ON is the period of ringing (“On time” in ‘ms’) while OFF is the period of 
silence. In order to set a continuous ring, OFF should be zero. Otherwise 
it will ring ON ms and a pause of OFF ms and then repeat the pattern. Up 
to three cadences are supported. 
When headset is connected to the phone, users could use the HEADSET 
button in "Default Mode" or "Toggle Headset/Speaker". 
 
  Default Mode: 
  When the phone is in idle, press HEADSET button to off hook 
the phone and make calls by using headset. Headset icon will 
display on the screen in dialing/talking status. 
  When there is an incoming call, press HEADSET button to pick 
up the call using headset. 
  When  there  is  an  active  call  using  headset,  press  HEADSET 
button to hang up the call. 
  When Speaker/Handset  is  being  used in  dialing/talking  status, 
press HEADSET button to switch to headset. Press it again to 
hang up the call. Or press speaker/Handset to switch back to the 
previous mode. 
 
  Toggle Headst/Speaker: 
  When the phone is in idle, press HEADSET button to switch to 
Headset mode. The headset icon will display on the left side of 
the screen. In this mode, if pressing Speaker button or Line key 
to off hook the phone, headset will be used. 
  When there is an active call, press HEADSET button to toggle 
between Headset and Speaker. 
Configures to enable or disable the speaker to ring when headset is used 
on "Toggle Headset/Speaker" mode. If set to "Yes", when the phone is in 
Headset "Toggle Headset/Speaker" mode, both headset and speaker will 
ring on incoming call. The default setting is "No".