User guide

Chapter 4: Wireless CallFinder Application Options
Multi-Tech Systems, Inc. CallFinder GSM Cellular Gateway 19
Connection Situation #3: CF100 to Analog Station Port on PBX
Caution: When connecting a CF100 CallFinder to an analog station port and allowing incoming calls
through that CallFinder, the PBX must be configured to prevent the incoming caller from using
the CallFinder’s secondary dial tone to make calls to a third party. Such ‘call-through’ activity
could be expensive to the PBX owner. The secondary dial tone is intended to allow the outside
party to reach any extension on the PBX. However, without limitations on dialing at the
secondary dial tone, an unscrupulous caller could make toll calls (perhaps very expensive
calls) that would be charged to the PBX.
1. Set CallFinder’s Interface to FXO. Use HyperTerminal (or other communications program) to check the
current Interface setting, to change the Interface to FXO if necessary, and to confirm that change.