I've been working with Digium, but hopefully someone on-list has an idea... The card will transmit audio to the T1, but everything it receives is completely unintelligible static (in place of received audio only, not all the time). I've verified everything on Digium's troubleshooting checklist and they were unable to find anything when they logged in. zttest yields 100% for the most part, with an occasional (< 5%) 99.9877. zttool reports no missed interrupts. The TE205P is on IRQ 5 and not sharing. Turning on or off ACPI, APIC, USB, etc. has not helped. They had me check patlooptest, which failed miserably (literally thousands of varying comparison errors per second). Now I've received a replacement card that does the exact same thing. I've tested in 4 different boxes with the same results. The primary has a Supermicro P8SCT motherboard with 3.4 GHz P4, 2GB RAM and SCSI drives on Linux md RAID1. Removing the SCSI controller and using a UDMA IDE drive didn't help. Other systems I tried were all IDE and either PIII or P4. Same exact problems. Maybe I just have bad luck with these cards, but I'd greatly appreciate any other ideas or suggestions from the list. Thanks, Tim