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We turn now to looking at how actual telephony products and services are implemented and how they implement the functionality we have explored The concrete examples provided in this chapter breathe more life into the concepts and abstractions presented earlier Each individual telephony product is a set of telephony resources that goes into a telephone system Telephone systems are generally subsystems of a larger telephone system, and virtually all telephone systems are ultimately connected to, and thus are part of, the worldwide telephone network (the PSTN) This chapter is a buyer's guide of sorts It deals with the wide array of telephony equipment and services available to anyone building or updating a telephone system We'll look at the various product categories and the factors to consider when comparing alternatives Telephony product categories include conventional CPE switches and switch peripherals including, telephone stations and peripherals, media servers and gateways, and IP telephone systems The chapter concludes with a discussion of the service offerings from traditional carriers and a new generation of telephony service providers

Figure 11-3

The div( ) function returns the quotient and the remainder of the operation numerator/denominator in a structure of type div_t The structure type div_t has these two fields:

.

The alternative is a stream cipher, which takes a single bit at a time and encrypts onthe-fly (Figure 11-4) Stream ciphers are very popular whenever your data comes in long streams (such as with older wireless networks or cell phones)

int quot; /* quotient */ int rem; /* remainder */

This program displays the quotient and remainder of 10/3:

101010010101101010010010

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Assembling or upgrading a telephone system, whether it be for your company, for a client, or for your own home or business, involves combining a number of different telephony products and services to satisfy your unique requirements Figure 10-1 depicts a complete telephone system At the center of the system is a CPE telephone switch which forms the hub of this private telephone network In addition to the telephone stations and telephone station peripherals which the switch provides service to, there are a variety of computer telephony client and server products and other peripheral devices that enhance the functionality provided by the switch The telephone system is connected to one or more external networks either directly or through gateway products External Networks If you are assembling a new telephone system, or are assessing your existing system, one of the most important steps is to determine what services you want to obtain from public carriers or other telephony service providers and what services you want to implement using hardware and software that you deploy yourself The functionality of your telephone system (whether it is as small as just a single telephone or as large as a collection of switches forming a global private network) will be a combination of the features and services built into your telephony equipment and the telephony features and services that you subscribe to At a minimum you'll need a service provider for access to local calls and a carrier for long distance calls However, shopping for telephone service is no longer just a question of calling your local telephone company Choices include competitive local exchange carriers (CLECs), cable TV operators, utility companies, Internet service providers (ISPs), and more Most of these telephony service providers offer features and services that go well beyond basic access to the PSTN.

#include <stdlibh> #include <stdioh> int main(void) { div_t n; n = div(10, 3);

Figure 11-4

printf("Quotient and remainder: %d %d\n", nquot, nrem); return 0; }

Selecting the appropriate mix of products and services is a basic "buy versus rent" question You will need to weigh the cost of acquiring and maintaining telephone system equipment against the cost and reduced flexibility of subscribing to comparable services You should investigate all the subscription options available before deciding on a particular implementation strategy and keep these trade-offs in mind throughout your evaluation and planning process

#include <:stdlibh> void exit(int exit_code);

The granddaddy of all TCP/IP symmetric-key algorithms is the Data Encryption Standard (DES) DES was developed by the United States government in the late 1970s and was in widespread use in a variety of TCP/IP applications DES used a 64-bit block and a 56-bit key Over time, the 56-bit key made DES susceptible to brute-force attacks

The exit( ) function causes immediate, normal termination of a program This means that termination functions registered by atexit( ) are called, and any open files are flushed and closed The value of exit_code is passed to the calling process usually the operating system if the environment supports it By convention, if the value of exit_code is zero, or EXIT_SUCCESS, normal program termination is assumed A nonzero value, or EXIT_FAILURE, is used to indicate an implementation-defined error Example This function performs menu selection for a mailing list program If Q is selected, the program is terminated

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