Just a point of reference for others, we had a lot of echo on an Adtran Channel Bank connected to a T100P.
The end poitns were all Polycom Ip500's on a local lan connecting to *.

We couldn't solve the echo with any software settings and installed a Tellabs Echo Can shelf 255D i believe with 64ms echo cans, that resolved the problem completely.

No more yelling from the secretaries :)

I'm happy.

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