[Asterisk-Users] Frustrated with echo...

[Steve Jones]

I've been using my Asterisk (At my house - 2 modem-type fxos, and an assortment of SIP endpoints for phones) for about 5 weeks now, and I've been really happy with it, but I'm still having an echo problem that I've exhausted google with, and can't get straight...
 
I think I've determined that because I'm using $7 voice modem clones for my FXOs that bad echo is going to just keep being a pain to me...  I think I should have only tried going through "proof of concept" state with them, switching to something a little better quality when it was time to actually commit to Asterisk.  
 
So, my question is "What's better and why:  1: a 'real' digium PCI card with two fxo plugins, or using a couple external SIP fxo units like a grandstream, zoom, or similar"  Personally, I think it would be desirable to keep the FXOs out of the asterisk box itself, just to give me future flexability to move to whatever the platform of the day I want to put asterisk on, without dealing with a PCI card to move, but if the consensus is that the voice quality and support for the digium board is the best, then that's what I'll do..  
 
So, any comments on relative quality of these devices, and/or ones I've missed?
1:  Grandstream HT-488
2:  Zoom 5801/5802
3:  DGM-TDM02B  (TDM 400P with two FXOs)
 
Are there any IAX2 FXOs that I'm missing?  That seems to be an area that's oddly not taken care of...
 
Any hints would be greatly appreciated!
 
 
 
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