Do it yourself voice encryption CELP

[1016/2EF221]

For those interested in off-the-shelf vocoders that implement
the high-compression CELP algorithms, you might be interested
in the ZyXEL model U1496E+ modem (about $400) that offers
19.8(and maybe v.fast when specified)/14.4 kbps fax/ CELP
(subscribe to comp.dcom.modems for more info).

For those interested in the CELP algorithm directly here is some
specific directions on getting your own copy: