Zap channels

hi this is ali

i have installed zaptell and doing best for about three months but now some time it work best when i reload extensions and dialplian but after some time it again create the same problem that some time outging calls work well but some time it hangs up the call what should i do.
plz some me this problem.
thanks in advance

The lack of details results in the lack of a reply with a solution.

Please see:

This proves only that you have at least partially set up your zap channel. The fact that you can’t make outgoing proves that you have not completely set it up correctly.

some time zap done well but some time problems with outging calls