[VoIP] Echo Cans vs Asterisk

[John Novack]

Funny you should mention that, but I just bought off of eBay some 
2531's, cheap, so if you have any docs on them I would cover any copy 
costs. I only have the cards, so I will need to look for some sort of mount

Still waiting on my 4 port T1 card to arrive, so in the next fw weeks I 
will be in the pool with you

John Novack


Greg Blakely wrote:
> For those of you who have any echo problem on your TDM (ie, zaptel)
> devices,  echo cancellers cannot be beat.  I have been fighting with
> echo from my telco POTS line as it entered my channel bank (and then
> into my asterisk box).  I fiddled with all of Asterisk's echo cancelling
> settings, and was underwhelmed.   I **did** find a great improvement in
> the newest version of Asterisk echo cancelling, but I still had to pad
> my outbound levels to such an extent that people often asked us to speak
> up.
>
> Then, I got to looking at the echo cans we use where I work.  The CLEC
> part of our operation uses them on all of their voice T1s.  An entire
> rack was full of quad-t1 echo cans.  And I got to salivating about the
> possibilities for Asterisk.
>
> But brand new echo cans are not inexpensive.  So,...  what to do?
>
> Answer?  eBay, of course.   For around $60 including shipping, I now
> have another shelf in my 19" rack that contains 7 TelTone 2531 T1 echo
> cancellers.   I cobbled together the first one with old cable and jacks
> -- a really ugly site - and now can talk as I would if the outside line
> was hooked directly into my Comdial KSU.   
>
> What a concept!  A telephone line that doesn't echo!
>
> So, if you have a T1 card, and get any echo at all on your zaptel
> connections, don't screw around with it.  Just put in any old hardware
> echo cancellers.  It'll end your being disgusted with Asterisk's POTS
> interface capabilities.
>
>
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