Lexicomm Vilx-OSR roaming portable fire telephones are used in conjunction with jack points ; primarily for use by the fire service in a high rise building to provide clear communications between the control point and the fire fighters, as radio systems may not work. The roaming fire telephones are easy to use. To initiate a call , a telephone is plugged into the jack point which initiates a call to the master station. Full duplex operation provides clear 2-way conversation.

The Lexicomm EVCS system allows up to 5 telephones connected to the same line to have a “party Line” conversation with the master station at the same time.