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Chapter 4 - Troubleshooting and Frequently Asked Questions
Multi-Tech Systems, Inc. MultiModem GPRS USB Wireless Modem User Guide 39
Frequently Asked Questions
Which providers can I use?
● Two major providers are T-Mobile and AT&T.
Does this modem support High-Speed Circuit-Switched Data (HSCSD)?
● No, our GSM/GPRS modems do not support HSCSD.
● The modem is answering, but seems to not be doing anything?
● The modem is answering in voice mode.
● If you are trying to make a data call, make sure the account has CSD service. You will also need the
data number (separate number from the main phone number that is provided by the provider).
I am trying to make a data connection by dialing from my wireless modem to an analog modem. Why
does the analog modem answer and send tones, but never connect?
● To make a data call you must use the ATD<number> command.
● Make sure the account has CSD service.
How do I get the voice portion to work so I can talk to others using the wireless modem?
● You will need a cable that has the speaker pins connected to a speaker and microphone.
● We have a “Y” cable that splits out to a RJ9 connector that can be used to plug into the receiver of a
handset.
● ‘ATD<number>;’ will originate a voice call.
How do I make an Internet connection to my dial-up ISP?
● Make sure you have CSD service.
● Create a dial-up connection to the ISP’s access number, then use your account username and
password and choose the wireless modem as the device.
How does faxing work?
● GPRS modems support Class 1 and Class 2 Group 3 faxing.
● You will need fax services setup on your account. You should receive a separate phone number for
fax just like voice and data, and you must call the fax number for the modem to receive a fax.
● You will also need fax software (we do not have working software). WinFax Version 10 has been
tested with success.
I can’t make outgoing calls. I just receive a NO CARRIER response.
● Make sure the antenna is connected and SIM is inserted correctly.
● Check signal and registration: ‘AT+CSQ’ (10-31 is good), ‘AT+CREG?’ (0,1 is registered & 0,5 is
roaming).
● Check NO CARRIER reason with ‘AT+CEER’. Look up error code in Reference Guide.
The modem will not answer.
● To have modem autoanswer, set modem with ‘ATS0=1’ and ‘AT&W’ to store the setting.
● Send ‘ATA’ to the modem once the RING is indicated on the terminal screen.
● You may need to set modem to ignore DTR, ‘AT&D0’, if you aren’t providing DTR.