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phones can receive but not make calls

I have an issue similar to the link below.  About 2 weeks ago we had one phone not able to place calls.  It could receive calls but could not dial out.  Reseting the phone did not fix the problem.  I configured a 2nd phone with a button using the same DN and it couldn't place outbound calls either.  It seemed like the problem was with the DN not the phone.  In any case I rebooted the UC520 and the problem went away.  About a week later a 2nd, different phone was affected by the same problem and I had to reboot again.  In my case neither the config or IOS and CME versions have changed in almost 2 years.  I don't understand why this would start happening with no changes to the system.  I am running IOS 15.1(2)T2 and CME 8.1.

Any ideas how to troubleshoot this?  What would be good debug commands to use and/or gather more info?



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