This is new to me, what is Remote DN ?  Why is it used ?  
This is set up for about 30 phones/faxes in my hospital, 4025s, in various locations with CEID 102.
I need to change this phone ext 7000 to a did ext 6000, but I can't identify the circuit for the ext 7000 to change it.  It's not listed under DNI phones.  It's got to have a circuit that it's attached to?
3300 MXe  Rel 4.2 / 10.2
Thanks.