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Digium's Fax For Asterisk gives Asterisk the ability to send and receive fax documents over both legacy telephony and VoIP connections. Incoming faxes are routed through the Asterisk dialplan and stored as TIFF image documents. Outbound faxes are initiated using standard Asterisk call origination mechanisms and are generated from locally stored TIFF documents. Fax For Asterisk is provided as a software add-on to Asterisk.