This MIB module  provides management of voice tone
signal as static injected tone for Land Mobile Radio
The tone signal includes tone, pause, guard/idle tone.
User can configure a sequence of tone and pause to
be played out before any voice sample is played out.
These tones are used to wake up the radio and 
select the radio channel. During the voice playout,
a configured guard tone will be mixed with the voice
to keep the radio active. For some radio systems, 
there is no need for the guard tone, but a configured
idle tone is needed  to inform the radio that the
channel is idle. It is possible that the radio system
will generate guard/idle tone.  In that case,
the IOS can instruct the DSP to filter out the radio
generated guard/idle tone by enabling digital filter. 
Digital filter is able to filter out either 1950HZ or
2175HZ tone.