Steve Underwood has a FAX softmodem called spandsp[1]. Dude knows a lot about but signal processing which is a topic way beyond my wizardry level. Many years a

Steve Underwood has a FAX softmodem called spandsp[1]. Dude knows a lot about but signal processing which is a topic way beyond my wizardry level. Many years ago I've used it successfully for a FAX server made with Asterisk and cheap telephony cards. Since a FAX is just a TIFF file encoded over sound I think this may be useful for someone that wants to transfer a binary blob over sound. [1] https://www.soft-switch.org/spandsp-modules.html https://www.soft-switch.org/spandsp-modules.html