I'm having the same crackle/static issue. Seems more noticeable on outbound calls over inbound ones. I'm running a TDM2400 with 7 FXO lines currently in use. Card is on it's own IRQ, Athlon 3200 processor, Nvidia chipset. It's somewhat intermittent - much like my zttest results - I'm not sure if they are related or not. -Nick
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