Greeting from the IRS will be followed with language preferences selection (for English press 1, for Spanish - 2).
IRS phone services usually will have long waiting time and the calls will be answered in the order received. The prerecorded voice will suggest to visit their website to make a payment or setup a payment plan, check on your refund, etc.
After office hours: automated touch tone services are available. You may get answers about filed tax return and refunds expected. Other options available, but they frequently change. You may also opt to receive prerecorded information, for example about healthcare.gov and its benefits for your family.