[cisco-voip] Echo to the Same numbers

[Carter, Bill]

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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