 the use of an Audio Menu system. This system prompts the caller through a list of choices and allows the caller to select one of the documents based upon an audio description. A typical call scenario would go as follows: Caller dials the telephone number. "Good afternoon. Thank you for calling CMP Books. If you know the extension of the party you are calling, you may dial it now. For a catalog of our telecommu- nications and computer telephony books, press 7." " Caller presses 7. "For a list of books on telephone systems, press 1. For books on transmission and cabling, press 2. For IP telephony books, press 3. Caller presses 1. "For books on small systems, press 1. For books on large systems over 200 lines, press 2. All other requests, press 0 now and an operator will be with you shortly." Caller presses 1. "Please enter the telephone number of your fax ma- chine, followed by a pound sign." " The Telecom Handbook o 189 FAX SERVERS Caller enters the telephone number of the fax machine where he wishes to have the fax sent. "To identify your fax, enter your extension number or telephone number, followed by a pound sign." Caller enters the telephone number of the fax machine where she wishes to have the fax sent, followed by a pound sign. "The number you entered was [System repeats the entered telephone number]. If this is correct, press 1. Otherwise, press 9. " Caller presses 1. "Your fax will be delivered shortly. Fax-on-Demand transmits the requested fax containing the product information to the fax machine at the entered tele- phone number. The document will have a cover sheet that identifies the recipient of the fax as the person with the exten- sion number or telephone number that the caller enters when requesting the fax. The use of Audio Menus has advantages and disadvantages: ADVANTAGE: Simple for first-time callers to use. Callers have no need to know a document's number. Following the audio menus is straightforward. DISADVANTAGES: Not suited for a large selection of documents. With a large number of docum