This object indicates the duration to play the
announcement for one cycle, it is applicable only for the
fixed announcement play.
This object is used only when the Play Announcement signal
from the MGC does not include a 'cannoAudioFileDuration'
parameter.
For the fixed announcement play, the 'cannoAudioFilePlayNoc'
and the 'cannoAudioFileDuration' are used together to
determine how long the announcement is to be played.
The value zero indicates that this is a variable announcement
play and only the 'cannoAudioFilePlayNoc' is used to determine
the play time.