I am not able to connect to my conference call line, I am getting a busy signal. Please help?

I would like to apologize for any inconvenience this may have caused you. You may use our back-up number 781-xxx-xxxx, if you or your participants are having any issues connecting to the conference line. These numbers are available 24/7. When you call the back-up number, the system will prompt you to enter your conference dial-in number, and access code. If you are the host, you will need to type in the host pin code.