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Hold Single: Make the current call hold.
End Single: End the current call.
New call: Enter new dialing interface.
Phone book: Enter Phone book menu.
Messages: Enter Short message menu. Owing to
restriction of network engagement, MMS function is barred
during call process.
Sound Recorder: Record the current call.
Background sound: Setup the background sound for the
current calling.
Voice inflexion: Setup voice changer for the current dial.
Change Voice: Setup Voice Changer for the current dial.
Mute: On selecting silence during a incoming call, the
ringer will be muted.
