What is the quickest way to test the Cisco Unified Communications Manager configuration part of
MWI to see if MWI On and MWI Off is working?

A.
Dial into Cisco Unity Connection from an IP phone. Enter the MWI On numbers, then enter the
MWI Off numbers.

B.
Call a voice-mail user and ask them if their MWI light is on, and then disconnect the call. Call
the user back and ask if the MWI light is off.

C.
In Unity Connection, issue the MWI Flash command to turn all MWI lights on, then off.

D.
If MWI numbers are dialable from an IP phone, dial the MWI On number. If the light comes on,
then dial the MWI Off number to see if the light goes off.

E.
MWI cannot be tested directly from the Cisco Unified Communications Manager or an IP phone.

Explanation:
Link:
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_tech_note09186a0080711ae3
.shtml