This circuit functions as a practical multi-channel cable Telephone. It includes a host, and can be installed anywhere for the usage of several extensions.It can be used uat niversities student apartments, guest houses and other places. It can call upto a distance of about 300m. Master control room should be installed in the center. It can also be used in offices, guard room, duty room, etc., which helps to talk with the extension, where else, extension installed in the studio. When the host gets connected with any extension, the extension can talk to each other with the host.