Extension Status Unavailable


I’m now setting up the UCM6204, The terminal is BT100.
First, I want to make an extension call between BT100
connected to the same LAN with UCM6204.
I set NetWork and extension,
but it remains Extension Status Unavailable.

PBX-Info UCM6200 Series Model:UCM6204 V1.5B
Version Information Base:

Please tell me the solution.

my-name kazu