The fax function of the PBX supports fax transfer in combination with a corresponding PC application. The required COMpact/COMmander Fax printer driver has to be installed on the PC used.

The COMpact/COMmander Fax printer driver transfers the document to be faxed to the PBX that subsequently saves the document for the fax box used and sends it in the background using the corresponding fax identification. If the destination of the fax is not available (busy or no reply), two further dial-up attempts will automatically be made by the PBX.