Select on Reconcile orders from the main screen see below
Enter your start/end date and select on RECONCILE. Then select one of the following from the bottom
All Calls/Successful Calls - This will show all Calls that have been synced successfully
Failed Calls - This will show calls that failed to sync. In this situation you need to RESEND each of these by holding down on each call and selecting RESEND ORDER
Once you have done this, select on SYNC to resend the Calls.