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How to determine FL analog line is down

Is there a way to be alterted that the FL line is down(line cut or loosed etc). What I know is that even FL line is not attached FXO port is still up. Obviously I can make a call and if it's busy I know the line may have problem, other than this is there any other to determine it, like show commands..? Thanks

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Re: How to determine FL analog line is down

These can be hard to nail down. Call Mgr tracing won't show much normally...a router debug that catches will help you

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