Globalsat Technology GTV-580 - Manual (Page 32)

32
Talking mode
Press this button to
mute your voice.
The other party
could not hear your
voice. Tap it again
to resume.
Press this
button to hang
up the phone.
Press this button to
show the extension
number input
screen.
Press this
button to
switch calling
source between
cell phone and
GTV-580.