The new AMDEX Lineman’s Test Phone has been designed in Australia for use by installers, repair technicians and other authorized personnel to enable line testing and temporary communications. Providing DTMF output only and being line-powered no internal batteries are required. A unique 20dB “BOOST”button, when switched on, allows the user to set aside the phone and still hear dail tone, speech etc. The “BOOST”function does not work on monitor mode. This model does not have a speaker phone facility.