I am having the exactly same problem in a HK elastix PBX. The circuit keep restarting and the console keep have that overrun message.
Our system is Elastix 2.0.1
We have replaced the Dell motherboard, riser card, openvox D110E card.
I have also downgraded the libpri from version downgrade from 1.4.11.3-0 to 1.4.11.-0
rcuadra, I'm having exacly the same problem with a D110E, did the driver fix, fixed your problem, no more d-channel going down or call's with noise or so?
haywood: did you solved the problem with your D110E? if yes how?