Unity Connection Port Status Monitor

There's a quick & dirty way to monitor port status in Unity Connection to confirm the called, calling, redirecting number, redirecting reason & mailbox reached.

First navigate to System Settings > Advanced > Conversations, enter your PC's IP address into "IP Addresses Allowed To Connect For Port Status Monitor Output" & then tick "Enable Remote Port Status Monitor Output":

Note that you have to wait a bit, sometimes even 15 minutes, for the change to become live.
Now you can Telnet to port 5000 on you CUC server & view port status information in real time, such as the example below:

CallData, 8, CallerId=7999, CalledId=9010, RedirectingId=9010, AltRedirectingId=, Origin=16, Reason=8, CallGuid=EEAA4D0D4BD944ABBA8E1860437598BC, CallerName=Cisco Trainer, LastRedirectingId=9010, AltLastRedirectingId=, LastRedirectingReason=8, PortDisplayName=PhoneSystem-1-001
Application, 8, 7999, AttemptForward
State, 8, 7999, State - AttemptForward.cde!Dummy
State, 8, 7999, Event is [NULL]
Application, 8, 7999, PHTransfer
State, 8, 7999, State - PHTransfer.cde!LoadInfo
State, 8, 7999, Event is [TrueEvent]
Application, 8, 7999, PHGreeting
State, 8, 7999, State - PHGreeting.cde!PlayGreeting
Display, 8, 7999, Call answered if needed
Display, 8, 7999, Playing greeting for Subscriber:  Voicemail Test House
State, 8, 7999, Event is [HangupEvent]
State, 8, 7999, State - PHGreeting.cde!DoHangup
State, 8, 7999, Event is [HangupEvent]
Display, 8, 7999, Idle

Handy for quickly troubleshooting calls not delivering to the mailbox you intended, however remember that in an HA cluster you'll need to Telnet to port 5000 on the server that the ports are active on.