Thank you all for your suggestions, the final fix was to reset the DSP card. I don't know if this was a bug tickled by someone trying to do MultiLink over a PRI fed DSP (we don't support MultiLink) but that is the only thing I can see that may have contributed to this issue. We had signed up a new customer for this POP and they were the only ones trying to do a multilink session, never saw that attempted before in the radius detail logs. Oh, well... add that to our KB of quirky issues with 3COM gear! (to be fair, we have had great success with our TC chassis's) - Mike ------------------------------------------------ Rock Island Communications, Inc. (360)-378-5884 http://www.rockisland.com/ San Juan Islands, WA ------------------------------------------------