[cisco-voip] Echo to the Same numbers

[Wes Sisk]

Usually this means echo is being caused at the far end.  Due to round  
trip time it is not possible to cancel that echo on our side.  The far  
end CPE is not playing by community rules.

/Wes

On Jun 24, 2009, at 10:06 AM, Carter, Bill wrote:

CM: 6.13
3845: 12.4(22)T1
ISDN PRI
Phones: 7942 load 8.4(4)

voice-port 0/1/0:23
  input gain -2
  output attenuation 3

Strange situation here. I have a Call Center with about 80 users. This  
is an Inside Sales group so they talk to a lot of the same callers.   
We have identified about 6 PSTN numbers where the Cisco phones have  
echo every single call. The IP Phone user hears their voice echoed  
back. Echo persists for the entire call. When the users talk to other  
callers they have no echo. A phone call to one of these PSTN numbers  
from another Cisco phone has the same echo.

Anyone had any luck with “echo-cancel erl worst-case 3” ?
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