a418c269__IP_Phone_8900_Series____Cisco_eature_support_during_failover_Notes
[Feature] Enhanced Message Waiting Indication [Supported] No [Notes] 
Message count badges do not appear on the phone screen. Only the Message Waiting icon displays.
Cisco Unified IP Phones 8941 and 8945 User Guide for Cisco Unified Communications Manager 9.0 (SCCP and SIP) - Calling Features [Cisco Unified IP Phone 8900 Series] - Cisco