[Asterisk-Users] Message Waiting Indicator Bugs?

[Clif Jones]

I have had several cases where the message waiting indicator was stuck 
in the on state
with Cisco 7960 SIP phones.  Here are the two cases:
1. Single extension that mapped to a single voice mailbox. Restarting 
Asterisk or getting a
    new voicemail then clearing it fixed the problem.
2. Three SIP extensions that mapped to a single voice mailbox. Getting a 
new voicemail
    and then clearing it did not fix the problem.  Have not restarted 
Asterisk to clear this
    but I assume it will work.

Has anyone else seen problems like this?
Is there any limitations on how many SIP extensions can share the same 
voicemail box
as far as MWI goes?