Screenshot showing all the CDRs from a particular month and year for a VoIP carrier:

The screenshot below shows that if the inbound/outbound minutes tag (usually a phone number/CLI or SIP trunk ID) is not asscoicated with a customer in YAP then a red warning displays stating "NO CUSTOMER" and the minutes will not be billed:

To add a inbound/outbound minutes tag in YAP go to the invoice page and select either "Inbound Minutes Tag ✎" or "Outbound Minutes Tag ✎" and insert the customers tag from the CDR (usually the phone number/CLI or SIP Trunk ID) into "Enter Item Tag":

The invoice page shows a inbound/outbound minutes tag as a invoice item. It will always be set to "Bill Item Once: no", "Item on Hold: no", "Item Type: Services" and "Supplier Contract Length: BLANK" regardless of the options selected while creating the minutes tag: