After a recent reconfigure by our Mitel installer, I am just now re-testing Video call internally.  This is something that was working.
The error is:
sun.security.validator.ValidatorException No trusted certificate found
This appears to be some kind of certificate issue, perhaps SSL ?  Interestingly, I have another question posted about generating a self cert within the server manager.  It doesn't recognize DC as a state (of course, neither does the rest of the country).
Anyone encounter this issue or have a clue how to address it?  Wild guesses accepted.
Adam in DC