See also:

DTMF suffix dialing
DTMF suffix dialing can be used for gaining access to network services or for controlling devices, e.g., to make a remote inquiry of an answering machine. The DTMF code is needed for this purp ...

General information
1. Turn the controller: select letters or numbers. 2. Select additional letters or numbers if needed. 3. "OK": confirm the entry. ...

Switching the microphone to mute
When a call is active, the microphone can be muted. 1. "Telephone" 2. "Active calls" 3. "Microphone mute" A microphone that has been switched to mute is automatic ...