When you open Voice Analytics, go to "Reports > By Month".
You will see a graph and a report.
Here is an explanation of the terms:
Incoming Calls: Calls that are arriving on our IVR platform.
Transfer: A call has arrived at our IVR and is being transferred to you
Notification: Outgoing calls
Routing: a call comes in and is automatically routed to another number (deprecated, is replace by an "Incoming + Transfer". Routing will eventually disappear from this report)
To get a better understanding of the terms, here is a schema that shows which is which: