[asterisk-users] Asterisk 1.6 vs 1.4?

[Tzafrir Cohen]

On Thu, Jun 05, 2008 at 03:00:01AM +1000, Rob Hillis wrote:
> Brent Davidson wrote:
> > We're currently using Asterisk 1.4.19, Zaptel 1.4.10, 
> > Oslec SVN,  Rhino R4FXO-EC cards, and Snom 300 Phones.
> 
> Why on earth are you running two layers of echo cancellation - hardware 
> and software?  To be honest, I think this is asking for trouble - I've 
> seen two occasions where having Oslec and hardware echo cancellation has 
> caused significant problems with audio quality - the usual symptoms are 
> gaps in the conversation as the hardware cancellation eliminates the 
> majority of the echo and the software cancellation subsequently 
> eliminates parts of the conversation.

If you use a hardware EC (or technically: a span-specific echo
cancellation method) the generic Zaptel echo canceller (software-based,
OSLEC in this case) will not be used.

-- 
               Tzafrir Cohen
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