I have gotten thrown into trying to solve a troublesome issue with our Starplus STS system.

We have the voice mail tree set up so that when the phone is unanswered they hear the welcome followed by "press 1 for....press 2 for...and so on.
Here is the problem...
Sometimes when someone calls and it goes unanswered, it works correctly. i.e. it goes to the voice mail system correctly.
Sometimes when a call goes unanswered instead of going to the voice mail tree it goes to a certain extension and gets that specific person's voice mail (not the voice mail tree). I can not figure out why it is doing that.

I have a "Station User Guide" and have tried clearing out every bit of call forwarding and I even thought that maybe the station it is going to was set up as a Secretary Station but I have no idea how to change that if it is.

We have three lines and it's all set up to "hunt" for those other two lines if line 1 is busy. But this issues happens regardless if there is a call on line 1 or not. I have contacted a local Vodavi company here and they have no idea what to do. And of course when their tech is here and calls in the voice mail system works exactly as it's supposed to.

Any ideas?