Congratulation KNTECH vandal proof VoIP telephone won the tender of El Salvador prison.
Robust anti vandal cold-rolled material and armored cable to make it good protection.
This jail phone has LCD display and its working temperature is -30 degree to +75 degree.
With SIP 2.0 protocol, our prison telephone is compatible with many IP PBX. With professional R&D team, we support customization in both hardware and software.