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Long DTMF/Short DTMF (During a Call : Menu
)
“Short DTMF” will be displayed when Long DTMF is currently active, and vice versa. Short DTMF plays key tones for 95 milliseconds per key press. Long DTMF mode enables to play tones continuously while a key is being pressed.
Earpiece/Speaker Volume ( During a call : Press
)
Adjust the Earpiece/Speaker Volume with 
during the call.
Adjusting Speaker On (During a Call : Press 
)
When during a call, active Speaker On press 
for 2
seconds.To cancel Speaker On, press 
for 2 seconds.
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