You can get the bill on the present date. The new billings of your VoIP services are based on your calling rates. The billing is based on the present rates so that you should get bill on the present rate to get the services on the bases of the present condition. The bill is based on the present call rate effective on the defined date. VoIP billing rates are based on the terms to get aware about the terms.
I think many VoIP service providers provide the services on the bases of the Regulatory Recovery Fees. It is an additional fee you need to pay for getting the services on the bases of the charges to make use of the services. You can make charges to get the additional cost to take care of it. It is applicable to make as per the federal tax changes to take care of it. You must have to get the bill based on the defined terms to make changes. You need to pay additional cost on the bases of the cost of the federal taxes to make the payment on the bases of the percentage of regulatory recovery fees to get proper coverage.