Short calls , above 1 sec will have a cost.
To not show these calls a Filter can be setup under the
[Setup > Properties > Filers and Defaults].
Topaz will subtract the filter period from the duration
of the call and write this new duration as the call duration.
Any short calls will in essence fall away now. Calls that
still show a short duration are calls that have had the
durations modified and was still short.
E.g.
I setup a filter of 10 Sec on Cellular Calls.
A 1 minute 1 second call is made. The duration will now be
modified to reflect a 51 second call. [61 - 10 = 51]
This will make sure that your costs are a bit lower than
normal (for Topaz), but closer to reality.