...
Navigate to Logs.
The Logs page will be displayed.
Select the Call Forward option from the Actions drop down list.
The call forward list will be displayed.
Here you can see the phone number that called, when they called, and how long the call lasted in the call duration field.
It’s important to note that 2 voice credits will be deducted for each minute since the gateways charge per minute for 2 legs of the call, an inbound leg from the caller to your number and an outbound leg from your number to the number you are forwarding the call to. Each leg is billed separately on a per-minute basis and therefore 2 voice credits will be charged for each minute.
In the above example, the call duration is 1 minute and 29 seconds. Therefore, 2 voice credits will have been deducted for that call.