Wireless Intrecom working with ControlLogix

We are looking for a "wireless" intercom/phone system that will be able to tie into our AB ControlLogix PLC.

Basically, when there is an alarm, we need the PLC to make the intercom go off in multiple locations. All locations are line of sight. We can run power to them, but not data.

Any thoughts?

Take a look at this. We have used it for remote pump control so it should work for what you want to do. I didn't do the purchasing so I'm not sure of the cost.

http://www.elprotech.com/index.cfm?titleID=75&content=265&sub=88