Have you got the DK280 Light On and DK280 Light Off notification templates enabled in the mailbox?
Have you programmed P*32 for the VM Message Centre Port (first VM port on the DK280)to the port of the phone?

To test if the MW light is working dial #63 xxx (extn number) to see if the MW light flashes
Then dial #64 xxx to cancel it.




Regards
Carl