How do you get an extension that's forwarded to go to the mailbox of the extension it is forwarded to, and not return to the mailbox of the extension that was forwarded?

If x101 is forwarded to x102 and 101 is called it will go to 101 mailbox. It always goes to the extension that was initially dialed. You can set x101's mailbox as none. In this case the call will go back to the main greeting after ringing 102.

Thanks for the response helpifican I always think, ,to myself, and believe that if you want it I can do it . Not here. NEC can you hear me?

Look back feature can be a pain but I find it helps quite a bit. What functionality and you trying to accomplish? Usually, this can be done in a different way.