[asterisk-users] Tellabs and a PRI

[Doug Lytle]

Doug Lytle wrote:
> Another question,
>
> Is anybody using the Tellabs 2572 EC with a PRI. When we moved from 
> our analog lines to a PRI, I thought it would be simple stuff moving 
> the EC to the PRI. Changed signaling, made sure that channel 24 wasn't 
> being ECd and everything came up. But, I was getting complaints of 
> random echo on the PRI. Local echo. Also, we weren’t able to do any 
> kind of modem dial-outs (Adit 600 supplying the dialtone). Funny thing 
> is that inbound/outbound faxing was working fine.

Figured this one out.

The Tellabs cards that I've been purchasing have the send side echo 
canceller (Option 38).  This works great on analog lines, but apparently 
won't work on a PRI.  Turned it off and now I can use modems.  Since 
this was put into place over the weekend, it remains to be seen if it 
takes care of the local echo.

Doug


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