I have a DBS576HD with 1 analog co card, only 4 extensions used off the back plan, and a linux based IFM voice mail in slot 5. All has worked well since install about 3 years ago till today. Now, no phones ring and voice mail answers right away. I have checked CF B/NA settings, ring delays and timers and all seem OK. If I remove voice mail card, phones ring correctly. Reinstall and reboot card, back to no ringing, AA answering.
Ron C
Ron C