[cisco-voip] IP Communicator and Unity MWI

[Alex]

Hello there,
I am having problems in the lab lighting up MWI on IP Communicator 2.1.1. CM 
4.1.3
integrated with Unity 4.0.5, voicemail left (and verified), MWI/envelope 
icon on
IP Communicator does not show up. If I dial "MWI ON" extension from IP
Communicator, the envelope icon appears.
MWI on IP Blue connected to the same cluster works fine, envelope appears
without dialing "MWI ON" extension
Any suggestions?
Thanks very much
Alex