The combination of phone number lookups, along with Internet access, was offered by some service providers VoIP (Voice over IP) was an additional feature. īoth provide a reverse lookup feature (by phone number or by address), albeit involving up to five CD-ROMs. These were not a matter of a single click: PhoneDisc, depending on the mix of Residential, Business or both, involved up to eight CD-ROMs. Selectphone (ProCD) Inc.) and PhoneDisc (Digital Directory Assistance Inc) were among the earliest such products. Printed directories were usually supplied free of charge. In many countries directories are both published in book form and also available over the Internet. In the latter case, the directory can be on physical media such as CD-ROM, or using an online service through proprietary terminals or over the Internet. Telephone directories can be published in hard copy or in electronic form. įurther information on the American bilingual business telephone directory: Rafu Telephone Guide Publication Other colors may have other meanings for example, information on government agencies is often printed on blue pages or green pages. (These listings are often published separately, in a city directory, or under another name, for a price, and made available to commercial and government agencies.)
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