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That is a Lucent DSP UnderRFShield that provides CallerID, DTMF, modem, and speaker phone potential.

Thought to be a DSP1653 see the schematics directory http://www.TuxScreen.net/download/schematics/

Data sheet lists "ROM 24 Kword diffusion". TimRiker wonders what a DiffusionROM is.

Here are some UndocumentedDSPFunctions.

Perhaps a Linux Telephony driver should be written?

http://www2.linuxjournal.com/lj-issues/issue82/4468.html

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