Intrinsically safe assembling telephone sets can operate in difficult industrial conditions at extensive humidity and high degree of dustiness. They have been designed particularly for the mine communication services supervising the tele-technical intrinsically safe networks. They may be connected to any intrinsically safe subscriber's telephone lines, including among others Devices of Intrinsically Safe Telephony UTI, local communication systems ITS, STG and LSTI-A, and Integrated System of Telephone and Dispatchers Emergency and Loudspeaking Communication STAR. The ITM telephone set enables checking the lines and equipment of intrinsically safe separation trough connecting with the telephone exchange, after entering any subscriber's line, as well as for receiving a calling signal by the use of optical and acoustic signaling device.

With any telephone exchange by the intermediary of intrinsically safe separation units ZSD, ZSB or ZSI with the subscriber's lines of STAR system.

Central from intrinsically safe separation units ZSD, ZSB or ZSI.