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User interface considerations are extremely important in the design of a programmed telephony application In this context, however, the user with whom we are principally concerned is the person at the other end of the call, not a computer user The person who is interacting with a programmed telephony application has a very limited interface: The person hears sound generated by the programmed telephony application The person can dial digits The person can speak As a result, designing the other-end interface presented by a programmed telephony application can be much more challenging than designing a visual interface for the CTI user, where it is much easier to provide feedback and many more options can be presented simultaneously This section presents a number of things to keep in mind when evaluating or building a programmed telephony application Consistency The most important consideration in user interface design, regardless of the context, is consistency A programmed telephony application should behave in a consistent fashion no matter where it might be in its logic flow This provides callers with a sense of security and reliability that makes them much more comfortable about interacting with an automated system Examples of consistency rules include: Reaching an operator A single digit should be reserved for reaching a live operator (if appropriate for the application in question) There should be just one value (typically it is ''0" or "*") used throughout the application If the caller presses the designated digit at any time (except perhaps in the middle of entering a multi-digit number), the call should be transferred to a designated operator If no operator is available, an appropriate message

int max(int a, int b); int main (void) { int x; x = max(10, 20); return 0; } int max(int a, int b) { return a>b a : b; }

All Wi-Fi standards share certain features, such as a wireless network card, special configuration software, and the capability to run in multiple styles of networks In addition, Wi-Fi implementations require a shared network name and channel for communication Each standard has a certain top speed and range of networking capability Finally, 80211 defines how transmissions work, so we ll look at frequencies of radio signals, transmission methods, and collision avoidance

the following assembly code file is produced The calling and returning sequences are indicated by comments beginning with asterisks added by the author As you can see, the calling and returning sequences amount to a sizable part of the program code

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should be played (For example, after hours on weeknights the message might say, "There is no one available to take your call at the moment Please leave a message and we'll return your call tomorrow") Reaching the main menu Most programmed telephony applications present a hierarchy of menus and allow callers to navigate by pressing digits that identify a desired choice The root of this hierarchy, the starting point, is referred to as the main menu A single digit may be reserved for returning to this main menu at any time If this feature is supported, the same key must be used throughout the program and the option must be available at all times Number entry format Programmed telephony applications often prompt callers to enter a number of some sort, such as a credit card number, account number, product number, etc The application should always use the same methodology for collecting a number from the caller The best approach generally is to use numbers that have fixed numbers of digits The prompts in these cases would say something along the lines of, "Please enter the six-digit account number now" The caller would then enter six digits (or a time-out would occur) Another methodology allows entry of a variable number of digits by using the "#" key to indicate the end of the sequence (This has become a de facto standard as a result of its use in paging systems) In this case the prompt would say something along the lines of, "Please enter the account number followed by the pound sign" All spoken prompts for a user to enter a number should be identical so as to reinforce that the same methodology is being used consistently The application might supplement this prompt with a tone (such as the bong tone)

The last, and most visible, part of any network is the software applications that use it If you want to copy a file residing on another system in your network, you need an application like Network in Windows Vista (or My Network Places in earlier versions of Windows) that enables you to access files on remote systems If you want to view Web pages, you need a Web browser like Internet Explorer or Mozilla Firefox The people who use a network experience it through an application A user who knows nothing about all the other parts of a network may still know how to open an e-mail application to retrieve mail (Figure 2-44)

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