In communication manager , find the station port id from the station form and run the command status station , on page 1 you will see if the station has a message indicator and where its come from.
If you don't see anything on the status station screen try the below
display internal-data susr_rec XXXX where XXXX is the station number there is a field mw_on:0 0 indicated the lamp is off 1 indicated the lamp is on.
To further test try the below to force the lamp on and see if it activates immediately , this at least lets you know where to look further.
2. If the issue is still existing then recommend to check if the MWI led works fine at all. I recommend the following test by testing Leave Word Calling (LWC) feature on one of the phone where the lamp is not activated by the MWI messages. The following test can be done remotely on customer system:
i. Make sure if "Leave Word Calling Send A Message" and "Leave Word Calling Cancel A Message" features are enabled by assigning Feature Access Codes (FAC) for each, change feature-access-codes:
Leave Word Calling Send A Message: *13
Leave Word Calling Cancel A Message: #13[/b]
ACSS (UC/SBCE/SM/SME)
Not that they mean a thing anymore , get a brain dump pass the test crash the system.