The port activity of the voice mail port. This value
is available to monitor port activity over time. The specific
value of this object is not as useful as monitoring for the
changing of this value. During normal operation this value
should change several times during a call. You can use this
value to watch for abnormal operation that might indicate a
problem with this voice mail port. For example, if you
monitor this value and do not detect a change in value for
a long time (like 60 minutes) it could be an indication of
a problem with that voice mail port. There are other
explanations as well so more investigation on the server
should be conducted before taking any action with the voice
mail port.