As far as I know it should work as I know it works on the digitals.
If you can intercom call and transfer to the phantom then we have to assume that it's set up properly.
I would retrace your steps in 407 & 408 and delete or clear the entry and start over.
Did you try a simple reset of the system?
You may want to make sure there are no entries in 603 & 604 DIL 1N. The DIL 1-1 is supposed to overide any entry in 603 & 604 and I know it does on the digitals but again I really never work on the analog systems.
I'll try to do a little more investigating.
Keep us posted, Thanks, Gem [Linked Image from sundance-communications.com]