[Asterisk-Users] Echo on a PRI

[David Goldfein]

Hi,
I recently set up the following in a production system (2.8 GHZ Xeon, 1 Gig
Memory, Dell 2650).

Telco - PRI - Asterisk - T1 - PBX

I am getting an occasional noticeable echo on some of the phone lines
(random inbound and outbound).  Everyone I ask keeps telling me that I can't
be having echo since I am on a PRI, which is a digital circuit.  Ok, so I
can't be having echo, but I am!  Does anyone have any ideas of what might be
causing the echo in this situation?  


Thanks,
Dave