[Notifications] Enterprise MWI Use Case

[Cullen Jennings <[e-mail]>]

Phase 1:

Enterprise phones have a little red light on them. This light should  
be on if, and only if, the the email store as any unseen message that  
contain voicemails. I don't really know the precise term for "unseen"  
or "voicemail" mean in this context so hopefully someone can provide  
the right term. On average, this light changes state less than a 6  
times per day. A large system would have less than 100,000 phones  
receiving notifications. The network environment is typically 100Mbps  
although sometimes remote offices with a less than 500 phones will be  
on a slower WAN link. When the state on the email store changes, the  
red light needs to change in less than 10 seconds and changing in  
under 2 seconds is desirable. If a phone is power cycled, the state  
of the red light after the power cycle needs to be correct and can  
not wait for the next time the state changes.








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