The Premier Technologies RUF2700
The RUF2700 loads over a phone line, and is designed specifically for advertising on hold. New programs are loaded remotely (by us) by dialing into the machine and playing the new program over the phone line, which the RUF2700 records into Flash memory and then repeats with no moving parts.
Loss of power to the unit will not erase a production because it uses Flash memory to store the audio file. The unit can either be placed on a dedicated phone line or share a line with a fax machine.