Go to Scheduling>Time Tracking>Views>Telephony Details
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Any lines that do not have a client assigned to them, are unsuccessful.  The purpose column will reflect the call was an attempted Arrival or Departure.  If the purpose column reflects "call", the caregiver did not successfully complete the process for the clock in/out.  From the Time Call column, you can see the time that the call was made and then assign that clock in/out to the appropriate schedule.