Echo in T1 voice blade for 6500 switch

Dear all,
I use the T1 voice blade for the 6500 and I get a couple of seconds of echo on certain calls. Does any one know how to solve it? I saw from the forum, it is an expected behavior in T1 voice blade. Is there any release notes regarding about this? Thanks for your help
Gary

Echo is normally caused by a mismatch in impedance from the four-wire network switch conversion to
the two-wire local loop.
The follwoing Parameters has to be adjusted
echo-cancel enable
echo-cancel coverage
output attenuation
input gain
Also check the following link which has a sample Echo Analysis Case Study and to adjust the parameters accordingly to your topology
Echo Analysis for Voice over IP
http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/voipsol/ea_isd.htm#xtocid29

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For the past month, I've had an echo of my voice while I'm talking on my phone. It's very annoying and sounds like multiple people are speaking at the same time and it's only me. Anyone know what's wrong?

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Echo in T1 voice blade for 6500 switch

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