It's a good question Glen, off the top of my head I'm not sure.  When 
one or more codecs are combined it's called transcoding and IIRC often 
causes problems.

Alaw/mulaw are rather non-linear operations.  That could upset the 
parameter estimation algorithms.

- David

On 17/09/16 11:38, glen english wrote:
> David
> you are the man to ask this one
>
> Why do (or why do you think) relatively benign companding algorithms
> like Alaw, uLaw,  that are commonly used for encoding for VOIP links for
> radio systems (and other) , sounds so awful when they pass AMBE/ AMBE2
> etc processed speech ?
>
> Must be something to do we the re distribution of the quantizating noise
> characteristics?
>
> Not sure what the effect is yet with codec2, but that would be a cinch
> to test up.
>
>
> g
>
>
>
>
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