We have two HiperDSPs in a TC rack and the second one suddenly stopped taking calls. When the first card filled up, callers would get a fast busy. The card in slot 1 works fine, the card is slot 2 gets fast busies when card one fills up. I was on the phone with several telco techs for several hours and they believe the lines are OK. I was upgrading the HiperDSP code about the time the problem occurred, and the card failed, so I thought it was related to that. I plugged in a backup card (just the NAC) into slot2 and the card came up and started taking calls. Which made me think the problem was related to the card. BUT, we are using PRI T1s, the phone company says they are using using NI2, and when I look at the trunk settings for the two slots they are identical except for: TRUNK SETTINGS: SLOT1 SLOT2 Jitter Attenuation attenJitterOnTxmtr attenJitterOnRcvr Primary Switch Type priSwNI2 priSw5ESS My question is whether the HiPer DSP can be set to the wrong primary switch setting and still work? Does the fact that the two different slots are set to different Primary Switch Types mean anything? Seth ---------------------------------------------------------------- Seth Jacobs, OnRamp113, 707-678-0267 voice 805 N. Lincoln, Suite D, Dixon, CA 95620 www.onramp113.com