Tele-net engineers supplies various communication systems that are used in industrial plants for inter-plant communication. These are plant communication systems, public address systems, flameproof telephones, weatherproof telephones, etc. The products are certified for use in all hazardous and non-hazardous areas. They are used for voice communication in hostile environments where reliability, efficiency and safety are of prime importance. Plant communication systems and public address systems are used where paging with talk back is desired between the control room operator and the field operators. Loudspeakers and field station are provided at different locations throughout the plant. They all software controlled, state of-the-art technology with high flexibility and several unique features. Flameproof telephones and weatherproof telephones are required where use of normal telephones inside the plant is prohibited either due to safety regulation or due to environment conditions.