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.