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 I have a Snom 320 running firmware 8.7.3.25.9 that works perfectly with the exception of the message led does not come on when the phone has messages. the studder dial-tone does work and the message center displays the correct number of messages. i have tried the below with the noted results

1) upgraded to the latest firmware

                    result:broke BLF on the expansion module

2) added CurrentIdentityHasVoiceMessage to the led_message_usage in the xml config

                     result:no noticeable effect

3) rebuilding mailbox on server

                     result:no effect

4) monitoring a different mailbox

                     result:no effect(still no light)