IDA's new Model 21-28 VoIP Tone Panel (VTP) radio gateway product was designed and engineered to provide interconnect, control, and management functionalities to make your transition to a digital ecosystem easier and to ensure continued utilization of your well-established, optimally operating analog infrastructure. VTP facilitates seamless coexistence of both digital and analog worlds in an economical and user-friendly manner. VTP is manufactured at IDA’s new manufacturing facility in Fargo, N.D.