11. Terminal equipment

11.1 ISDN telephone

Several types of digital telephone (TTN) have been developed. Depending on the model, these telephones can offer additional facilities based on ISDN-specific functions, making them far more comfortable to use than conventional analog telephones.

ISDN telephone terminals can be considered high-end telephones. Depending on the case, they feature an LCD display, function keys, programmable keys, alphanumeric keypad, direct call keys, loudspeaker, hands-free facility; they may also offer programming facilities: personal directory, call log, sending and receiving alphanumeric messages, password management, etc. A complete range, from the simplest to the most sophisticated, is available on the international market today. A complete range, from...