[VoIP] Echo Cans vs Asterisk

[Steph Kerman]

2531?  No.  2551 and 2561?  Yes.

SK

John Novack wrote:
> 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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>>
>>   
>>     
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