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In what manners would the bluetooth kit be able to provide that data?

I think the idea would be to have an application listening on the serial port of the Empeg, which would be connected to one of these AirCable Bluetooth Adapters. A Bluetooth phone would be paired to this adapter, and an application on the phone would send Caller ID info over this link to the Empeg in a format which it can handle and display.
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Hussein