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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