User guide

Chapter 4: Wireless CallFinder Application Options
Multi-Tech Systems, Inc. CallFinder GSM Cellular Gateway 17
8. To determine whether the CF100 is set as FXS or FXO, type at>fx? .
The CallFinder will return either “FXS” or “FXO.”
9. To set the interface as needed for your system, type the appropriate command:
AT>FXS and then press Return.
AT>FXO and then press Return.
10. Connect the RJ-11 cable to the appropriate receptacle on the CallFinder (FXS or FXO).
Connect the other end of the RJ-11 cable to the telephony device appropriate for your situation (analog
phone, PBX CO/line port, PBX station port, or telco POTS line).
Important note about DTMF tones
When the GSM network sends DTMF digits to the CallFinder, they are "in-band" as part of the compressed
voice stream. This audio compression may distort the DTMF digits causing them to be "out of spec". Because of
this potential distortion, we cannot guarantee that the attached PBX will properly detect incoming DTMF digits.
Connection Situation #1: CF100 to Analog Phone
FXS
CF100
Cellular Network
Analog Phone
2nd Party Phone
Wireless
CallFinder
1. Plug an analog phone into the FXS port of the CF100 Wireless CallFinder.
2. Make a call to a 2nd Party with the analog phone (dial as you would from any cell phone).
3. If a connection is made, the CF100 CallFinder has been configured properly.
If a connection is not made, see the “Troubleshooting” tips in Chapter 5 of this manual.