I tried to get it to do it as well and same problem as you, if they dont dial are busy no problem, if the dial the wrong number disconnect.

after tring everything., do you know what number they could be dialing, if it was a small range of numbers you could set up a range of extension numbers as groups or ps and set them on fwd to operator this will help stop wrong numbers

“I have not failed. I've just found 10,000 ways that won't work.”