Abstract: A dealing communication terminal apparatus of a pagination type is enabled to accommodate at least one communication terminal apparatus, public lines and private lines and to connect exchangingly them. The communication terminal apparatus 300 comprises a color display device 101 for displaying the names of lines, auto dial other property, and functions, a line key panel 102 laminated on the display device 101 and provided with button portions opposite to the line name indication portion of the display device 101, and a main control device 303 and a display control device 304 exchangingly for displaying a plurality of line button accommodation screens or function button accommodation screens in the display device 101 by operations of the fixed function buttons 103A, 103B, each provided in the communication terminal apparatus.

Abstract: A trading communication system. A line control unit includes a channel switch circuit, a number of line trunks connected to the channel switch circuit and adapted to be connected to a line network, and a number of line circuits connected to the channel switch circuit. A number of first terminal adaptors are connected to the line circuits. Some of the first terminal adaptors are adapted to be connected to a commercial switched circuit, while one of the first trading call terminals is connected to one of the first terminal adapters. A number of second trading call terminals are at locations remote from the line control unit. A number of second terminal adaptors are connected to the second trading call terminals and are adapted to be connected to the commercial switched circuit to connect the channel switch circuit to the second trading call terminals.

Abstract: A trading telephone unit of a trading telephone system includes three display devices and control keys on the trading telephone unit. A first display device is provided at an upper left side of the unit having a function keyboard and a ten-key keyboard provided thereunder. On the right side of the unit, two display devices are provided in parallel with one of the two display devices being a second display device having, for example, twenty line selecting keys and a third display device having fifteen line selecting keys and four incoming line selecting keys, thereby enabling the unit to indicate thirty-five lines at once. The trading telephone includes pagenation memory having, for example, ten pages of memory with each page carrying thirty-five line names and dialing numbers.