[asterisk-users] monitoring asteriks

[Joseph]

How can I monitor asterisk if all lines are registered etc?

I have an asterisk on a remote location and sometime they reporting problems that phone is not ringing, they can not dial out etc.
Usually I just restart asterisk and it solves the problem.

Is there an application that will email me if case any line looses registration with with asterisk?  
Or any better solution!

-- 
Joseph