BRK is a file format associated with Brooktrout 301, a model of fax machines. The Brooktrout brand is currently owned by Dialogic, the well-known IT company located in California, and in recent years has specialized in fax over IP solutions. A BRK file contains the digital copy of a fax image sent through a modem of fax machine. Similar file extensions connected with Brooktrout faxes are 301 and BRT.
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