[asterisk-dev] Building an embedded Asterisk PBX

[Greg Boehnlein]

On Sat, 2 Sep 2006, David Rowe wrote:

> > Can I ask.. are the FXO and FXS modules off the shelf or custom? 
> 
> Sure. They are custom designs (i.e. we entered the schematics, laid out
> the PCBs etc), but the circuits are pretty much straight out of the
> Silicon Labs data sheets.  The schematics/PCB designs are on my site if
> u would like to check them out.

With regards to echo cancellation, it is my opinion that it is 100% 
neccessary to have hardware based echo cancellation on any piece of 
hardware that will be deployed in a customer scenario. In all of my 
experiences, I have finally come to the conclusion that the Software Echo 
cancelling routines in Asterisk are just not acceptable enough to deal 
with, and eliminate all forms of echo. I.E. some echo and artifacts always 
remain. As a result, I have made the decision to deploy all hardware based 
Echo cancelling cards.

Do you think the blackfin STAMP has enough horsepower to enable carrier 
grade echo cancelling? Or is there an easy way to include a DSP based Echo 
canceller into the system?
 
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