Voicemail blast to multiple mailboxes

I need to know how to send one voicemail to multiple mailboxes on our system. Does any one know if this is possible and if so how to set it up?

Essentially I would like to set everyone in my office up with a voicemail box. In the event of an emergency I would like to call into the system with one message but blast that one message to all the voicemail boxes on the system. That way I dont have to call everyone and leave the same message.

Can this be done?

Thanks!
Kristen