By default, the Digicom 2G GSM Fax fixed cellular terminal (FCT) unit is configured to allow only fax calls. Although the unit is capable of handling both voice and fax functionality, the voice element must be enabled manually.

To do this, connect an analogue phone to the unit via one of the RJ-11 connector ports.
On the phone, lift the receiver and enter a code of *1234#
Ensure that you hear two long beeps confirming that the feature has been enabled.

Your unit is now configured for voice calls.