It seems to be some station related forms and teldir as you said, although it seems like it happens to most forms, the ones I tried today well onsite were System Speed Dial, Hunt Groups, and ONS Assignment, but I could open them READ ONLY anytime.
The interesting part is even when the only activity is the "heartbeat" signal (AREYOUTHERE) is locks me out of the forms on the older system but the biggest issue is they cannot set wakeup calls...
I think I might call the Opera technician that installed this a few weeks ago, he made the mistake of giving me his direct cell phone number.
Also, I am going to see if Opera can send the wakeup information via the PMS interface, right now those options are grayed out in the Opera operators screens.