[Asterisk-Users] BAD/GOOD Echo Cancel

[Doug Lytle]

Doug Lytle wrote:
> Doug Lytle wrote:
>> asterisk at anime.net wrote:
>>
>> I put a Tellabs 64ms echo canceller into my facility this weekend and 
>> am praying that it removes are echo problem.  If it does, I plan on 
>> making it a standard on my Asterisk installs that have a channel bank 
>> or T1.
>>
>
> Well, the day is almost over here and not one echo reported today.  
> Very impressive!  I had 5 more cards delivered today.
>

Just as a follow up to this. 

I purchased 5 Tellabs 64ms cards on ebaY.  The very 1st card that I put 
into production worked quite nicely (Little residual echo, but very much 
an improvement).  I was on site this weekend and figured I would test 
out the remaining cards, one at a time to confirm they were in working 
condition.  This upcoming Monday, I had many complaints of echo.  Went 
back Tuesday morning and went over the settings of the previous card 
compared to this replacement.  I turns out that only 1 of the 5 cards 
had option 38 available (Send Side Echo Cencellation).

So, if you are in the market for one of these cards because of local 
echo, you'll want to confirm with the vendor of 'Send side Echo 
Cancellation', or at least ask him to check for option 38 after powering 
up. Out of the 5 purchased, only 1 had it.

Doug

-- 
Ben Franklin quote:

"Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety."