[Freeswitch-users] Choosing a Codec.

David Knell dave at 3c.co.uk
Tue Dec 22 19:29:28 PST 2009

On the other hand, a u-law WAV turned into L16 and then back to u-law to
be sent down the line shouldn't suffer any alteration at all - if it
does, the there's something wrong with the translation.

The quality dropping over time is almost certainly down to something
else.  Vinuth -can you get a recording to compare with the original?


> If its degrading like that you have bigger issues... the sound files played from wav files vs raw PCM files is NO different on a land line and I speak from very many years of experience... your wav files are ulaw in wav containers thus will never play native which might just be part of your problem.  You would have to have raw headerless data in a .PCMU file for it to play native.  
> Can you elaborate on your setup a bit more?
> /b
> On Dec 22, 2009, at 4:54 PM, Vinuth Madinur wrote:
> > The audio quality is a lot different when it plays on the landline. And the quality degrades a bit when the message played is lengthy >30s. So I thought it would be better if I have the file in mu-law and play it as is..
> > 
> > Thanks,
> > Vinuth.
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