Avaya one-X 1603 - Adjusting the brightness or contrast of the display; Changing the ring pattern; Turning button click sounds on and off; Turning error tones on or off

Introduction
12 Avaya one-X™ Deskphone Value Edition 1600 Series IP Telephones Administrator Guide Release 1.0
See Appendix B: Related Documentation for a list of non-Avaya documents, such as those
published by the Internet Engineering Task Force (IETF) and the International
Telecommunication Union (ITU).