User guide

Multi-Tech Systems, Inc. CallFinder GSM Cellular Gateway 22
Chapter 5 – Troubleshooting
General Troubleshooting Tips
1. Be sure that the RJ11 cable is plugged into the CallFinder telephony connector that is appropriate for your
application (either the FXS or the FXO interface).
2. To check which interface type your CallFinder is set for internally, use a terminal program (like
HyperTerminal) accessed at your command computer (connected from serial port on computer to RS-232
connector on CallFinder). The terminal program should be set to 115200 bps, 8N1, and Hardware flow-
control type. The command used to check the CallFinder’s current interface type is AT>FX?. The CallFinder
will return either “FXS” or “FXO” in response.
3. Check the VOICE/DATA switch on the back of the CallFinder. It should be in the VOICE position during
operation. The switch on the GSM CallFinder never needs to be in the DATA position. Be sure that the
switch is definitely in the VOICE position during operation.
4. Check the signal strength LEDs. At least one LED should be illuminated. If not, your Wireless CallFinder
does not have enough signal strength to operate properly.
GSM Specific Troubleshooting Tips
1. Check the orientation of the SIM. It is possible to install the SIM backwards and/or upside down.
Note that your Wireless CallFinder will produce dial tone even if there is no SIM installed.
2. Try calling the telephone number assigned to the SIM. It is possible that your service is not ready or that
there is a problem with your subscription.