asterisk users - Mar 2007 - WMI from Asterisk to Cisco Call Manager

Hi all,
 
We want to put an Asterisk Voicemail Server behind a Cisco Call Manager.
The idea is to have Cisco Phones (SCCP) registred to the CCM and the voicemail
in the Asterisk Box.
The trunk inter PBX is in SIP.
 
My question is:
Is it possible to activate MWI LED from the Asterisk to the Cisco Phones
registred to the CCM when they receive a new voicemail ?
 
Thanks in advance
Fred
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