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Any ideas/recommendations on how to send out a VM blast to all business accounts over Verizon/ATT/Shortel networks?

Leaders of my HR and Communications department have requested the ability to send out VM blasts over our internal VoIP and mobile telephony networks. I can't recall ever hearing about this type of functionality being available and at least not without some additional hardware/software configurations. Has anyone implemented anything like this? If so, how'd you go about doing it?
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Two ways,  

    You could send an SMS / E-mail to all your contacts with a Wav file in it, or a short message to call (Number) for a voice mail from the CEO.   Did this one with an Asterisk Announcement for a group that was shutting down an offering and wnated to ensure that every user got the message.

     You could build an box like NewFies dialer and load a list of numbers to call and deliver a message to.

     http://www.newfies-dialer.org/

     Very long shot but many current systems of VM have a Blast option, you might be able to leave three messages one on each platform, but I doubt that will work for your cellular carriers.

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Commented:
Phonebuff,

Thanks for the information. That will certainly get me moving in the right direction. I've also been pointed towards Twilio as an option. Are you familiar with this service?
Yes, I am. But I have not used it before --