asterisk users - Jul 2004 - X100P Red Alarm after echo on the line

Hi,

	I have an Asterisk box with two P100X connected on two UK (BT) lines. When
I make a call, sometimes, I get too much echo and the system gives me a Red
Alert. After that the line is busy. If I disconnect the line from the X100P
and I call the line, I get ringing tone. When I reconnect the line on the
X100P I get busy tone. For some reason the X100P gets to a state that stays
open.

Any ideas?

Thanks,
Yiannis.