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CELP compression is currently available only on Plus model modems.  The 
implementation of CELP in the ZyXEL plus model modems is proprietary.  As
such, ZyXEL has not published any information regarding the manual decoding/
encoding using this method.  ZyXEL also will not confirm nor deny any 
sources of information that will will further elucidate the CELP decoding/
encoding algorithms.

A listing of all the US Federal Standard 1016 sources is available by
sending e-mail to Robert Wong (rwong@direct.ca).  

The numerous pages of USFS descriptions do not help in decoding ZyXEL's CELP.
They may help to understand what ZyXEL's CELP C code basically does. The 
USFS 1016 descriptions are nice to learn about what CELP *could* do ;-)

For further understanding of CELP, it needs a real mathematician and deeper
knowledge of voice processing theories.)