Follow “Verifying network registration" procedure to
be sure modem is registered on network.
Is the modem receiving an
incoming call or is it already in
communication? End any communication using the ATH command.
Does AT+CREG? return 0,1
(registered) or 0,5 (registered
roaming)? If not, check for adequate signal strength on network.
Use AT+CSQ.
Is the selected bearer type
supported by the called party?
Is the selected bearer type
supported by the network?
In comm. program, type AT+CMEE=1 to view the
extended error codes (see “Error Results Codes" in
the AT Command guide).
Be sure called party and network support selected
bearer type.
Be sure that semi-colon (“;”) is typed immediately
after the phone number in the AT command. e.g.,
ATD######;
Is the received signal strong
enough? See “Signal Strength Verification”
Is the antenna properly
connected? See “Antenna Specifications”