asterisk users - Dec 2006 - Using Asterisk/Digium card with Tadiran switch

Hello,

We've got an Asterisk server with a Digium TE110P card, connected to a
Tadiran Coral Flexicom IPX 500 switch using a T1 card.  We are having
echo problems on the lines coming in from the Digium card.

I was wondering if anybody is successfully using a Digium card and
Asterisk with a Tadiran switch, and if so whether they could share
some configuration information?

Thanks!

----Scott.