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I have had a UC540 with several 7975g phones for several months now and I use Skype Connect as my SIP Trunk service provider. Throughout the entire time that I have had the system, I have been plagued by intermittant busy signals. It seems to happe...
I solved it! I reset the UC540 to the factory settings and put it directly in front of the WAN (removing the NETGEAR router from the equation). After setting everything up again, the problem appears to be fixed. I have no idea what the router was ...
It never happens with internal calls and it never happens with the FXO line (we have 1 FXO line and a SIP Line). Our incoming phone calls are routed to an Auto Attendant but I was getting the same problem as I am now even without the auto attendant ...
