[asterisk-users] TDM-400, Polycom SIP phones, and echo problems

[Peter Doyle]

Hi Stephen,

I'm sure someone here can help with the echo, but I just wanted to say I
can highly recommend the Sangoma a200d boards with Octasic hardware echo
cans.  I spent a couple months trying to deal with echo using a TDM400p
and even a Vegastream SIP gateway with hardware echo can.  The quality
of the Octasic echo can on the Sangoma kit is amazing- literally 5
minutes after installing my a200d my echo was gone.  Once it has
converged (which happens very quickly), its just like a "normal" phone.
With the Vega most of the echo was gone due to the echo can, but we saw
echo in "double-talk" situations.  

 

It was more expensive, but definitely worth it.  

 

I would definitely also look into the new HPEC or Sangoma Softecho,
which I just saw on the wiki (voip-info.org).  Might be a good option,
though I haven't tried either (there was a discussion on this list about
the HPEC canceller just a few days ago)

Pete

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