It means that you will need to call the voice authorization center to complete the sale. The voice authorization center will assist you in obtaining an authorization code for the transaction you are trying to run. Please make sure to have your merchant number ready when you call. Once you have obtained the authorization code, you will need to perform a “Ticket Only” transaction and obtain an imprint of the credit card.
The numbers to call are:
Visa MasterCard Authorization Center: 800.228.1122
American Express: 800.528.2121
Discover: 800.347.2000