Phone system not receiving incoming calls

I have a 3COM NBX V3001 phone system and everyonce in a while it will stop receiving incoming calls. To correct the problem, i have to reset each anaolg card. Is there a way to correct this from happening.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Could be any number of things.  Are you in a rural area by chance?  I have seen issue with the older analog line cards where it doesn't disconnect when someone gets into voice mail or an auto attendant and then hangs up.  

What troubleshooting steps have you taken?  Have you removed one of the analog lines when this occurs and connect it to an analog phone to verify it works?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
henjohn1520Author Commented:
I am not in a rural area and the system is fairly new. I haven't test the analog lines by connect them to a analog phone. What I have notice is when there is a problem, three out of the six cards are in a unknown status. Resetting the phone system corrects the problem.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
IP Telephony

From novice to tech pro — start learning today.