When somebody leaves me a message (voicemail), after listen it and delete it, I have to delete CallMe Back Message. I'm doing of this way:
1) I push Messaging
2) I push Read Message
3) I push Call Me Back
4) Erase Msg
After this, the lamp turn off.
But, I dont leave a call me back message, I just leave a Voicemail.
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LOCATE FEATURE EXTENSION 220
IP Device ID:   23                                                              
Circuit Location : 1 3 1 23 1                                                   
Extension : 220                                                                 
Active Features :                                                               
Phone Lock: UnLocked                                                            
MAC Address : 08:00:0F:2D:C5:0E