Outgoing call are intermittent

[1835bbvaiz]

I have inherited a UC560.  I am not at all versed in Cisco but an learning.  We have been able to solve a lot of issues except for this one last one.  We intermittently can't make outgoing calls.  If we reboot the UC560 we can make outgoing calls for a while and then they become intermittent.  When we cannot make outgoing calls all we get is a fast busy signal.   I am attaching our running config.  I hope someone can help us.

[Dan Lukes]

Note the Setting up UC500 for debugging SIP Trunk issues document.

It may help you to debug the issue. Or the debug logs may help an expert to analyze the issue.