It worked fine yesterday afternoon...in the process of setting this system up for a client. Now I am unable to make ANY calls to or from the system, or to/from any extension. Extension to extension calls - busy signal (not fast busy), calling phone shows "call failed". Incoming calls - 3CX log shows "not answered", but the extension never rings. Outgoing calls - busy signal (not fast busy). Calling phone shows "call failed". Configured an SBC on a remote site yesterday evening, but other than that, I know of nothing that has changed since yesterday. I'm sure it's something simple, but I can't find it. Any suggestions?