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Secure voice software issues

> I do know that ZyXEL's modems are able to do real-time CELP using a
> 68000 processor. The low-end models can do CELP encoding at 9600 baud,
> and the faster ones do better-quality encoding (ACELP, I think they
> call it) at 19200 baud.

I believe that there is a DSP of some kind in there in addition to the 68000.
Also, only their high end modems do CELP.  The regular 14.4/16.8 one doesnt't.