I'm trying to have certain lines ring to a menu.
I want 0 in that menu to ring 2 phones, if no answer then ring 4 additional phones, if no answer go to a particular MBX.

What I did was to send the incoming lines to a phantom ext
phantom ext forwards to menu, 0 in menu goes to supervised transfer to ext 131, then goes to supervised transfer to group 453, then to MBX 131

Found I could not do supervised transfer to group.
Further found when we dial 0 out of the menu, 131 AND group 453 ring simultaneously, it does then go to MBX 13D

I don't get why this is happening.

Any help would be appreciated.