Your “Service Period” charge includes your plan, and is billed one month in advance.
Your “Usage Period” charge is calculated at the end of each billing cycle and includes additional usage if applicable.
Charges that appear under this heading represent recurring charges and include your answering service, and other features you have subscribed.
Each answering service plan includes a usage allowance. This usage allowance is the number of minutes that are included with your service plan. If the allowance is exceeded additional charges would apply.
Other Charges & Credits include any prorated, setup fees, etc., and credits if applicable.
A one-time setup charge is applied for the implementation of your answering services account. It includes, scripting, programming, custom greeting, and phone number assignment, etc, etc.
Most clients sign up for answering service after the periodic billing cycle has been closed. If you see a “Prorate” charge, then your service had started in between a billing cycle. This results in providing you with a partial service period. In order to provide service during this partial period a prorated charge will appear on your invoice.