Thanks for the info bfrye, I have used a similar system using SMS (my personal cellphone hooks to the PC to broadcast SMS messages currently), but as you can imagine this isn't secure (plain text transmissions) and goes well over the 25 SMS's I can send free a month.
The method you're talking about sounds interesting, I did a quick bit of snooping and it looks like it may work. I will have to speak with our Service Providers and see what they think (I haven't seen anything like this offered in Canada yet... but then I might have overlooked something).
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