This option can be used to turn off the ringer for all calls. If set to no ring, this disables both the phone's audible alerting and visual alerting.

1.Press the Features soft key if shown. To do this during a call, press the key phone PHONE key and then press the Features soft key.
2.Use the up arrow up and down down arrow arrow keys to highlight Call Settings. Press Select.
3.Use the up arrow up and down down arrow arrow keys to highlight Disable Ringer.
4.Press the Change soft key to change the setting. Selecting On will turn the ringer off.